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Check your household insurance you may be covered my insurance would cover me in that event funny I only checked that today I hope your covered regards from Liverpool
We've had plenty of those days when nothing goes well and you either have to cry or just laugh. The insulation test was interesting. We used the same stuff on our engine room hatches, then a layer of 10 mm rubber over the entire saloon floor and finally carpet. Obviously a different set-up to yours, but those extra two layers made a MASSIVE difference for the noise while underway. We can easily talk to each other where before you had to shout.
What I see as an agricultural engineer who has sound dampened engines and pumps, is that you are seeing the effect of sound sources. At low speeds, like ideal, the main sounds are from the engine. Remember sounds are waves, so you are picking up a diverse sounds traveling through different pathway. Ie exhaust noise some of which travels through air before encountering your hull and deck and others which travels directly through material. As the boat, rpm’s go up, there will be more and more hull noises contributing to sound along with the engine sound. At high speeds, the hull noises contribute more damping the effect of the engine. I have seen pump stations where the sound is water through the outfall pipes drawn out the engine/ gear drive is the pumps. Fun side effects, in my opinion.
I had the same type of set up in my boat, in addition to the insulation inside the engine compartment I had an upholstery shop make me a piece of water proof carpet that would cover the floor, it snapped in so I could take it out when I wanted to clean or do some messy fishing. This made a huge difference.
yeah some sort of mat on the top of the floor would be a good idea as the surface is hard and sorta shiny so it would reflect sound and a mat would dampen any soundwaves that do escape from the inside.
If you want the sound insulation to have any impact you need Halyard insulation 50 mm with lead barrier, foam and foil. You also need to do the engine side walls and to add seals to the hatch lifts then you will get a good result!
Just buy some 'stable mats'. It's a heavy rubber mat used for horse trailers and cow stables, use at least 8mm thick. Place it over the motor covers, you can roll it up easy for motor maintenance. It will get rid of all the sound escaping from leaks in your floor. And the weight helps deadening the sound very much. It is also very safe when you are in bad weather, you won't skid.
I have not read all the comments but anything over 85 dB you should be wearing ear defenders especially for prolonged trips. Don't put a big magnet near anything electronic unless you want to make things worse. See if you can get electrical insulation rubber matting to put on the floor. Easy to fit and easy to keep clean.
You could try adding butyl first to reduce resonance, mass loaded vinyl to absorb frequencies and both closed cell foam and the open cell foam you used. This will help manage noise across a broader range of frequencies. Doing more of the deck and surrounding structure will also make a difference.
just for your info , for every 3 db rise it is double the level so 40db to 43 x2 43 to 46 x2 You can listen to sounds at 70 dBA or lower for as long as you want. Sounds at 85 dBA can lead to hearing loss if you listen to them for more than 8 hours at a time. Sounds over 85 dBa can damage your hearing faster. The safe listening time is cut in half for every 3-dB rise in noise levels over 85 dBA. above is a google search result for max safe db level
Insulating the hatches is a great start, but you need to insulate the entire engine compartment. Roof and walls, otherwise sound will come through other areas.
Soft insulation is usually best for absorbing higher frequencies, but the main thing that affects lower frequencies is just plain mass. If you could make a second layer of deck that sat on top of the floor, that would probably help. The other thing might be to make sure the hatches are sealing - a good gasket to make sure vibrations can’t get through air gaps (easier) without going through the deck. Also making sure any penetrations into the cabin or deck area (e.g. for cables etc.) are sealed up properly.
You just proved the sound insulation you put in was effective at lower frequencies you need some thin lead sheet in conjunction with the insulation material. You basically need mass. BUT you need to tackle the whole deckhead of the engine room and the sides of the boat too (not always practical with the machinery installed).
What great idea. I am imagining a little yellow life preserver. Drone drops into the water, pop inflated drone life preserver makes it in a small hover craft.
Nice job on re-insulting the hatches and taking us along on that adventure! I did note some other comments-but I think that they didn’t appreciate that you guys are not sponsored for this boat/ship. I agree with others about getting floor covers to assist in reducing the noise - the EVA Foam boat decking is a good choice - nice on feet, not slippery and waterproof.
Looks like a lovely day to be on the water. The winter breeze must be chilly at 50 something north. You make it fun and informative whatever the season.
Seeing the background made me miss home. That's where my love for boats started. Lived in Bethesda mostly of my junior life, then Bangor, Caernarfon, Anglesey too. Now in East Midlands for now. Keep the good work up. Learning something everyday.
😂😂😂 Simon: …you know what the most remarkable thing on this boat is? the whiteboard. Hilarious! John Cleese or Mel Brooks couldn’t have come up with a better one-liner! Keep up the great content.
