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T-REX 450 › Heli suddenly out of trim
06-29-2014 10:57 PM  3 years agoPost 1
getsuyoubi

rrApprentice

Queens, NY - USA

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Sorry for double-posting - I asked this question in the beginners forum earlier, and someone there suggested to ask again here.

I flew my stock TREX 450 Pro (flybarred) yesterday for nine batteries, and it was in perfect trim. All landings were just perfect. I put the heli in its aluminum case, kept it in the garage overnight, and took it out again today. I went to the same field, the weather conditions were the same, I used the same batteries - but the heli needed four clicks of forward cyclic trim to stay level! Yesterday my cyclic forward trim was centered, so it's not that I changed the trim by accident. I tried to move the battery forward as much as possible, but that didn't help (the canopy is a very tight fit, so the battery basically always ends up in the same spot anyway).
Just for completeness: I used that same transmitter (DX6i) for my neXt simulator after yesterday's flight, but I'm using a separate model for that, of course.
Does anyone have any idea what could be going on?

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06-29-2014 11:36 PM  3 years agoPost 2
AWittleWabbit

rrElite Veteran

O.C., CA

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kinyobi is better...
If you've made sure your trim is unchanged for all flight modes, I would look at your swash to servo links. Put your bird on the bench and see if the swash is level. Check in all flight modes, don't forget to disconnect the motor. I use a bec just for this purpose.

Unlikely but but check the head completely for loose screws or off kilter anything.

Heli-itis sufferer.

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06-30-2014 12:27 AM  3 years agoPost 3
getsuyoubi

rrApprentice

Queens, NY - USA

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The swash is level through the entire pitch range, at least by visual inspection. I didn't take off the head and used the swash leveling tool yet.
Someone in the beginner forum suggested that I check my flybar paddles. On first inspection they look ok, but I'll double-check. It is certainly possible that something got out of whack when I put the heli in the case, though it never happened before.
While I agree that with the level swash the problem should be in the rotating part of the head, I don't see why this would result in a drift in one direction instead of just vibration. I hope someone can explain this to me, because I really would like to understand it!

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06-30-2014 04:08 AM  3 years agoPost 4
AWittleWabbit

rrElite Veteran

O.C., CA

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If its not a change in cg or trim, I'm not sure Do check with a swash leveler. It's worth going through the head just for gp.

Heli-itis sufferer.

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06-30-2014 04:20 AM  3 years agoPost 5
AWittleWabbit

rrElite Veteran

O.C., CA

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Almost forgot, try moving the swash against the servos by hand while the servos are on carefully and observe each servo/ link.

Heli-itis sufferer.

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07-02-2014 12:48 AM  3 years agoPost 6
getsuyoubi

rrApprentice

Queens, NY - USA

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Thanks everybody! I'll go over it with a very fine comb on Friday. Looks like it'll be too windy and rainy to fly anyway...

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