A good round eared chopper is about as efficient as it gets as long as your boat doesn't mind some bow lift. They aren't high speed tunnel Hull props but I'm a v hull kinda person anyway. The Texas style skiff looks like a fun boat to play around with but I need to wait till they get a bit older and more affordable to go hit these gravel bars in TN with one.
Actually its not.... look at the telltale pisser barely any water coming out, having a jackplate up that high with a short leg is asking to blow up the motor, not to mention a surface drive prop is designed very differently to a normal fully submerged prop, so you're more than likely over revving your motor on top of lack of cooling water... smart....
the whole video I'm just looking for the pisser stream and I'm just not seeing it. I would be terrified that I would burn up the motor. The prop is impressive but not if it is at the risk of loosing the motor. I see the comments about the low water pickup, but I still feel there should be more water coming out of the unit. Please explain if I'm wrong. I want to learn rather than just hate on this video.
If you look closely right behind the motor you can clearly see the telltale stream. It stands out since it's heading the opposite direction of the spray
What is the point of that its putting to much pressure on the lower unit it seems like it should be in the water more in 39 years iv never seen anything like that I'm surprised the boats even moving
That's the way a prop is supposed to work on a high performance application! No more than 1.5 blades in the water at a time. If you have all of the blades in the water, you must be trolling!
@@siltslider The RXB is a good prop BUT in extreme shallow water applications or where the tunnel is feeding too much "dirty" water, it can loose its grip. If you want to give us a shout we can go over it with you!
@@powertechpropellers3858 just got my SWW4 14 pitch. My boat is a different boat. Have no problems turning at all and I can jack the motor up and actually get the cavitation plate up above the water without losing grip I could of got a 16 pitch to run higher faster but that’s not what I was looking to do pull a tube without losing grip turning and run tighter turning rivers
@@powertechpropellers3858 You are correct. I don't think Yamaha offers a low water pick-up on standard 115 motors, but Bob's Machine Shop in Tampa, Fl. makes one that is excellent.
Best props on the planet. Only ones I buy. I put props to the test and these are the only ones that hold up to sand and mud and grass and branches. Crawfishing
@@justinsholes5868 power tech. If yoir going to be in really shallow water where ur going to have to be trimmed up or up all thr way on Jack plate to get on step. Go up on pitch a fee numbers to grab more water as its cavitation so it'll keep pushing enough to get u back on plain. Poqer tech is by far the best prop for this. U just have to get the right one amd pitch. The red power tech has a thicker blades and can take more hits and bumps. And will last longer.
@@justinsholes5868 3 blade is better for shallow water too. 4 blade will vent faster. Grass and or water lilies. 3 blade. 4 blades are for bight in deep clean open water. Less vibration.
I've been running a 4 blade PT prop on my boat now for over 17 years now on my 1820 Action Craft Flatsmaster SE Hybrid. Great prop, super holeshot, minimal cavitation even when jacked in turns.
Umm pretty sure that is a direct drive boat and that was the kicker motor off that was t really the motor would be smoked and the boat wouldn’t be moving
Yo tengo un Mercury xr pura sangre 4 cilindros 2 tiempos y vi los motores powertec me pareció regular calidad y no tiene los HP que dicen un 15 % menos
How not to do something... 🤦♂️ Everybody engineers... The purpose of a surface drive is to maximize efficiency. Every prop in a fluid (air or water) reach is peak with one blade working, that is the case of sailing fly... Engine in some case has one blade with a balance mass. In water you need to put as far as possible from your hull the position of the prop that with a studied shark fin profile can work one blade at a time. An outboard working like the one in the video could work seriously under powered because of exhaust extraction limited, disturbed flow from the hull and the extreme cavitation... The plate over the blade in not for beauty... Sorry if my English is not good.
@@docksidemarine4273 it was my sport! My childhood was with Class 1 powerboat till 25yo and for the last 16 years I was in the aerospace defense industries sir
Yah it's working but that engine about to go bye bye it's not deep enough to suck in any water and its water cooled. Damage probably already done. Woooooooooopse
secret taught by Tesla: water is moved by contact with the surface not by pressure differences: Lesson learned: only the bottom of any prop is doing the work,,top is a dragger
This concept kinda puzzles me. Cause doesn't the 3 blades making contact all the time gives you more bite (holeshot) But running like this with 1/2 the prop in the water reduces drag and opens up more rpm?.....I guess I dont understand how you saying the top of the prop is just drag.