If you have the drone insurance with DJI it allows you 1 or 2 drones if you lose your drone look at your insurance DJI care have just introduced fly away cover if you've only bought it recently
Sorry about the lost drone. Good job trying to improve your noise issue. I have done a few projects at work (5+ years ago) to reduce the sound levels on production equipment. They were difficult projects but very rewarding. One of the things I found was frequency was very important to pick out the right sound damping material. Once we know the major frequencies, we than picked out insulation that was appropriate for the primary frequency(s). Our vendors told us Low Frequency is very difficult to dampen. High Frequency is fairly easy to dampen, of course we had a lot in the mid-range too. What might help is the laminated material; foil, foam, dense rubber like material, foam, adhesive. The dense material will block more of the high frequency sound waves. We used about 6 different materials, including the one that looked just like what you used. Hopefully insulating the other areas will greatly improve the sound levels.
Shape also comes into play too, in sound proofed rooms they use triangles at 90* turns to each other so it breaks up the sound waves instead of reflecting off a flat surface. Even simple at home sound dampening can be done with egg cartons.
Gemma, you should be covered by your insurance, you just have to prove where you lost it. It’s not your fault it was a faulty drone . The insurance will want to know where it was lost and the coordinates. Plus the video of it going in the water. I wish you all the best, love your videos. ❤️❤️ Roy
Many many years ago in fact more than 50years I built a small speed boat powered by a 1500cc petrol engine mounted directly on the bearers the propshaft thrust was taken by the rear gearbox bearing . To try and reduce noise I change the instalation I mounted the engine on fairly "Soft" mounts and mounted a thrust bearing on a seperate frame fixed to the engine bearers and used a short double UJ shaft to connect the shaft to the engine . The boat was trans formed !!! So much Quieter. Most engines appear to be mounted on fairly " Hard" Mountings therefore transmitting vibration and noise to the hull. The whole hull of a boat acts as a sound board!! The only problem is this takes up more room but does not require as accurate lining up of Prop Shaft !!
@@Dave5843-d9m Agreed!! Ideally for road work UJ's should be running between 2 to 5 degrees, beyond 5 degrees UJs will overheat causing quicker wear and vibrations can become an issue.If installed perfectle straight they wont last as long because as you said the grease wont move around
Every 3 decibels increase is double the sound... it's called an exponential scale eg 6db is twice as noisy as 3db. 100db is 4 times as noisy as 94db - hope this helps 🙂
@@ShipHappensAdventures Another thing watching the video, the distance you hold the meter is critical to the measurement - really to get a good reading you should mount it on a tripod or something to maintain your distance... very interesting though (sorry about the drone 😞)
Well yes *and* no. "double the sound" and "noisy" doesn't make sense without a subjective scale to plot it on... and while the dB scale isn't perfect in that regard, it's pretty OK.
You are well into ear defenders territory there, I put 30mm closed foam under my hatch and it did make a difference but it was still flipping loud at 25 knots. Very jealous of you guys, I had some great times at Conwy Marina
Nice work, idling up to the 'mooring ball'. Sound reading is part science and part art. Point the microphone in a different direction and you can drastically-change the level of sound recorded. But yeah, 8 dB is really nice savings. I feel your pain on the drone. I got our DJI wrapped up in tree branches, and it freaked out and bounced off the roof of the house, landing in the yard. While damaged, and I had to put the old props back on, it still works. But yeah, the DJIs sometimes do silly thing trying to be 'smarter' than you are.
Great vlog guys, very interesting. Anything over 85db’s needs ear protection if over long periods. I would tend to buy some radio ear sets and tune into Radio Caroline. LOL. Its a pleasure craft enjoy it. Sad about the drone, hope you can recover something from insurance. Stay well.
The point about trying different locations in the boat for measuring sound is a good one, the 1 place it counts is the level that your ears are at. I thing that carpeting the floor would make a huge difference in the amount of sound inside the boat. I am picturing the sound bouncing back and forth from the floor to the ceiling and back. Carpeting would absorb the sound instead of reflecting it.
If you can't win the day even for the cost of 1000 quid, you got to laugh.😂😂😂 What else you gonna do, cry?😢 Quite the day you had.🎉 Wonderful to see you getting out there.❤
In Canada any noise over 85db requires hearing protection . My boat has similar sound ranges as yours and we all wear ear muff type hearing protection above 1200 rpm that I keep in side pocket of cockpit . Will consider trying the stable mats previously suggested. Thanks
A friend of mine with the same boat keeps large fenders stored outside of the engines and it makes a huge noise reduction. A lot of noise comes up the sides of the engine room, not just through the deck.
Great content today ,boat runs fines .insolation not bad in the area where throttle is try car deadening foil I think it's only 6 mm but has good affect.
