The Black Pearl P Sport Hydro 2017

[785boats]

Pete.
If you have raised the transom by dropping the strut, then you have also changed the angle of the turn fin in relation to the water line. It's got a little bit more positive angle now. That would make a difference.

[Shooter]

Good point. I didn't think of that! Might not be much, but it's certainly directionally correct to keep it down rather than lift it. Thanks!

[TRUCKPULL]

Nice!

Installed the new motor. Why didn't anyone tell me the TP motor wires are actually windings? They are insulated. Farts! Took me nearly an hour to sand it all off and tin them. 2400KV. Gonna be interesting.

Pete
Is that the New TP-4050 or 4060?
Larry

[Shooter]

Hi Larry. It is a custom Y wind 4050, 2400kv. So far, so good, but I only have 6 laps under my belt. I think this is about the max can size you need for P. I've tried larger cans, but they just draw more current and increase voltage ripple with relatively no gain. At least that is what I've experienced.

[Shooter]

Congrats to Kevin and Mike. 1st and 2nd place P Sport in Atlanta!!

[Shooter]

Not the greatest day at the pond. She’s fast, but blew over several times. Lowered the strut and still blew over. We will have to figure out a way to get the CG more forward and I need to take a closer look at the turn fin angle.

[T.S.Davis]

I just about have Minipearl figured out too Pete. The Dragon is pretty mangled. Wont be fixed before Sunday.

[Shooter]

I just about have Minipearl figured out too Pete. The Dragon is pretty mangled. Wont be fixed before Sunday.

You'll have to let me in on your secret. I had a bear with mine yesterday. Does it make sense that the rudder on the right side of the boat could be causing some lift while making small left adjustments, and making it more susceptible to riding up the fin and blowing off?

[TRUCKPULL]

Pete
I would say YES to that.

Any rudder - with the bottom of it angled to the rear will push the rear of the hull up when it is turned.
If the bottom of the rudder is tipped in toward the hull it will pull the rear of the hull down when turned.
It is also best on any hull to run with the bottom of the rudder angled to the rear (away from the hull)

Now lets look at your problem as if this was a NASCAR ( Jack up the rear left to put more weight on the right front)
A left steering correction -
Left sponson rides up on the turn-fin, Also with your rudder on the Right - it is pushing the right rear of the hull up and the Left sponson Down
Magnifying the problem.
When the rudder is on the Left With a bit of Left correction-(Rear left pushes up) this creates a bit of downforce on the Right Sponson trying to counteract the Right sponson riding up on the turn fin.

In conclusion -
Rudder on the Left, you have a better change of NOT rolling over on a Left Correction.

This is my though on this, others may be different.

Larry

[Shooter]

Exactly my thoughts, Larry. I will move the rudder to test the theory. She's still on her toes though, even without the left input due to the combination of the faster motor and lighter nose pc (cg moved rearward).

[TRUCKPULL]

Pete
With the extra speed you now have. A turn fin with a real aggressive hook will add to your problem when doing a left correction.

I have found that a slight correction is Ok, anything more and you better be off of the throttle at the same time.

Larry

[T.S.Davis]

I ended up adding 5.2oz to move the Cg forward. Then a gigantic ABC prop with some lift. Really close. Testing was pretty good today. The course is correct again BTW.

[detox]

Extending the strut rearward will allow you to run less weight. Adding more weight slightly behind turnfin COG helps prop dig in and go.

Bench Racer and Tester

whiplash 424.jpg

[Shooter]

I lowered the strut considerably last time out, and my batts puffed. Granted the batts are 3yrs old, I'm still disappointed and about ready to give up on this new motor.

That first run, however, really got me hooked. More speed and the current/ripple looked very good (see attached)

D - I like that longer strut. I'm going to try that on my next boat for sure. Ball was telling me I should have a flat bottom strut as well. Mine is currently round.

[detox]

Run strut less deep it (less wet on sponsons) and add weight to prevent blow overs. I balanced my hull slightly tail heavy behind turnfin.

Extended strut. I read sanding the flat 90 degree edge (left hand side only) more round will help boat turn better. I know it looks good on paper, but does it actually work?