Does an air dam work on cat hulls to reduce lift at high speeds.

[martin]

As the title says on cats like Miss geico, Mystic, Appiritions etc to help with blowover or is it more affective on hydro hulls. This is using the above hulls with uprated motors & esc with something like the Leopard 4074 2200kv on 4s & possibly 5s for short straight line runs. Your thought please. Martin.

[slowride]

Good question Martin. I, to would like to know more about the "air dam". If someone would post a photo it would be helpful......

[martin]

The dam itself is a very simple easy thing to make & fit, a lot just use a piece of platic angle hanging down around 1/2" & set back 2" from thr front of the tunnel. But this is normally on hydro hulls, im interested in knowing if it has the same possitive effect on cat hulls at high speeds.

[osprey21]

Scroll down a bit:

http://forums.offshoreelectrics.com/...-can-do!/page3

[Fluid]

I have found an air dam to be highly effective on both hydros and catamarans. In fact several of my past SAW records would not have been possible without an air dam. Today I make them by taping a length of plastic drinking straw (large diameter) across the entire tunnel, 2-3" behind the front of the tunnel floor.


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[martin]

Thanks Fluid, hoped you could give your experience. What sort of tape do you find works the best.

[Fluid]

I use colored electrical tape. One hydro has had its air dam in place for over a year, same tape and plastic drinking straw.

[martin]

Do you put the tape in intermitent places running front to back along the tunnel or continuous strip of tape running the length of the straw.

[Turbo Dan-O]

Would love some more pics and info on this! Just noticed that my Apparition has a very shallow and long transition on the tunnel.

[carlcisneros]

Fluid;
I use a windshield wiper blade servo (the thin very sticky stuff) taped under my Daytona.
Works great.

[Fluid]

Do you put the tape in intermitent places running front to back along the tunnel or continuous strip of tape running the length of the straw.

A photo is worth a dozen words. Not pretty, but this dam has been in place for over a year without maintenance.....I'll get around to it sometime.

[martin]

Fluid;
I use a windshield wiper blade servo (the thin very sticky stuff) taped under my Daytona.
Works great.

What is a wiper blade servo & ( the thin very sticky stuff ).
Thanks for the picture Fluid.

[ezhitz]

I think what he is saying is the rubber part of the wipper blade held in place with double sided servo tape.

[slowride]

Thanks for the photo Fluid. I have a 36' homemade Cat made of Coroplast (corrugated pvc plastic) and is very lite and at 54mph it tends to take to the Air so Im thinking an "air dam " might help. I will be making a Dam this morning....Rat Cat 1.jpg

[martin]

Yea thanks ezhitz i can see that now, early in the morning for me & didnt make sense when i read it. Now you point it out its obvious. Thanks.