Boujour de France. I also isolated the engine of my 1978 speedboat a Perkins 4108 which before the work forced me a navigation with protections in the ears. I did some research and as you opt for a small price, which did not work. I resumed with an industrial product that consists of three layers: a hard layer, an absorbent layer and another hard layer (caouthcuouc). The price is high but the result is spectacular. I think the noise reduction is in the range of 60% to 70%.
@@davesmith60 This is a translation mistake and is an internal engine in a Freeman 24. The engine is inside the house and I confirm the 60% noise reduction.
25:06 those results show around 3dB reduction at the lower speeds and about 6 or 7 at high end… that’s a reduction to half the noise level and about a quarter at the high revs… I know you may be thinking well it doesn’t sound like half or a quarter of the noise but that’s because I mentioned in my earlier comment that the dB scale is non linear it’s what’s called logarithmic. If you had used a linear device the. It would clearly give you readings that showed half or a quarter of the sound level
The air intake on my diesel car has damping chambers on the side of the air inlet feed pipe. Running without that pipe is considerably louder. I think you will need your look into some harmonics science for the air intakes. Check out the Fiat Panda or 500 1.4 litre.
It would only take ONE motor to fail on the drone, and it will crash land .....As you proved!! Beware using drones at sea, slight salt contamination will see them dead!!! (in the water) - Very interesting video (and the most expensive you will ever make) all the same!! John
Well it can, but if engine seals around hatches etc are not good, it will be all for nowt. Decibels. An increase of 3dB is twice as much, -3dB is half as much. plus 10dB is ten times as much. Decibels are a Logarithmic scale as opposed to as LInear scale, we use it because it better represents changes in power (volume) than a linear scale could in respect to the human ear (0dBA being the threshold of what most people could hear and anything from 85-140dB considered harmful, 140dB very harmful 🙂)
Interesting video. After the drone went into the water I was thinking maybe its time for a new adventure, SCUBA diving!!! I bet you would get lots of stuff diving and magnet fishing :) keep up the good work
Simon you have massive spring tides coming up around 2nd weekend in February the 12th I think is highest but a few days either side will also be good , but watch the shifting sands
G'day Gem nice to see out from under the accounts. G'day Richard, nice to seeya. Insurance Company? You were talking about footage show it to the manufacturer and insurance companies, and get another drone. Thanks m8s, that was a good one. Sound insulation is important, but it also traps heat a bit. Nice goin m8s, done well, thanks Richard.
It might be helpful to try automotive sound deadening sheets on the side walls and other portions of the engine compartment roof if you can get it. That stuff is basically real heavy and adhesive so it cuts down on the vibration of the wall/roof panels themselves reducing the sound that can get through. (Getting physical access would probably be the worst part.)
The sound you measure might not be all direct engine sound, but also resonances. That could be why the amount of dampning changes with rpms. like it's fairly common for cars to have an annoying exhaust drone at around 2000 rpms, when people have added some kind of sports exhaust.
2000 rpm is probably where the engine's are at their best point of balance. Adding sound insulation to the tank walls where possible will help when the tanks are getting empty, reduce the empty vessel's make most sound effect. Have you figured out why the port rev counter is inactive till about 2000 rpm?
Did you check on drone assist that it was ok to fly in that location as if you was in a no fly zone it can take off then land as it’s not allowed to fly just a thought DJI have it built in
As others have said the whole engine compartment needs insulating. You need insulation with some sort of heavy solid barrier in the foam. How good are the engine mufflers? How good are the engine anti vibration mounts? Are they old and hard? You kind of need to work out where the sound is getting through and stop it. The edges of the hatches maybe a big problem. It’s unfortunate there is not much clearance between the top of the engine and deck. 100db is too loud and dangerous to your hearing. 85db is considered safe. Every 3 dB is a doubling of noise power. So if you drop the noise measurement by 3db you have halved the noise power. I don’t think you need to do anymore multiple speed trials to test the insulation. Just work to get the engine idle level noise down and that reduction will carry through to the higher engine rev noise levels. Good luck
Thing is with a boat like that you mostly hear exhaust tones, which are marvelous by the way. You should put back some of the insulation, just cut out a round hole just big enough
Another great video guys and super fun. You didn't seem to notice that engine noise increased depending on the load met due to current and wave action at the set revs as well as the fact that the noise directly from the exhaust overtook the engine noise at higher revs. Perhaps this occurred at the level that was the same for all the tests. So sorry that the aircraft failed and is lost, but stick to boats and you'll be OK!
Fun to watch. You didn't have a layer of mass loaded vinyl in the insulation, which is supposed to make a big difference. Maybe you can get a vendor to sponsor you to compare theirs against this stuff. And they say gasketing makes a huge difference. But in your scenario, in the end, a layer of carpet on top of MLV may be the best solution of all.
sorry for the lost drone, I hope your insurance covers it for you, this summer you should have some fun on her, fishing in offshore deep water, if that's you thing of coarse, If I was you I would buy some charts and see likely fish holding areas, like wrecks, reefs, gulley's, etc., Be safe and have a good time.
