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Cool class job. I made a set of wood blades for a gyro a few years back. It was amazing how close they were when balancing.

Excellent project.

Cool video just discovered. Cool machine. Interesting the offset hinge. Indeed i seen plans of the early gyrocopter with no offset gimbal. All newer ones use the offset approach. Its fascinating to learn the development path of why things are arranged the way they are. Like the underslung approach. Of the teeterbolt raised up above the plain of the blades. Anyway cool helicopter. Hopefully you found a good name.

Thanks for sharing thoroughly enjoyed.

I will go with freezatron!!

It is impressive

Absolutely fantastic. Well done. Your mind is stunning

Fantastic.

Be careful my friend.sweet machine.

It's your exhaust pipe causing your overheating issue.theres a reason steel is used instead of aluminum because thin steel dissipates heat way better than thick aluminum .also try making it shorter too.

You might try making your rotor blades a bit bigger and a touch longer.might help you with stability.

I can't believe you only have 600 likes in this video.ill share it on my face book page for you.

Should wear a good flight suit .it's kind of important with an open cab.plus with all the testing of your concepts you will have to keep an eye on your engine hours.soonet or later you should freshen up your engine.i would every so many hours as a routine.

Nice machine .there's one thing though,when you were balancing your rotor blades in a previous video I did notice that the bolt you were using was longer on one side than the other also with the lock nut screwed on it .that could be throwing you off balance just a little .I know you try to think of everything but putting videos online is good way to get some peer review and honest opinions and criticism .something to think about.keep up the good work and videos.

Thought this was interesting Ben. th-cam.com/video/eLXjjhQ9OW4/w-d-xo.htmlsi=e95iETPf8nbVdigq

When you kick a soccer ball it does not reach its maximum travel the instant you kick it but at some time later. For a soccer ball tied to a spring the time would be 1/4 its natural period.

Moving the top tube to the top of a circular frame around the prop would fix the tail flex

Motet aircraft have a chunk of lead bolted somewhere to correct weight and balance

Have a look a a thruster ultralight or an early quicksilver you can save a lot of weight And add stiffness whilst adding control effectiveness because the turning moment will act on the outer extremities of the hull.also the hull itself is designed to go straight so you might consider a flatter bottom

Very useful explanation for me teacher👍👍👍

The helicopter built by Kiwi Cameron Carter just looks great as well as being beautifully made. A lot of homemade helicopters look crude but that one is aesthetically very pleasing as well as performing brilliantly.

Nice video, great to hear from your knowledge!

Thanks for your video. Consistently high quality. Thanks for bringing the topic of homemade helicopters to the public's attention.

How about doing a video on the legalities of building and flying your own design of helicopter ? - I would have thought that there would be so much red tape involved?? - I know one of those shown in this video was grounded by the FAA over something, possibly where he was flying rather than the aircraft itself.

wow, diy carbon rotors is quite the move

Thanks for your honest appraisal of these amateur-built helicopters Ben, and for giving credit to the constructors. Most who watch and voice their comments on video clips seem to have absolutely no understanding of the complexities involved in the design, build, testing, and then learning to fly AND test-fly a helicopter. It is no wonder there are very few that succeed.

Well said.

Very interesting. The history of Pirincho Cicaré from Argentina is a good one. Cheers!!!

I suppose that BASE jumping provides a similar thrill. Also, while all these helicopters are very nice, being the test pilot who has to prove that they can autorotate safely isn't on my bucket list. If it was, it would most likely be my last endeavor.

Sorry to be a pedant, it’s ‘dyNAMic’ not ‘dy-MAN-ic’ 👍

I know of a person who has made the engines for the helicopter he is making. He is doing the ground tests now.

5:35 -- the early Rotorways used the Evinrude, so he may have used or copied that engine.

Any of these guys that made a rotor head have my respect.

I'm curious how much help it would be for some of these guys to have practiced with RC helicopters beforehand. I've flown RC helicopters since back when gyros were fairly new and not very good but I've never flown a helicopter (because it's like $400/hr just to learn). I have been flying airplanes since before I got into RC and I can confirm from giving rides that people who fly RC models fly real airplanes better than people who have never done either because the basics are transferable. I'm not sure how transferable it is with model helicopters to real ones, but I do know that my old flybar and tail gyro helicopters are a real handful to fly because they keep both hands very busy unless you're just flying circuits constantly, where they're more stable. You can't hover a real one inverted though and I can do that with my models : )

Blade balancing seems to be a dark art. I am trying to learn blade construction / balance using a ceiling fan. Blades of my own creation. No blades through the walls, yet. I did not realize someone had created a homebuilt intermeshing system. Excellent video Ben.

Your explanation from the perspective of a creator was very interesting. I'm sure the reason you chose the Nolan coax format from all the other options was because it was a new challenge!

Good post Ben, next time give the Nolan coax machine a mention, and my favourite the Hiller Rotorcycle, but then i guess its not really a home built.

Even the fact people can build these is an achievement. Something most people will never even attempt, never mind manage.

Far be it from me to say ‘you need a guard on that’ - sorry Ben, couldn’t help myself - BUT I came across a rather troubling video of a homemade heli (with tail rotor) that had a catastrophic failure of a tail rotor blade which struck the main rotor. The main rotor then struck the ‘cabin’ and unfortunately the pilot’s head. I flag it up simply because I was surprised by the deviation the main rotor blade took when it was hit by the tail rotor blade. It struck me that a simple and lightweight ‘halo’ rather than a cabin structure would have protected the pilot much more effectively. The link is here and it’s not for the faint hearted - I did wonder whether I should share the link but I think it does demonstrate what can go wrong and that a ‘halo’ might be a solution to avoid head vs rotor blade impact. Please feel free to delete this post if you feel it is not appropriate - didn’t know how to share what I think is an important learning opportunity. th-cam.com/video/HLwXZ9NkmjA/w-d-xo.htmlsi=Dss0pMGduHJ8tXA-

I really appreciate this video and your knowledge rich presentation. You are an amazing Engineer and so your commentary on the creativity of others is perfectly placed and wonderful to listen to. Please keep going broadening and deepening your material.