I totally disagree. Been running my tunnel hull that way for 11+ years now in the same boat issue free. Also have a water pressure gauge to keep an eye on things.
Wow impressive you get enough “grip” on the water and that thing just doesn’t rip through it. Delicate balance right there.
Been running power tech 4 blades on a lot of cats for close to to 20 years. Highly recommend. Great company to work with
Robert, any experience with the PFL 4 blade. I'm trying to prop my 23 shoalwater cat correct.
I am impressed. Very impressed.
A good round eared chopper is about as efficient as it gets as long as your boat doesn't mind some bow lift. They aren't high speed tunnel Hull props but I'm a v hull kinda person anyway. The Texas style skiff looks like a fun boat to play around with but I need to wait till they get a bit older and more affordable to go hit these gravel bars in TN with one.
How is the water pump picking up water with the cavitation plate that far above the water?
Low water pickup
Yamaha makes a racing lower unit witch has a low water pickup
@@r32dude70 so does Bob's Machine Shop
@@r32dude70 а вы случайно не знаете как реализован технически этот подбор. Весьма любопытно. У нас на кавитирующих винтах это очень актуально.
Actually its not.... look at the telltale pisser barely any water coming out, having a jackplate up that high with a short leg is asking to blow up the motor, not to mention a surface drive prop is designed very differently to a normal fully submerged prop, so you're more than likely over revving your motor on top of lack of cooling water... smart....
At what time did the motor freeze up while running the water intake in the air?
That is exactly what my G3 20ft Tunnel DLX looks like with my 4 blade PT and permatrim.
the whole video I'm just looking for the pisser stream and I'm just not seeing it. I would be terrified that I would burn up the motor. The prop is impressive but not if it is at the risk of loosing the motor. I see the comments about the low water pickup, but I still feel there should be more water coming out of the unit. Please explain if I'm wrong. I want to learn rather than just hate on this video.
If you look closely right behind the motor you can clearly see the telltale stream. It stands out since it's heading the opposite direction of the spray
Is it effective not all in water
looks like that propeller is turning backwards?????
How does it steer in a 3 fr chop and cross wind ?
You wouldnt run it this shallow in any type of chop or wind.
Lol if there is 3 foot chop you don’t take a boat like this out.
I dont see the motor pissing is this motor starving for water cooling, it looks like the water inlet is just above the prop, was it converted?
Nice surface drive
What about the cooling system? Surely that engine is dying for some water
Boat racing has been doing this for many years, I'm surprised it took this long to perfect it for fishing boats.
I was waiting for the camera to zoom out to show the boat going like 2.1 mph😂
So maybe a dumb question but could you do this with an IO and a similar prop or only an outboard?
Water pumb for engine?
Its a low water pickup
What is the point of that its putting to much pressure on the lower unit it seems like it should be in the water more in 39 years iv never seen anything like that I'm surprised the boats even moving
the point of it is to run in shallow water bro lol.
My Powertech prop is awesome
What prop model, specs?
I'm surprised the hot alarm isn't going
Hes got a low water pickup
Surfacing prop?
This is not possible in my head
That's the way a prop is supposed to work on a high performance application! No more than 1.5 blades in the water at a time. If you have all of the blades in the water, you must be trolling!
What prop are you running
They were running our SWW4.
I run the RXB four blade and a deep tunnel on a Blue wave 19 ft with 115 mercury 4 stroke with atlas jackplate and it don’t Grip when turning
@@siltslider The RXB is a good prop BUT in extreme shallow water applications or where the tunnel is feeding too much "dirty" water, it can loose its grip. If you want to give us a shout we can go over it with you!
@@powertechpropellers3858 just got my SWW4 14 pitch. My boat is a different boat. Have no problems turning at all and I can jack the motor up and actually get the cavitation plate up above the water without losing grip I could of got a 16 pitch to run higher faster but that’s not what I was looking to do pull a tube without losing grip turning and run tighter turning rivers
(Siltslider = Christopher Cline)
Where is the water pickup? The 115hp yamaha models I have seen are above the prop?
If I am correct, from what I remember on this, this boat has a "low water pickup" which is mounted on bottom end of the lower unit.