One thing I thought about is that in the first idel test, you put the meter on the floor, but all others you hold it in your hand a bit above the floor. Wouldnt that give different readings?
My brother who’s no longer with us as a fisherman called the “white caps” white horses depending on how bad they were to go out with his steel hull boat
Maybe 2000rpm is the boats sweetspot that it resonates at where the whole boat is acoustically in harmony with the engine. Maybe look at the engine mounts to see if they need replacing?
I'm a lorry driver,and when some is overtaking and you get level with each other,there is a harmonizing noise with both engines side by side ,you hear on twin engine aircraft when their engines are running slightly out of sinque I think that's why it's 96 with all three tests
Was it just me, or was the initial test with the meter on the floor, but without the insulation it was handheld? Would it matter? I'm gonna go watch again.
I speculate that there will be a particular RPM where the hull resonates at the same frequency as the shafts vibrate at, so at that RPM the majority of the sound won't be coming from the engine bay. That could be 2000rpm on your boat?
Remember one part of your sound (DB) readings is caused by vibration. Vibration is different at different RPM's. and this is transmitted throughout the hull causing sound. I think you said at 2000 RPM the DB readings were the same. I would possibly call this the resident frequency.
Would you be able to travel to Europe and the Med in that boat or would the fuel costs be prohibitive? I’m used to seeing people going any distance on sailboats but I’m just wondering if you intend to travel on it?
Great videos as usual, thanks. I was especially keen to see your sound level results as I've had little success with my sound insulation. I added insulation to previous boat and tested in all cabin spaces and it made zero difference anywhere. One thing I'm suspicious of are the engine mounts. The engines have solid mounts and I'm guessing therefore the whole boat radiates noise regardless of any insulation. I haven't made changes to latest boat (also with solid engine mounts) as I assume the same results. I'm guessing fitting rubber mounts would require also fitting UJs to the prop shafts. As your insulation made a difference, I assuming your engines are on rubber mounts and you have UJs? What does anyone reckon?
Sound dampening acts like water leaks through cracks and seams. You will get better results with adding weight like lead vynil, and close cell foam used is soundproofing. Seal all seems with lead vynil sheets.
Can you not get an emergency floatation device you can attach to a drone? May be a wise precaution when using around water? Edit, there are floatation devices for DJI Drones, i think they are meant for taking off on water but they will also stop your drone becoming a Sunmarine.
You have no chance of locating the drone. The current on the River Conwy moves stuff around. I have dived there numerous times looking for lost item and only very rarely is stuff found. Good luck though. 👍🍀
Could the exhaust noise be transferred? At 2k maybe that’s the harmonic sweet spot. I had the same kind of issue w an exhaust system on my collector truck. RIP Mr /MRS Drone insurance claim?? The water stole it!
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Check your household insurance you may be covered my insurance would cover me in that event funny I only checked that today I hope your covered regards from Liverpool
We've had plenty of those days when nothing goes well and you either have to cry or just laugh. The insulation test was interesting. We used the same stuff on our engine room hatches, then a layer of 10 mm rubber over the entire saloon floor and finally carpet. Obviously a different set-up to yours, but those extra two layers made a MASSIVE difference for the noise while underway. We can easily talk to each other where before you had to shout.
What I see as an agricultural engineer who has sound dampened engines and pumps, is that you are seeing the effect of sound sources. At low speeds, like ideal, the main sounds are from the engine. Remember sounds are waves, so you are picking up a diverse sounds traveling through different pathway. Ie exhaust noise some of which travels through air before encountering your hull and deck and others which travels directly through material. As the boat, rpm’s go up, there will be more and more hull noises contributing to sound along with the engine sound. At high speeds, the hull noises contribute more damping the effect of the engine. I have seen pump stations where the sound is water through the outfall pipes drawn out the engine/ gear drive is the pumps. Fun side effects, in my opinion.
I had the same type of set up in my boat, in addition to the insulation inside the engine compartment I had an upholstery shop make me a piece of water proof carpet that would cover the floor, it snapped in so I could take it out when I wanted to clean or do some messy fishing. This made a huge difference.
yeah some sort of mat on the top of the floor would be a good idea as the surface is hard and sorta shiny so it would reflect sound and a mat would dampen any soundwaves that do escape from the inside.
They might be loud, but those Detroits on full chat sound absolutely awesome.
I recall when Simon was reluctant to talk on camera. Now he’s doing a comedy routine!
If you want the sound insulation to have any impact you need Halyard insulation 50 mm with lead barrier, foam and foil. You also need to do the engine side walls and to add seals to the hatch lifts then you will get a good result!
