Toysport Jolly "magic part"

[Eodman]

Just received the part that Joseph Toth sent me. Its a wedge and you can see from the pictures were it sits!(between the drives)

According to Joseph it makes the boat ride much more stable with considerable less bounce!

I'll take a couple of pictures of the actual part that he sent and include measurements in case someone wants to try and duplicate it for their boat!

My part is yellow so it should show up pretty decent on a dark background!

[obrien]

its basically just a tunnel extension. Not only should it help settle the boat, but it may help top speed

[Eodman]

OK the part measures 3 7/8 x 2 1/2 x 9/16.

As you can see(I hope) it's a wedge!

[Eodman]

Now I have a question - Joseph has said that I should just epoxy the part in place!

Should I rough up the surface where the part sets to get a better adhesion?

[z400]

roughing up the contact surface on both the hull and the wedge will help the epoxy bond to either surfaces.

[Ub Hauled]

Before you place that I think you should know that same people use trim tabs...
just an FYI

[Eodman]

Thanks I appreciate the thought! But I have to believe that the man who designed and built this twin Jolly believes that this is a better alternative!

With this having twin drives I'm not sure where the right spot would be for trim tabs!

[Avanti]

Kind of takes the place of a tunnel tab, obrien is right on the money. You might want to think about making it adjustable some how.

[Jeff Wohlt]

MTI does this on race boats only...we saw it and discussed it at Randy's shop (MTI) His was made of 2" teflon and has trim rams on it. Only good for higher speeds but says it works well. Tunnels the air and provides lift

[bonewar]

Awesome idea , I've been thinking about this type of trim tab for my twin maritimo cat. here is a pic of a real one on the boat. enjoy!!!

[G Doggett]

Thanks for the info and pictures.
I must make up something similar for my twin Jolly to tame the bounce.
Maybe if I make it from some flexible material like plastic sheet, or even carbon fibre, and attach it only on the front edge it can be adjustable on the rear edge with some screws or bolts like we do with trim tabs.
Hmmmmmm, have to get creative.
Graham.

[Eodman]

Well I had the cat out today after mounting the part on the hull and it does make quite a difference! The bounce is gone! You apply the power and it just lifts and goes .... Full Tilt Boogie!

But I'm still nervous running this thing, it handles well .... just not confident in my abilility in driving this fast!

But I love this boat!

[Ocean Racer]

sounds good maybe it need a little more surface area to run on. wait which way do they usually bounce forward or back?

[Avanti]

By bounce, I believe he means porpoise. Where the boat hops in and out of the water like a dolphin

[Ub Hauled]

sounds good maybe it need a little more surface area to run on. wait which way do they usually bounce forward or back?

Up and down