The Black Pearl LSH Spec Hydro 2019

[InspGadgt]

How much angle was on the old version of the pearl?

[T.S.Davis]

Over the weekend I raced it. On start up I struggled to not nose dive half way to the bottom of the lake. I had to peg the throttle or it went down like a submarine. Then I blew off once. Jumped the fin once. Think I hit a buoy. Boat IS super fast but I couldn't finish a heat to save my life. I may have built it too light. It could be a learn to drive it thing. I need more time with it. It's just a different animal than a Stealth. We knew we were into uncharted territory with this design.

A number of us cold water guys struggled with first race gremlins down in Atlanta.

[Shooter]

Those are pretty 'safe' numbers Larry! Haha! Tried and true. :) I agree with them completely, but we were trying to do something different with this boat.

The full size Black Pearl has a 3.5deg kick-up angle which seems to work perfectly. Should have stuck with that, huh? :)

[Shooter]

Here is Terry's first and second run again. Disregard the fact that it's climbing the fin. The strut was very high, so the AOA was probably reasonable, but the bottom of the boat is not level (rear end is low). If you start lowering the strut to lift the rear, it is completely stuck to the water with bad behavior in the turns. Don't get me wrong, it could probably win races in this trim, but it's certainly not optimal. We'll keep working on them. I'm thinking we need to increase the AOA though.

https://www.youtube.com/watch?v=7tx_1fFGERc

https://www.youtube.com/watch?v=dwQ9ScqPd2U

[T.S.Davis]

Another thing I've been thinking about is less pitch with more diameter. Pull the rear end up without driving the nose down on start up.

[longballlumber]

Terry - I am assuming your running the new style ABC GameChangers (1816-17? guessing)? That is what you were running before.

Pete - I am assuming your running the H series ABC (H5 is what you usually ran)?

Those are COMPLETELY different animals. This explains the need for Pete to raise his strut and hopping he described. With Terry talking about lowering his strut and the suggestion that it's dragging the ass.

I hate to tell you this Pete, but if your expectation is to keep changing a boat design to meet a certain handling goal you will need to tell everyone what prop to put on the boat! Just my 2 pennies

[Shooter]

Yes, H5. H7 if I'm going for more than just podium.

[TRUCKPULL]

With the "H" series being a lifting prop and the ABC 17 series being a pushing prop with a lot less lift.

The 3 to 3,5 degree AOA leaves enough room for adjustment for both types of props.

Larry

[longballlumber]

With the "H" series being a lifting prop and the ABC 17 series being a pushing prop with a lot less lift.

The 3 to 3,5 degree AOA leaves enough room for adjustment for both types of props.

Larry

[Shooter]

I have to admit, I haven’t thought a whole lot about prop lift during design. I’ve concentrated mostly on keeping the afterplane level and letting the hardwired angles of the hull do the work.

So…I’m aware that the lifting props create a larger thrust cone. Do these new ABC props have a smaller thrust cone? They seem to have fairly high rakes. It would be nice to balance the boat such that ALL the thrust goes into speed instead of lift. I know a few people (that run really well BTW), that have boats balanced such that if you set it on a flat surface, the a$$ is in the air.

[T.S.Davis]

Pete, we're close. Call it a gut call but I think we're close. We've spent very little time with it. There are still guys that can't make the Stealth go. There are also guys that run H5 and the new style ABC on those without changing much of anything. That boat will take even more prop. So will this new boat. Need time though.

[Namba328]

Terry what motor are you running?

[T.S.Davis]

Just a Proboat 2000. We've tried all kinds of crazy things and kept coming back it. 10th scale we still run the 1500 but they are super scarce now.

[Namba328]

Just a Proboat 2000. We've tried all kinds of crazy things and kept coming back it. 10th scale we still run the 1500 but they are super scarce now.

That's my problem. I've been racing against Chris Emmard out here running the dam 1500s and mine blew up last race and I can't find another one. I'm running a PT stealth and now I'm stuck without any idea on what to put in it.

[InspGadgt]

There's a couple close in size around 2000KV at Hobby King that I've considered getting as backups for my AQ2030...but they are all 4 pole not 6 so I don't think they would have quite as much power.