Just buy some 'stable mats'. It's a heavy rubber mat used for horse trailers and cow stables, use at least 8mm thick. Place it over the motor covers, you can roll it up easy for motor maintenance. It will get rid of all the sound escaping from leaks in your floor. And the weight helps deadening the sound very much. It is also very safe when you are in bad weather, you won't skid.
Port rev counter needs adding to your to do list , sorry .
but I'm sure you knew that .
Oooooo at 8:53 its working again.
Yes we have the alternator unplugged, it’s overcharging and needs coming off!
Your test proves that hearing protection is necessary at any thing over an idle. great videos, bad luck with the drone
Recovering the drone with a few scuba divers!
Take them out on the boat to the rough location!😊❤
When recovering becomes a success and you buy the same brand and type again, you will have several spare parts.🙂
I have not read all the comments but anything over 85 dB you should be wearing ear defenders especially for prolonged trips.
Don't put a big magnet near anything electronic unless you want to make things worse.
See if you can get electrical insulation rubber matting to put on the floor. Easy to fit and easy to keep clean.
You could try adding butyl first to reduce resonance, mass loaded vinyl to absorb frequencies and both closed cell foam and the open cell foam you used. This will help manage noise across a broader range of frequencies. Doing more of the deck and surrounding structure will also make a difference.
just for your info , for every 3 db rise it is double the level so 40db to 43 x2 43 to 46 x2
You can listen to sounds at 70 dBA or lower for as long as you want. Sounds at 85 dBA can lead to hearing loss if you listen to them for more than 8 hours at a time. Sounds over 85 dBa can damage your hearing faster. The safe listening time is cut in half for every 3-dB rise in noise levels over 85 dBA.
above is a google search result for max safe db level
i love you guys, the work you do, and the fun you have. Oh, how I wish I could still work like you do.
Insulating the hatches is a great start, but you need to insulate the entire engine compartment. Roof and walls, otherwise sound will come through other areas.
Soft insulation is usually best for absorbing higher frequencies, but the main thing that affects lower frequencies is just plain mass. If you could make a second layer of deck that sat on top of the floor, that would probably help. The other thing might be to make sure the hatches are sealing - a good gasket to make sure vibrations can’t get through air gaps (easier) without going through the deck. Also making sure any penetrations into the cabin or deck area (e.g. for cables etc.) are sealed up properly.
Love the sound of those engines..
Great test, try Eva faux teak or similar, it made a huge difference to my boat, and very nice to walk on in bare feet too 👍
Thanks for the tip!
You just proved the sound insulation you put in was effective at lower frequencies you need some thin lead sheet in conjunction with the insulation material. You basically need mass. BUT you need to tackle the whole deckhead of the engine room and the sides of the boat too (not always practical with the machinery installed).
Maybe you should put some kind of floats on the drone when you're out over water. That way it'll float and be easy to recover. Love you guys!!!
What great idea. I am imagining a little yellow life preserver. Drone drops into the water, pop inflated drone life preserver makes it in a small hover craft.
@@phillipmetcalf9404you can get those for keys, would be great for drone
Nice job on re-insulting the hatches and taking us along on that adventure! I did note some other comments-but I think that they didn’t appreciate that you guys are not sponsored for this boat/ship. I agree with others about getting floor covers to assist in reducing the noise - the EVA Foam boat decking is a good choice - nice on feet, not slippery and waterproof.
Looks like a lovely day to be on the water. The winter breeze must be chilly at 50 something north. You make it fun and informative whatever the season.
Seeing the background made me miss home. That's where my love for boats started. Lived in Bethesda mostly of my junior life, then Bangor, Caernarfon, Anglesey too. Now in East Midlands for now. Keep the good work up. Learning something everyday.
Thanks
Thank you so much John x
Technically in an industrial setting Hearing protection would be required on your boat at those levels.
There's an outboard engine down there somewhere too thank's to a guy from Conwy Marina.
😂😂😂 Simon: …you know what the most remarkable thing on this boat is? the whiteboard. Hilarious! John Cleese or Mel Brooks couldn’t have come up with a better one-liner! Keep up the great content.
If you have the drone insurance with DJI it allows you 1 or 2 drones if you lose your drone look at your insurance DJI care have just introduced fly away cover if you've only bought it recently
You two are goof balls, and I enjoy spending time with you.
Hitting the smoke notch watching the fuel go down woohoo good fun. Thank you for taking the time to show us the effects of sound proofing
Use the one with lead between the foil and foam, it does a top job.
