TT gt5.1 pitching up during a roll

[gazmk2]

Hey dudes.

A quick one for you, my Trex 450 has gt5.1 fbl controller and.it flies very well with the exception of one thing. It seems to pitch the nose up and kind of "screw out" of aileron rolls, static and in forward flight. The CG seems pretty good and it flies very well in all other respects so not too sure where to start on this.

If anybody has any ideas that would be awsome!

Peace.

Gary

[GIXERMAN]

i think Ady has experience with them. he will chip in hopefully.

[ady]

bonjour , could you have 1 not so good cyclic servo or it may be the feed adjustment on the cyclic ?

[SaneAdam]

Hey dudes.

A quick one for you, my Trex 450 has gt5.1 fbl controller and.it flies very well with the exception of one thing. It seems to pitch the nose up and kind of "screw out" of aileron rolls, static and in forward flight. The CG seems pretty good and it flies very well in all other respects so not too sure where to start on this.

If anybody has any ideas that would be awsome!

Peace.

Gary

Are you totally positive that you are not putting the input in during the rolls to pitch the nose up? Could you be accidentally pulling the elevator back as you are trying to lean the aileron over?

I have seen countless people have a very similar issue. Only takes a second to watch them use the tx and see they are yanking the elevator back without realising it at all and then blaming the machine or set up. I am not saying this is true in your case. But it is a staggeringly common

[gazmk2]

Thanks for the replies dudes, basically all cyclic servos are virtually brand new align Ds416m and regards to the elevator input, I'm not too sure as this is the only helicopter that does this. I can roll my flybarred raptor 30, fbl 550 and fbl 700e (both use beastx) almost dead on their axis (spent lots of time practicing this)

I'll get one of the guys down the field to watch my stick movement to see if I am phasing in elevator with aileron.

Cheers guys

[SaneAdam]

Thanks for the replies dudes, basically all cyclic servos are virtually brand new align Ds416m and regards to the elevator input, I'm not too sure as this is the only helicopter that does this. I can roll my flybarred raptor 30, fbl 550 and fbl 700e (both use beastx) almost dead on their axis (spent lots of time practicing this)

I'll get one of the guys down the field to watch my stick movement to see if I am phasing in elevator with aileron.

Cheers guys

I would say it is not you if you don't have the issue on all machines. You would expect to see bad habits like that when you fly anything.

Does the heli sit nicely in a hover? Is it creeping backwards at all? You say it does it when static which i presume is in a hover.

When you say your Cg is good…. how have you tested it? Do your other machines have noticeably better cg?

I find that you often benefit from having 2 sets of eyes when getting really accurate cg. Make sure blades are straight and at 90 degrees in relation to the model , then have someone gently raise it off a flat level table by the blade grips while you look at the skids at eye level and look for any tipping in either direction. Even a tiny bit of lean will cause issues in flight. There are other ways to check it too obviously, but i have personally found this method to be the most accurate

It may well be nothing to do with Cg at all as you say, it sounds like an fbl issue if everything else looks ok. I don't have any experience with the GT5. I do remember the Beastx having a few parameters to correct nose pitching up or down in ff. But I'm not sure if it is designed to correct such issues in a hover.

Is your swash plate level?

[maddog7]

If you are using the V2 software you could try increasing the Speed Stability parameter in the PID Control system menu.
It looks like a heli tilted about 40 degrees to the left with two arrows pointing to the left.
If you are using the older software, you'll need to find what it's called in the old system.
Hope this helps.

D