The Black Pearl P Sport Hydro 2017

[ray schrauwen]

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.

hmmmm......

I cut them on purpose sometimes and I have a cast iron end cap as a crucible for a Caustic solution that just easily melts the insulation off. Just neutralize it after with mixture of baking soda and water.

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Hmmm is right. You bring back an old forgotten standard from the NiMh days. Works well.

[T.S.Davis]

Ping pong balls and two part foam. How did you think the led sled survived all these years? The skins fell off the deck and the boat is still solid.

[ray schrauwen]

ROTFLMAO....

[JimClark]

so the two part foam doesn't attack the ping pong balls?

[Shooter]

I haven't done any calculations yet to see if the volume of ping pong balls will suffice, but it sure allows for a lot of air to circulate around them, which is key to allow the boat to dry out.

[T.S.Davis]

so the two part foam doesn't attack the ping pong balls?

I checked again. The Whip 20 is solid foam. The Whip 40 had the ping pong balls in it. That boat ripped itself in half because I was too cheap and stubborn to buy West systems at the time. When you build wood boats guys, don't buy the cheapest hobby shop epoxy you can find. It sucks and wont hold up. I don't care if it's West or MAS or something else. Get quality epoxy and the boat will last for 10 years. My newer Whip 40 has been running since 2010 and I've crashed it into every danged thing. Even the bottom of the lake. Still rock solid.

The 2 part pour in doesn't eat plastic. It's urethane. Not polyester. It doesn't even smell too horrible. That or I could be partially brain dead and can't smell it.

That said, I still don't recommend filling cavities with any kind of foam. Limited application is better IMO. It makes for a super super strong structure but it adds weight like crazy. A simple Whiplash weighed in at over 9 pounds RTR. That's why we called it the led sled. It also will deform anything it can when it expands and contracts. I think you would get less of that with the ping pong balls but I don't know for sure since it was a wood boat I did it in. The decking was 1/16 and less prone to that warping.

[T.S.Davis]

I haven't done any calculations yet to see if the volume of ping pong balls will suffice, but it sure allows for a lot of air to circulate around them, which is key to allow the boat to dry out.

I had a whole gross of them at one time. I put them in a scale and I thought had them secured. Suffice it to say...............HOW BOUT NO! They sound super once they come loose and are trapped inside your boat.

Uncle Norm used to put them in a battery shrink tube and shrink them together. Less likely to come loose that way. Looked like something obscene though.

[Shooter]

Looked like something obscene though.

So, I did a quick calc. You need 14 ping pong balls just to float a pound! Yikes!

[T.S.Davis]

Mythbusters raised a sunken boat that way in an episode.

[Shooter]

Well, we just beat the rain last night, literally by minutes! It's a two hour drive from work to the pond, so I was determined to get a run in. If it wasn't for the woman in front of me applying make-up (TRUE STORY!!!), I may have gotten in another run!!

Anyhow, I ran it once with the new motor (TP, 2400kv, slightly longer can). Don't know if I can trust the GPS yet, but it read 71mph! I'll have to back that up a few times because the most I had with the 1515-1Y 2200kv motor was 64.6mph. Temps, current, and ripple were all OK. It ran so good, I almost handed the boat to Kevin to take to Atlanta!

It baffles me a little because in addition to the motor change, I lowered the strut and shifted the CG slightly forward. It was faster, turned better, and no signs of blow-over. Can't put my finger on what caused it to turn better. Can a lowered strut help steering????

[TRUCKPULL]

Lowered the strut?

Do you mean deeper in the water?

Larry

[Shooter]

Yes sir. Deeper in the water. Lifted the backside and essentially decreased the angle of attack in front.

[detox]

I wonder if incorrect turn fin angle caused the previous blow over (when turning left).

[TRUCKPULL]

With a curved turn fin - any time you turn left at speed, the water pushes the sponson up and the boat rolls over counter clockwise.

Larry

[Shooter]

I never changed the fin between runs. I think it was just running real loose and it made it more susceptible to the 'riding up the fin' condition.