Sorry about the lost drone. Good job trying to improve your noise issue. I have done a few projects at work (5+ years ago) to reduce the sound levels on production equipment. They were difficult projects but very rewarding. One of the things I found was frequency was very important to pick out the right sound damping material. Once we know the major frequencies, we than picked out insulation that was appropriate for the primary frequency(s). Our vendors told us Low Frequency is very difficult to dampen. High Frequency is fairly easy to dampen, of course we had a lot in the mid-range too. What might help is the laminated material; foil, foam, dense rubber like material, foam, adhesive. The dense material will block more of the high frequency sound waves. We used about 6 different materials, including the one that looked just like what you used. Hopefully insulating the other areas will greatly improve the sound levels.
Shape also comes into play too, in sound proofed rooms they use triangles at 90* turns to each other so it breaks up the sound waves instead of reflecting off a flat surface. Even simple at home sound dampening can be done with egg cartons.
Gemma, you should be covered by your insurance, you just have to prove where you lost it. It’s not your fault it was a faulty drone . The insurance will want to know where it was lost and the coordinates. Plus the video of it going in the water. I wish you all the best, love your videos. ❤️❤️ Roy
Every time I see your new vids I want to reach through the screen and tear off the blue protective film on the ignition locks!! :)
Many many years ago in fact more than 50years I built a small speed boat powered by a 1500cc petrol engine mounted directly on the bearers the propshaft thrust was taken by the rear gearbox bearing . To try and reduce noise I change the instalation I mounted the engine on fairly "Soft" mounts and mounted a thrust bearing on a seperate frame fixed to the engine bearers and used a short double UJ shaft to connect the shaft to the engine . The boat was trans formed !!! So much Quieter. Most engines appear to be mounted on fairly " Hard" Mountings therefore transmitting vibration and noise to the hull. The whole hull of a boat acts as a sound board!! The only problem is this takes up more room but does not require as accurate lining up of Prop Shaft !!
Some shaft couplings are meant to be connected slightly out of line. The movement keeps the grease moving between bearing surfaces.
@@Dave5843-d9m Agreed!! Ideally for road work UJ's should be running between 2 to 5 degrees, beyond 5 degrees UJs will overheat causing quicker wear and vibrations can become an issue.If installed perfectle straight they wont last as long because as you said the grease wont move around
Sealing the frame edges would also help but deck mats sound like the easiest and most effective option.
Every 3 decibels increase is double the sound... it's called an exponential scale eg 6db is twice as noisy as 3db. 100db is 4 times as noisy as 94db - hope this helps 🙂
Very helpful thank you! X
@@ShipHappensAdventures Another thing watching the video, the distance you hold the meter is critical to the measurement - really to get a good reading you should mount it on a tripod or something to maintain your distance... very interesting though (sorry about the drone 😞)
Well yes *and* no. "double the sound" and "noisy" doesn't make sense without a subjective scale to plot it on... and while the dB scale isn't perfect in that regard, it's pretty OK.
Simon, you get the dad joke of the year award,that was fun- ny….
😂😂
You are well into ear defenders territory there, I put 30mm closed foam under my hatch and it did make a difference but it was still flipping loud at 25 knots. Very jealous of you guys, I had some great times at Conwy Marina
Nice work, idling up to the 'mooring ball'.
Sound reading is part science and part art. Point the microphone in a different direction and you can drastically-change the level of sound recorded. But yeah, 8 dB is really nice savings.
I feel your pain on the drone. I got our DJI wrapped up in tree branches, and it freaked out and bounced off the roof of the house, landing in the yard. While damaged, and I had to put the old props back on, it still works. But yeah, the DJIs sometimes do silly thing trying to be 'smarter' than you are.
Great vlog guys, very interesting. Anything over 85db’s needs ear protection if over long periods. I would tend to buy some radio ear sets and tune into Radio Caroline. LOL. Its a pleasure craft enjoy it. Sad about the drone, hope you can recover something from insurance. Stay well.
The point about trying different locations in the boat for measuring sound is a good one, the 1 place it counts is the level that your ears are at. I thing that carpeting the floor would make a huge difference in the amount of sound inside the boat. I am picturing the sound bouncing back and forth from the floor to the ceiling and back. Carpeting would absorb the sound instead of reflecting it.
If you can't win the day even for the cost of 1000 quid, you got to laugh.😂😂😂 What else you gonna do, cry?😢 Quite the day you had.🎉
Wonderful to see you getting out there.❤
In Canada any noise over 85db requires hearing protection . My boat has similar sound ranges as yours and we all wear ear muff type hearing protection above 1200 rpm that I keep in side pocket of cockpit . Will consider trying the stable mats previously suggested. Thanks
WHAT? I CAN'T HEAR YOU! (Oh I've still got my ear muffs on!)
A friend of mine with the same boat keeps large fenders stored outside of the engines and it makes a huge noise reduction. A lot of noise comes up the sides of the engine room, not just through the deck.
Imagine this will be on Sarinda one day
Great content today ,boat runs fines .insolation not bad in the area where throttle is try car deadening foil I think it's only 6 mm but has good affect.
Boujour de France.