You are among a small group of people.

Two questions if I may, what height clears you of ground effect and could you recommend a good book on Sikorsky?

G'day Ben, Yay Team ! Brilliant coverage and analysis... Going by the landscape and the trees - that first one, the one with the Fairing and not quite enough Gruntiness...; appears to have been levitating somewhere in Oz...? If so..., then add on another Hurdle... Back in the '70s the only way to gain a C. of A. for any new Design, fixed or rotary wing - here in Oz, was to show a current C. of A. from Britain, France, Germany, USA or Italy, (NATO Administrations all) to prove tfat someone who knew what they were doing had checked it all out and signed off on the Design & Construction. We had no Helicopter Designers or Manufacturers, and apart from GAF Nomads (which shed their Tailfeathers from fatigue...) and Victa Airtourers and Transavia Airtrucks (replacing the CAC Ceres - basically tarted-up WW-2 surplus Wirraways...) both of which were bought and built by the Kiwis...; we had Zero Manufacturing of Flying Machines happening here (until Ron Wheeler's first Skycraft Scouts in 1975 !). So, if that was trying to hover in Oz, back in the Dayze of Super-8 Film Cameras (?) ; then the Autodidactic Helicopterist was hovering totally Illegally, and having themself filmed for posterity while at it. Have you ever seen any footage of the Tailless LPG-burning Tip-Jet driven Helicopters the American Magazines used to advertise Plans for...? I always wanted to have a go at one of them, as an impressionable teenager ; but when I saw footage of the 90° Nose-Angle Rogallo with a Gas-Jet on each bottom corner if the A-Frame and the Cylinder of Propane on the Pilot's Backpack...(also advertised in US magazines...!), attempt to take off from a Hilltop - and stalling after pitching-up when the Gas-Jet Thrust on the A-Frame overpowered Weight-Shift..., aftervwhich it fell down on it's Bum, broke the Keel, draped the red-hot Jet-Tubes with floppy Dacron, which duly immediately caught fire and melted onto the poor bloody Optimistic Test Pilot... I kinda gave up on any and all Plans advertised in all US Aviation Magazines...; as all being theveork of delusional Lunatics or unscrupulous Scammers... But, what would I know - I did get to rise off the Ground in a repurposed 3rd-hand Lawnmower ; but that was well proven and tested before I got my hands on it... Home made Wind-Turbines can be fun, too ; though when a Bearing-Block fails, and the Rotor Tip meets the Tower at 1,200 RPM - it turns out to be a VERY Exciting and very FAST sort of a Failure...(the other Blade swoops over the top of it's Arc, as the Hub fractures across the Bolts, while the bottom Blade literally shivers into Splinters departing downwind... And the biggest bit of the top Blade spears into the ground like a Javelin - almost a metre from the Halfwit who was trying to turn the Overspeeding Thing out of the Wind... While momentarily forgetting Gyroscopic Precession - which took ALL the stored Kinetic Energy in the Rotor (regarded as a spinning Gyroscope...) and accessed that to pull the Bolt-Heads and Washers right through the Mounting Holes in the Bearing's Pillow-Blocks...(!). Home-made Spinning Blades can go Very very VERY wrong Very very quickly...; so I'm very glad that you know a hell of a lot more about it all, than do I... I'd love to hybridise my old Ultralight Motorglider with my Electric Motorcycle's Battery, Motor, Geartrain & Speed Controller, and it would be a joy to carve it's propeller and get back into Test Flying new stuff - but, alas, ANO-95.10 was repealed over a decade ago, so I'd have to risk being shot down by the RAAF for lack of proper Paperwork, and those Buggars have Radar, while my Aeroplane is Aluminium, pop-rivets, & Dacron - and the first two of those reflect Radio Waves far too well for me to dodge them (!). I assume that you're OK, at Law, as long as you stay below the Trees and only fly over privately owned Land - with prior written permission of the Landholder (?). Home-grown Levitation is rarely simple, I guess...(?) ! Such is life, Have a good one... Stay safe ! ;-p Ciao !

The amount of work, research, finances, dedication, and time that goes into flying machine building is NOT a stroll on the park.. To even make it this far and fail is success in itself. The courage to start and persevere till your first test.. Is too much. I congratulate them for their effort and then better next time., mr ben you are doing great, and am so happy you are among the bold men taking this journey. You really inspire me.

And yes your flying and hovering is good ... I've been the one whos been saying "get a flight manager" and you;ve stuck with it to learn the machine ... good on you ... obviously I'm still subscribed

And just think, now you're among those rare few who have made it this far. It's a gift for us just to be able to watch the progress in near-real time.

Your aerodynamic explanation on the first one is off the mark.

I think building a plane is more difficult. At least with a helicopter you can take off slowly. Having to speed down a run way in a plane is not to be taken lightly. I honestly think a helicopter is more simple. Designing a plane is what started my passion, but the fear also encouraged a helicopter.

I feel like there's a pile of ideas that could be pulled from this build to get this bird in the air again. Then again, it might be time for big changes to the design to make it more functional..... th-cam.com/video/gbVudZv2ugg/w-d-xo.html