porposing?

[screwball]

i just took my new micro scat cat that i just finished building out for its first run and on 3s all the boat wants to do is bounce up and down and porpoise and if i even try to really hit the thottle the torque roll just wants to flip the boat. until i get my steerable outdrive from danny im running a strudder setup that i made but it isnt performing well. my first instinct is to go down to 2s go to a smaller prop and raise the strut, but the strut is as high as it will go i was wondering what you guys thought i should do to settle the hull down in the water. i was also thinking about moving the battery further forward.


thanks!
James

[Flying Scotsman]

James, what motor and prop....3S is probably too much without knowing all the parameters

Douggie

[sailr]

move your batteries forward a bit. Sounds like it's stern heavy.

[Eodman]

Search thru the posts for a thread on a magic part for the jolly catamaran, basically a small wedge put on the back end of the tunnel.

Try this as last resort after trying battery movement etc...

I know it helped my Twin Jolly but its 35 inches long!

[Eodman]

It won't help the torque roll --- but it will help the bounce!

[screwball]

thanks guys tommorow im going to try on 2s with the battery moved forward and see how that goes

[domwilson]

Have you tried changing the strut height, angle, and/or the battery location?

[Rumdog]

The torque roll is probably due to too large of a prop. What kv is your motor? What size prop?

[screwball]

im not sure on the prop but its the stocker from the velocity mono im going to try a metal one i have thats smaller and go down to 2s, the motor is a feigao 380 11s

[Jesse J]

I agree, strut up, prop down, lower voltage. I did the same thing at first, but ease into that hull,really easy to overpower it.

cheers
j

[screwball]

ok heres what i did

i propped down to a smaller prop
raised the strut as high as it would go
added 1 quarter ounce egg sinker to the tip of each sponson
went down to a 2s lipo

results tommorow
james

[Rumdog]

Got any pics of your setup?

[screwball]

ill try to put up a few tommorow morning before i go to school for now i hjave to go take a 5 and a half hour nap....

[Jesse J]

Ok, let me back up. Ideally you take one change at a time. Sounds like you changed everyting at once. For the strut, just try to make it a tad above the base of the sponsons ride pad. I have seen those puppies move and they have a bit of nose up, so do some searching and see how others have set theirs up. Once you get close, make little changes at a time, otherwise, you will be back with the dolphins..

[6S HYDRO]

3600 kv motor- a little hot for 3s with big prop