I also isolated the engine of my 1978 speedboat a Perkins 4108 which before the work forced me a navigation with protections in the ears.
I did some research and as you opt for a small price, which did not work.
I resumed with an industrial product that consists of three layers: a hard layer, an absorbent layer and another hard layer (caouthcuouc). The price is high but the result is spectacular.
I think the noise reduction is in the range of 60% to 70%.
I can't imagine a speedboat with a 4108. Surely I'm not the only one who's intrigued? I'd love to see a video.
@@davesmith60 This is a translation mistake and is an internal engine in a Freeman 24.
The engine is inside the house and I confirm the 60% noise reduction.
AHH, ok. A freeman 24 is a beautiful cabin cruiser in my opinion. Has a really timeless line. And probably nicely suited to a 4108.
Wow I thought my boat was loud but yours is insane!
25:06 those results show around 3dB reduction at the lower speeds and about 6 or 7 at high end… that’s a reduction to half the noise level and about a quarter at the high revs… I know you may be thinking well it doesn’t sound like half or a quarter of the noise but that’s because I mentioned in my earlier comment that the dB scale is non linear it’s what’s called logarithmic. If you had used a linear device the. It would clearly give you readings that showed half or a quarter of the sound level
The air intake on my diesel car has damping chambers on the side of the air inlet feed pipe. Running without that pipe is considerably louder.
I think you will need your look into some harmonics science for the air intakes.
Check out the Fiat Panda or 500 1.4 litre.
Thanks!
Thank you so much Dave x
Drone company's must love boaters i watch a lot of these channels and have seen many drones take a drink.
It would only take ONE motor to fail on the drone, and it will crash land .....As you proved!! Beware using drones at sea, slight salt contamination will see them dead!!! (in the water) - Very interesting video (and the most expensive you will ever make) all the same!! John
Look into using hard battens of mineral wool like Soundsafe
I feel your pain with loosing the drone. exactly the same thing happened the 1st time i launched mine from my boat. felt devastated. rip drone
DJI have said there drones should not be taken off from a boat!!
Well it can, but if engine seals around hatches etc are not good, it will be all for nowt. Decibels. An increase of 3dB is twice as much, -3dB is half as much. plus 10dB is ten times as much. Decibels are a Logarithmic scale as opposed to as LInear scale, we use it because it better represents changes in power (volume) than a linear scale could in respect to the human ear (0dBA being the threshold of what most people could hear and anything from 85-140dB considered harmful, 140dB very harmful 🙂)
Interesting video. After the drone went into the water I was thinking maybe its time for a new adventure, SCUBA diving!!! I bet you would get lots of stuff diving and magnet fishing :) keep up the good work
Simon you have massive spring tides coming up around 2nd weekend in February the 12th I think is highest but a few days either side will also be good , but watch the shifting sands
G'day Gem nice to see out from under the accounts. G'day Richard, nice to seeya. Insurance Company? You were talking about footage show it to the manufacturer and insurance companies, and get another drone. Thanks m8s, that was a good one. Sound insulation is important, but it also traps heat a bit. Nice goin m8s, done well, thanks Richard.
Great scientific experiment episode
It might be helpful to try automotive sound deadening sheets on the side walls and other portions of the engine compartment roof if you can get it. That stuff is basically real heavy and adhesive so it cuts down on the vibration of the wall/roof panels themselves reducing the sound that can get through. (Getting physical access would probably be the worst part.)
The sound you measure might not be all direct engine sound, but also resonances. That could be why the amount of dampning changes with rpms. like it's fairly common for cars to have an annoying exhaust drone at around 2000 rpms, when people have added some kind of sports exhaust.
2000 rpm is probably where the engine's are at their best point of balance. Adding sound insulation to the tank walls where possible will help when the tanks are getting empty, reduce the empty vessel's make most sound effect. Have you figured out why the port rev counter is inactive till about 2000 rpm?
Did you check on drone assist that it was ok to fly in that location as if you was in a no fly zone it can take off then land as it’s not allowed to fly just a thought DJI have it built in
i have found out with generators that lead backed foam was the best , but rubber backed foam was a close second
one sailing vlog got a drone that floats in the water, maybe try one of those...great work as always , you scientists crack me up 😂
In love the sound of that twin diesel at 3000 rpm
As others have said the whole engine compartment needs insulating. You need insulation with some sort of heavy solid barrier in the foam. How good are the engine mufflers? How good are the engine anti vibration mounts? Are they old and hard?
You kind of need to work out where the sound is getting through and stop it. The edges of the hatches maybe a big problem. It’s unfortunate there is not much clearance between the top of the engine and deck.
100db is too loud and dangerous to your hearing. 85db is considered safe. Every 3 dB is a doubling of noise power. So if you drop the noise measurement by 3db you have halved the noise power. I don’t think you need to do anymore multiple speed trials to test the insulation. Just work to get the engine idle level noise down and that reduction will carry through to the higher engine rev noise levels.
