Mhz Mystic S turning problem

[bjornar]

Hi

My twin Mystic S turns when I drive straight. It takes pretty sharp turns just out of nowhere. I havent had it in any high speeds yet, because of this problem... Original setup is: 2 x Neu 1515, 2 x Turnigy 180A esc, 2 x Rhino 4900 4S Packs. I have tried to switch to Feigao 540XL and CC Hydra 120A without any difference. Can the boat be to heavy? Please help me :-)

[nomobux]

Better servo ?? stronger linkage ??

[bjornar]

Better servo ?? stronger linkage ??

The servo should be good enough, its a Futaba S9551. I also tried to switch to a Power HD servo just to try. The linkage it SS push pull system, cant see thats the problem.

[Diegoboy]

What is your radio? Have you done a range test?
does it happen at a certain distance?

[bjornar]

What is your radio? Have you done a range test?
does it happen at a certain distance?

Its Futaba 4PK. I cant drive at all, it happens all the time and both ways.

[Diegoboy]

Hmm... What props are you running?

[bjornar]

Hmm... What props are you running?

I am running plastic 40mm from OSE (L & R)

[Diegoboy]

Graupner K series? 1.4 pitch...

Do you have any video of it doing what you describe?

[bjornar]

Graupner K series? 1.4 pitch...

Do you have any video of it doing what you describe?

Yes, Graupner K 1,4 pitch.
I will try to get a video later to day.
Thanks for feedback.

[steveo]

are your props spinning inward or outward? how deep is your rudder

[bjornar]

are your props spinning inward or outward? how deep is your rudder

See picture.

[Diegoboy]

You're running inward. (more stability)
try reversing the rotattion to outward (more speed) AFTER you figure out the issue first!

[ED66677]

you said you switched from NEU's to Feigao's and still she turns in straight right?
so this doesn't seem to be a motor/power difference between L and R!
does she turn slowly or is it brutal?
are you running L and R flex? that might sounds to be a dumb question but... if not then one flex unwinds and creates more friction so less power at prop is the result.
beside of this, I can't see any water pick up, are they flush to the bottom?

[steveo]

is there any play in your rudder left to right

[bjornar]

is there any play in your rudder left to right

No play in the rudder.