@@powertechpropellers3858 You are correct. I don't think Yamaha offers a low water pick-up on standard 115 motors, but Bob's Machine Shop in Tampa, Fl. makes one that is excellent.
What kind are you running? Yamaha 115?
That’s just the auxiliary
Best props on the planet. Only ones I buy. I put props to the test and these are the only ones that hold up to sand and mud and grass and branches. Crawfishing
Which prop do you prefer running shallow water?
@@justinsholes5868 power tech. If yoir going to be in really shallow water where ur going to have to be trimmed up or up all thr way on Jack plate to get on step. Go up on pitch a fee numbers to grab more water as its cavitation so it'll keep pushing enough to get u back on plain. Poqer tech is by far the best prop for this. U just have to get the right one amd pitch. The red power tech has a thicker blades and can take more hits and bumps. And will last longer.
@@justinsholes5868 3 blade is better for shallow water too. 4 blade will vent faster. Grass and or water lilies. 3 blade. 4 blades are for bight in deep clean open water. Less vibration.
I've been running a 4 blade PT prop on my boat now for over 17 years now on my 1820 Action Craft Flatsmaster SE Hybrid. Great prop, super holeshot, minimal cavitation even when jacked in turns.
Umm pretty sure that is a direct drive boat and that was the kicker motor off that was t really the motor would be smoked and the boat wouldn’t be moving
There's only one umbilical so one outboard, one jackplate. This is a flats boat with trim tabs, you wouldn't have a kicker on it.
А воду он где берет для охлаждения?
It has a low water pick up at the bottom
Yo tengo un Mercury xr pura sangre 4 cilindros 2 tiempos y vi los motores powertec me pareció regular calidad y no tiene los HP que dicen un 15 % menos
The water port inlet is out of the water and it's a water cooled engine. Not good!
Всё чудесно, только двигатель перегрели, потом продадут не бить не крашено)
Так он не заведён.
How it that unreal
Nice
🙏
Gotta be a 4 stroke with that horrible exhaust note
How not to do something... 🤦♂️ Everybody engineers... The purpose of a surface drive is to maximize efficiency. Every prop in a fluid (air or water) reach is peak with one blade working, that is the case of sailing fly... Engine in some case has one blade with a balance mass. In water you need to put as far as possible from your hull the position of the prop that with a studied shark fin profile can work one blade at a time. An outboard working like the one in the video could work seriously under powered because of exhaust extraction limited, disturbed flow from the hull and the extreme cavitation... The plate over the blade in not for beauty... Sorry if my English is not good.
Might wanna do some reasearch on racing boats and surfacing props before looking like an idiot saying this doesnt work. Smh
@@docksidemarine4273 it was my sport! My childhood was with Class 1 powerboat till 25yo and for the last 16 years I was in the aerospace defense industries sir
@@Tonyt346 so you know that surfacing props work great then and what you said above makes no sense at all. Thank you
@@docksidemarine4273 if you are unable to understand something is not my problem. More people do stupid things = better for my job
@@Tonyt346 lol not sure what your trying to argue here. Fact: surfacing props work great in their intended application.
your motor is out of the water sir
Too high.
Not enough water intake and 2. Motor will over rev. No load on prop
Yah it's working but that engine about to go bye bye it's not deep enough to suck in any water and its water cooled. Damage probably already done. Woooooooooopse
secret taught by Tesla: water is moved by contact with the surface not by pressure differences: Lesson learned: only the bottom of any prop is doing the work,,top is a dragger
This concept kinda puzzles me. Cause doesn't the 3 blades making contact all the time gives you more bite (holeshot)
But running like this with 1/2 the prop in the water reduces drag and opens up more rpm?.....I guess I dont understand how you saying the top of the prop is just drag.
The top is always the bottom at a certain point in the rotation. So theory is bust
Высота двигателя выставленна НЕ правильно!!!
Big on performance, and costly repairs replacing the lower unit you will burn up from running that motor way to high.
I totally disagree. Been running my tunnel hull that way for 11+ years now in the same boat issue free. Also have a water pressure gauge to keep an eye on things.
Mathew you don’t know what you’re talking about.
If only you knew what your talking about
A lot easier on the Gearcase than running it aground across the bottom.
I say keep it chopping the top
Maybe I'm wrong but isn't the 4 slot holes above the plane fin the intake for your water coolant for the engine
Water pump