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First down on the 50 yard line

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d4570 View Drop Down
.416 Rigby
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    Posted: 23 November 2019 at 16:18
Water test
To bad the wind was 50 mph and cool we would have made some
adjustments on the river bank.
The movement of the motor and other weight back helped a bunch.
I still can move the motor but a lot of effort.
I was going to move it a foot then chickened out and went with 6".
Could have gone 8".
I'm going to lift the prop end another inch I went with 2 the first time.
We had troubles with the 64" prop hitting water as it splashes in the back, It eroded the prop some in a 15 minute test. I could get 3900 rpm with the new gears that puts me around 2500 rpm on the prop.
We put the 3 blade 59" prop on with the steepest pitch blocks I can get. 4600 motor rpm that's 2900 rpm on the prop.
Max for the prop is 3100 And I don't want to run that many rpm if I don't have to. I'll try a different sprocket I have. I can back off to 1.3 instead of 1.6 ratio. If I can get 3700 on the motor that's 2850 on the prop. About the same and 800 rpm less on the motor.
Here is the test vid.


 




Edited by d4570 - 23 November 2019 at 16:20
Remember: Four boxes keep us free ,the soap box, the ballot box, the jury box, AND the cartridge box
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BEAR View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 24 November 2019 at 08:21
Not a speed demon; but seems to handle nice on the slow speed turn.  the vertical air rudders seem to be working fine.  

As with all fluid powered boats, the steering drops of  as you slow, needing rpm to turn.


50 yard line and going to the red zone.
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d4570 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 24 November 2019 at 08:45
We where still having a time steering it , still needs work.
We did have it up to 15 mph once.
The 3 blade gave a LOT more push over the longer wood two 
blade prop.
I have a support in the very back that drags like a drift sock, just about the time it wants to come up on plain.
Gota address that too.
The seat was to close to turn the handle bars, we took it off and could turn much better.
I'm now thinking about an actual steering wheel.
I'm going to add some more width to the rudders,too.
The new tractor mufflers helped tremendous. The 1600cc bug motor runs better with a little back pressure.
Next is maybe a little blower on the carb???Clap


Edited by BEAR - 24 November 2019 at 09:44
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BEAR View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 24 November 2019 at 09:45
All sounds good .    15 mph sounds great.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 24 November 2019 at 14:59
That looks great D. 

It looks to me that it sits level in the water. That's very impressive. You are the only guy I've known that has built his own boat from scratch. Very cool.

Wing master
I have always considered myself to be quite the bullshitter, But ocasionally it is nice to sit back and listen to a true professional......So, Carry on.
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