The Black Pearl P Sport Hydro 2017

[T.S.Davis]

Haha. No worries Pete. Forced my hand. Three of the fastest P sports I've ever seen on the pond together yesterday at the CanAm. All of them Pearls.

[Shooter]

Larry - Nice job on the fix by the way!! Looks good.

I remember what happened now regarding the crash. The boat that pierced the bottom of Terry's was actually Jimmy's boat! We were all packed together coming out of turn 4. I switched lanes and darted across in front of Terry forcing him to blow off from my wake (penalty to me). Jimmy was following close behind and went right thru Terry's boat while it was showing bottom!

Regarding the batteries in the sponsons, I fully agree that you want the weight as low as possible, but as Terry alluded to, not sure it is all that practical with the structure in there. Randy Naylor did it with one of his Hydro's. I think it worked very well.

[T.S.Davis]

Been thinking about the cells in the sponson thing. Love to hear others thoughts too.

Moving weight out to tbe sponsons gives that weight more torque around the pivot point that is the turn fin. Think pendulum. Good bad idk?

[TRUCKPULL]

Sponson walk. Large -- teter-toter. Once it starts, it would be the Never Ending Story.


There use to be a large 6S or 8S Sport hydro around that had the hatches on top of the sponsons.

There was one in FL. when I was there, - Sponson walk.

Larry

[CraigP]

Been thinking about the cells in the sponson thing. Love to hear others thoughts too.

Moving weight out to tbe sponsons gives that weight more torque around the pivot point that is the turn fin. Think pendulum. Good bad idk?

Terry, got the length of my 4, 2s cells running 90 degrees to the length of the boat. One of the reasons I got the open hull DF34 hydro was for that purpose. This puts weight out and away from the CG point and the boat is extremely stable. Now if you tried to get them in the sponsons with the length of the batts running with the hull length, I would be worried about that weight being out too far from the CG as a front-rear weight skew. If I ever build a wood hull kit, I would be inclined to change the framing to accommodate the batt configuration I mentioned. I did the same thing on the dual motor hydro build as well. Here’s pics on what the batts look like...

[InspGadgt]

Been thinking about the cells in the sponson thing. Love to hear others thoughts too.

Moving weight out to tbe sponsons gives that weight more torque around the pivot point that is the turn fin. Think pendulum. Good bad idk?

Think high wire balance bar...high wire acts use very long balance bars for the very reason that the further out the weight is, the more it will resist rotation. Same thing with figure skaters who pull their arms in to spin faster and fling their arms out to slow down and stop. However noted that even though it will resist rotation a good deal more...once it does start rotating it will have more momentum and be harder to stop.

[CraigP]

Burton, that’s correct. Except that it’s not rotating thru in one direction, where the weight can gain inertia. It’s rocking to one side, stopping, then being forced to turn directions, where it has to gain inertia again. By the time it does that, the offending water is past the boat. So I think the proper term is Inertial Damping. If there is no weight out there, then there is very little inertial damping and it can get to rocking back and forth very fast.

It’s important that the weight goes out sideways at the CG, or you introduce other problems and create a complex teeter totter.

[T.S.Davis]

Fun mental exercise aint it?

There is a difference. The wire walker isn't trying to turn a corner at 4+ G's. If he did he would want to hold the bar a little different.

I know with mono hulls we fare better with the weight centered in the boat.

[CraigP]

Agreed, on mono hulls. But cats and hydros seem to like weight dispersed sideways.

[Shooter]

Cool. I remember having this discussion years back when the UL1 came out. The further the batts were out, the slower the rotational response (lower frequency side to side motion). The concern was always the recovery. If it DID rotate, could it recover quick enough.......like what inspgadget said. Maybe since the sponson is limited by the water surface, it DOES recover. It sounds like Craig proved that.

[jmanikis77]

Are the black pearl kits still being sold if so how can I get one thanks

[TRUCKPULL]

Send a private message to the person who wrote the post above yours (SHOOTER)

He is the person that designed and cuts the kits.

Larry

[ray schrauwen]

Did these kits come with sticks, the v5.7 I have? Can’t remember and I’m packing mine up to ship to this gentleman. Sadly I will not be building this one, too many irons in the fire for me.

[Shooter]

Hi Ray. No, I've never shipped them with sticks.

[ray schrauwen]

Thanks. I gave him what I had.