Impulse 31 setup

[sigma962]

Need some assistance w getting my new Impluse 31 up on the "pad" and keeping it there.

I know you can adjust the trim tabs, battery placement, prop strut angle...etc. Ive tried lots of combinations w no solid results.

The boat is all stock...running 2 venom 2s 30c 5000mah in series. Man made pond that I run on is smooth as glass, no chop.

Please give me some advice as to eliminate the porpoise effect...at least a trouble shooting guide.

Thanks.

[Make-a-Wake]

I found that i actually had to give the strut/stinger some POSITVE to calm the propoising

[sigma962]

Noob here in boats...that means moving the strut up as to make the prop closer to the surface?

Thanks.

[Make-a-Wake]

Yep

[stadiumyamaha]

on my impulse all it took was a small adjustment downward on the trim tabs. Before, it was really bouncing badly.

[stadiumyamaha]

also make sure the tabs are above the bottom of the boat about an 1/8"

[Back-lash]

I'm having the same issue with my boat. When you say small adjustment, do you mean just bend the tabs down a little bit? Or do you slide the tabs lower. Currently I have the tabs about 1/8 above the bottom. I was thinking of sliding them down a bit, but it sounds like that's the wrong thing to do.

[stadiumyamaha]

Don't slide the tabs, leave them at about 1/8" and bend the tabs down. It doesn't take much so start with very small adjustments. I use some long flat blade vise grips so it makes contact with the entire surface of the tabs. You dont wand to bend them so that they are curved. You want to adjust the angle of the tab length in relation to transom.

[Back-lash]

I added a little positive angle to the strut, and bent down the tabs, and the boat ran great. No porpoising at all. Thank you!

[Make-a-Wake]

Sweeeeeeeeet!!!

[stadiumyamaha]

Great.

[stadiumyamaha]

You may find if you keep the strut neutral and adjust the tabs further it should run faster. Just a thought.

[Back-lash]

Sounds good. I'll give that a try. I've been around offshore boats all my life, we usually try to use as little trim tabs as possible. We adjust attitude with engine trim (same as adjusting strut angle). We only use the tabs to level out any list depending on gear and fuel. I guess in RC boats it's different. I'll give that a try once I solve my heat issues. I upgraded props, and now I have to change all my connectors, the Deans I was using melted. Thanks for the help.

[Make-a-Wake]

Why mess with it if it "ran great" .......?

[Back-lash]

I hear you. I tend to follow that rule. Once I fix my other issues, I'll always try to tweak things to get the best performance I can. Now, the reality is that I really don't have a way to accurately measure speed at the moment, but when I do, then I'll start trying different things. That's the problem with this hobby, it's addicting, and you always want more speed.