Black pearl

[iridebikes247]

Very nice work,

[dasboata]

great job Larry !!!!

[T.S.Davis]

Raptor347 sponson aero mod was used on his SAW Whiplash to reduce lift and try to prevent blow over going 100mph.

That's the way I remember it too. Larry might miss that lift on this one. These run flatter than a Whip.

I have got to get some pics of the new fins one of our club members is making. Stainless steel CNC rolled with an extra layer of stainless reinforcement welded above the water line. Trickest fins I've ever seen. Trying to talk him into production. Think Virginia Craftsman only thinner. Going on my Pearl for sure. He's cooking up a new fin for my scale T plus.

[TRUCKPULL]

Larry might miss that lift on this one. These run flatter than a Whip.

Terry
So far No problems with not enough lift.
Last Sat. it was rough and windy with the wind coming right down the length of the pond.
Full speed with the wind and into it.

Larry

[longballlumber]

Terry
So far No problems with not enough lift.
Last Sat. it was rough and windy with the wind coming right down the length of the pond.
Full speed with the wind and into it.

Larry

How well is it carrying the speed THRU the turns? Have you seen any hopping (front) coming out of the turns?

[detox]

Turnfin shape and size is one area I need to do more research and testing on. Some of the more experienced racers such as fluid should know what works...he once told me my angle was too aggressive and will cause hull to hop or run too wet in turns.

[TRUCKPULL]

How well is it carrying the speed THRU the turns? Have you seen any hopping (front) coming out of the turns?

Mike
After trying two props that ended up being too small on the Dia.
I was only able to make one run with a prop that finally got it up and running with some fast speed.
I remember one of the other boaters (Gas & Nitro guys) saying that "That thing does not slow down in the turns"
I did not see any Hopping coming out of the turns - Although I was more concentrated on just driving for the first run.
I will bring my generator next time so I can recharge my packs, I hope the wind will be down a bit on Sun.

Larry

[TRUCKPULL]

Turnfin shape and size is one area I need to do more research and testing on. Some of the more experienced racers such as fluid should know what works...he once told me my angle was too aggressive and will cause hull to hop or run too wet in turns.

Keith
They used to say that Prop work was a BLACK ART
With the speeds that we run now for racing, I think Turn Fins are becoming a BLACK ART also.

Larry

[longballlumber]

Mike
After trying two props that ended up being too small on the Dia.
I was only able to make one run with a prop that finally got it up and running with some fast speed.
I remember one of the other boaters (Gas & Nitro) saying that "That thing does not slow down in the turns"
I did not see any Hopping coming out of the turns - Although I was more concentrated on just driving for the first run.
I will bring my generator next time so I can recharge my packs, I hope the wind will be down a bit on Sun.

Larry

Thanks for the reply Larry. I am still working to get my boat turning the way that I like. I did a similar sponson mod as you however, I carried the chamfer along the entire length of the sponson rather than an elongated corner.

If you don't mind;

Picture of layout RTR
Balance Point
Turn Fin Depth
Distance from trailing edge of sponson to leading edge of turn fin (at water line)
weight RTR

[TRUCKPULL]

Thanks for the reply Larry. I am still working to get my boat turning the way that I like. I did a similar sponson mod as you however, I carried the chamfer along the entire length of the sponson rather than an elongated corner.

If you don't mind;

Picture of layout RTR

Balance Point
Turn Fin Depth
Distance from trailing edge of sponson to leading edge of turn fin (at water line)
weight RTR

Hello Mike
I like your sponson mod, also the solid block rounded nose.

Balance Point - About 1 1/8" behind the sponson, although since mine is a little heaver in the front because of all the foam and extra reinforcing I did.
I may still move my motor plate behind the bulkhead, which would move the motor and plate 1/4" to the rear.
In turn this would move my CG back a bit. I think I would like to see 1 3/8" to 1 1/2" behind the sponson, this would put me closer to the center mass of the turn fin.

Turn Fin Depth - 2 1/2" Deep X 2 1/2" in length at the water line. Also this fin is not sharpened, It is machined top to bottom 0.030" at the leading edge to 0.125"at the back edge, then blended at the bottom edge.

Distance from trailing edge of sponson to leading edge of turn fin (at water line)- 1/8"

weight RTR - I do not know - (No Scale) - It may be in competition with Terry's Lead Sled

[Shooter]

Here are a few vids of mine running last year. As Terry says, it runs flat. The scope was to design a boat that could withstand the speeds of full P and actually stay on the water (thus the wider stance and angled air bleeds). It eats smaller boats for breakfast in rough water. Mine still could be better in the turns, but our course is pretty tight (small radius). I'm curious to see what you guys come up with. We can add the mods to the design if they work well!!

http://forums.offshoreelectrics.com/...15!&highlight=

[Shooter]

BTW - That boat looks grrrrrrrrreat Larry!!!!!

[Beaux]

WOW!! Goes fast and turns, cool.

[TRUCKPULL]

BTW - That boat looks grrrrrrrrreat Larry!!!!!

Thank you Pete

I went ahead and put my motor plate on the back side of the motor frame, I was then able to move my ESC a little farther back also.
My cog is now 1 7/16" behind the sponson, a lot closer to center mas of the turn fin.
I have not been able to test this yet seeing the weather did not cooperate last SUN.
I am also waiting for a couple of props to come in for more testing.

You had made comment about a piece to keep the none in place side to side, Did you ever come up with something??

Larry

[Shooter]

You hade made comment about a piece to keep the none in place side to side, Did you ever come up with something??

Larry

I have a small pc of wood on the bottom of the hull that stands proud of the surface on my LSH to hold the nose cone on, but my P-Sport doesn't have anything. I've been taping it (top and bottom) and it hasn't been a problem.

I'm heading out to the pond tomorrow morning to try some things to improve turning. I have a feeling that I'm just going to have to face the fact that my boat will never turn like Mike Ball's boat! :)