And The Testing Continues

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Can we get any details on setup motor and boat?
Boat is a JAE 21 G2 (light build by Tom David)

Motor is a CMB 21 EVO

Pipe is a CMB 21 NITRO

Radio is FUTABA

Turn Fin is a David Preusse

Rudder is a SpeedMaster 20 Hydro Mini

Prop is a ABC 1819-19-38 (Mark Sholund)

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Tom,

You keep gaining on it. Not much more and you will be ready

to go. The 17/45s will throw 7% more water though. Maybe

You need a little more RPM? Nice lap times. I thought 10%

more was going to drop the RPM a little more. The engine

is running Very Well with that pipe. I have another idea to try?

I calculated 34,146 rpm with 21% slippage rate good for 82 mph.

Thanks For Sharing,

Mark Sholund
 
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Tom,

You keep gaining on it. Not much more and you will be ready

to go. The 17/45s will throw 7% more water though. Maybe

You need a little more RPM? Nice lap times. I thought 10%

more was going to drop the RPM a little more. The engine

is running Very Well with that pipe. I have another idea to try?

Thanks For Sharing,

Mark Sholund
Mark, I believe I need to restrict a little more on the water and like I mentioned earlier going back to 7 1/2 on the pipe.

Let me test agiain this week and see what happens.
 
Tom How long is that header with the bend in it
Hello Dave,

This offset header is 4 inches long from factory.

I have cut it down to 2 1/2 inches and have it set up now where it will slide inside the tuned pipe.

It is a novarossi header.

I use this set up because I wanted to mount engine in tub as LOW as possible. The header helped with this installation and keeps pipe at a low profile with back of boat.
 
Any radar on this one?

Best pass: 34,560 coming at the camera and 34,157 rpm going away per Doppler App.
 
Did you cut the bait box off the back?
This boat is the G2 model with a couple of modifications by me. The tub is shorter on G2.

The later version (GT) has a longer foot print to improve performance in heat racing water.

My Bad

In an early post I identified the boat as a JAE 21GT

It is a JAE 21G2
 
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Looks great!

Cut the water back some more and fatten the needle and it will run as fast or faster and not take plugs.
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