Good luck
Thing is with a boat like that you mostly hear exhaust tones, which are marvelous by the way. You should put back some of the insulation, just cut out a round hole just big enough
Another great video guys and super fun. You didn't seem to notice that engine noise increased depending on the load met due to current and wave action at the set revs as well as the fact that the noise directly from the exhaust overtook the engine noise at higher revs. Perhaps this occurred at the level that was the same for all the tests.
So sorry that the aircraft failed and is lost, but stick to boats and you'll be OK!
Fun to watch. You didn't have a layer of mass loaded vinyl in the insulation, which is supposed to make a big difference. Maybe you can get a vendor to sponsor you to compare theirs against this stuff. And they say gasketing makes a huge difference. But in your scenario, in the end, a layer of carpet on top of MLV may be the best solution of all.
sorry for the lost drone, I hope your insurance covers it for you, this summer you should have some fun on her, fishing in offshore deep water, if that's you thing of coarse, If I was you I would buy some charts and see likely fish holding areas, like wrecks, reefs, gulley's, etc., Be safe and have a good time.
One thing I thought about is that in the first idel test, you put the meter on the floor, but all others you hold it in your hand a bit above the floor. Wouldnt that give different readings?
The engined are doing very well.
If you put seadek it would add insulation and grip. You can get different colors and patterns. I don't have it but have heard good things
It might help if you could seal the compartment so that it is airtight.
My brother who’s no longer with us as a fisherman called the “white caps” white horses depending on how bad they were to go out with his steel hull boat
They are called officially white horses as said many white horses
Maybe 2000rpm is the boats sweetspot that it resonates at where the whole boat is acoustically in harmony with the engine. Maybe look at the engine mounts to see if they need replacing?
I'm a lorry driver,and when some is overtaking and you get level with each other,there is a harmonizing noise with both engines side by side ,you hear on twin engine aircraft when their engines are running slightly out of sinque I think that's why it's 96 with all three tests
Need to do it with canopy on to try in eliminate any external noises
Fenders led out at Sea under way? 🎉
Was it just me, or was the initial test with the meter on the floor, but without the insulation it was handheld? Would it matter? I'm gonna go watch again.
I speculate that there will be a particular RPM where the hull resonates at the same frequency as the shafts vibrate at, so at that RPM the majority of the sound won't be coming from the engine bay. That could be 2000rpm on your boat?
Remember one part of your sound (DB) readings is caused by vibration. Vibration is different at different RPM's. and this is transmitted throughout the hull causing sound. I think you said at 2000 RPM the DB readings were the same. I would possibly call this the resident frequency.
Those numbers indicate that you need hearing protection when running under power.
Would you be able to travel to Europe and the Med in that boat or would the fuel costs be prohibitive? I’m used to seeing people going any distance on sailboats but I’m just wondering if you intend to travel on it?
Great videos as usual, thanks. I was especially keen to see your sound level results as I've had little success with my sound insulation. I added insulation to previous boat and tested in all cabin spaces and it made zero difference anywhere. One thing I'm suspicious of are the engine mounts. The engines have solid mounts and I'm guessing therefore the whole boat radiates noise regardless of any insulation. I haven't made changes to latest boat (also with solid engine mounts) as I assume the same results. I'm guessing fitting rubber mounts would require also fitting UJs to the prop shafts. As your insulation made a difference, I assuming your engines are on rubber mounts and you have UJs? What does anyone reckon?
Sound dampening acts like water leaks through cracks and seams. You will get better results with adding weight like lead vynil, and close cell foam used is soundproofing. Seal all seems with lead vynil sheets.
I think that when you changed the battery. The connection was not locked in correctly. So it had power till it popped off.
Can you not get an emergency floatation device you can attach to a drone? May be a wise precaution when using around water? Edit, there are floatation devices for DJI Drones, i think they are meant for taking off on water but they will also stop your drone becoming a Sunmarine.
At 2000 rpm, since sound is essentially vibration, maybe the resonant vibration of the hull, deck etc, is constantly going to show 96 db.
Beautiful boat
Thank you very much!
You have no chance of locating the drone. The current on the River Conwy moves stuff around. I have dived there numerous times looking for lost item and only very rarely is stuff found. Good luck though. 👍🍀
Use dyno mat or similar sound deadening car audio the your thick insulation
What about the floor around the doors.
Are both engines coupled with the same rev counter?
With jokes like that Simon must have worked in a Christmas cracker factory.
Could the exhaust noise be transferred? At 2k maybe that’s the harmonic sweet spot. I had the same kind of issue w an exhaust system on my collector truck.
RIP Mr /MRS Drone insurance claim?? The water stole it!