pitch issue

[chris11427]

Trex 450 SE V2/XL

After crashing and rebuild I have a problem:
Equal zero degree pitch at midstick in idle up, then full positive I get +6, +9.
Swash is level neg/mid/pos
Servos @ 90-mid stick
Flybar cage and everything else on the head look appropriate at mid stick.

[RedOctobyr]

So, to make sure I understood, it's correct at mid-stick, but something has gone wrong at the positive end? I don't know what pitch you had before, what you were expecting to measure.

It's probably not related if you are getting 0 pitch at mid-stick, but I think people have mentioned that sometimes you can install the main shaft upside-down, which causes problems. One specific end of the shaft is supposed to face down.

[wanderer56]

Originally Posted by chris11427

Trex 450 SE V2/XL

After crashing and rebuild I have a problem:
Equal zero degree pitch at midstick in idle up, then full positive I get +6, +9.
Swash is level neg/mid/pos
Servos @ 90-mid stick
Flybar cage and everything else on the head look appropriate at mid stick.

Other things to look for are: Bent main blade grip, bent/loose linkage balls, bent head block and since you didn't mention what parts were replaced, the feathering shaft.

[chris11427]

So before I had around -12, 0, +11.
It didn't seem like a horrible crash, the tail belt slipped about 10 feet off the ground.
I replaced main shaft, feathering shaft, tail blades, tail shaft, tail pitch slider, and a few bearings.

Is there a good way to tell if a grip is bent, just looking at it I woild say it's ok?

[jackobaby]

with the blades removed hold one grip, then tighten the opposite side, via the feathering shaft m2 bolt. If there is any wobble there's a good bet the shaft is damaged. Obviously repeat for the opp side.

[chris11427]

Yep, I'll double check for a bent shaft, anyone know of a similar test for the blade grips?

[wanderer56]

Originally Posted by chris11427

Yep, I'll double check for a bent shaft, anyone know of a similar test for the blade grips?

When I mentioned bent blade grip, I was referring to the tab that the ball link screws into. I guess I could have been a little clearer. You will be able to tell by looking at it and see that it is not running parallel. I've bent two of them before and even though I re-adjusted to equal pitch at center stick, by the time I was full stick, it was about 1 degree off on 1 blade.