Inverted climbout problems

[Richard H]

Hi all,

Been having problems with my inverted climbouts on my 600NSP. When I do a full pitch climbout with the heli the right way up, it stays level. When doing it inverted, it does an aileron roll either to left or right.

Had a look at the swash and it looks level (will do a proper check through week with a leveling tool) from full -pitch to +pitch. Now Tim helped me out and we tried sorting it through changing ATV rates on the TX but it didn't seem to get much better. I use a Futaba 10c.

Anyone else had this problem and if so, how did you fix it?

Thanks
Rich

[GravityKills]

>> and it looks level
if it's not -exactly- level you can use servo endpoints to correct it.
But I'd do that only when I'm 100 % certain that I'm fixing the problem.
you wrote "left or right". Does it mean you can't remember, or does it change randomly? In any case, it might pay off to have a good look at the servos and test them individually.

[Richard H]

It was mainly to the left but had a couple of random moments.

I am going to rebuild the head and make sure the servos are working correct. It was flying perfect until I started doing inverted climbouts.

[squeaky pete]

soundz like abit of interaction and slop to me

[GravityKills]

>> and slop
good point. Check the swash plate carefully: When inverted, the force from the rotorhead pulls. If you pull the halves apart, and they end up at an angle, you have probably found the problem. A broken outer race could cause that (a wild guess, I have never experienced this problem).

[heliward0]

i had this on a t-rex500 but no beleved me?!! they said s i was on the sticks it was ME,, anyway i tried all thinks links. levels, slop..i finnaly got rid of it when my 500 went in HARD and snapped the head block off!! i have put it down to the phase pins on the head block being slightly off,,

[Richard H]

>> and slop
good point. Check the swash plate carefully: When inverted, the force from the rotorhead pulls. If you pull the halves apart, and they end up at an angle, you have probably found the problem. A broken outer race could cause that (a wild guess, I have never experienced this problem).

What is an 'outer race' and which halves do I pull?

[Tom Burgess]

Fly round it. I have never flown a 600 that doesn't do it apart from the ones fitted with a cyclock.

[GravityKills]

What is an 'outer race' and which halves do I pull?

there's a ball bearing in the swash plate. It has an inner race, attached to the upper half (the one with four ball links), and an outer race connected to the lower half (the one with three ball links).

BTW, "fly around it" sounds like good advice for most problems.

[Tom Burgess]

BTW, "fly around it" sounds like good advice for most problems.

You could spend hours trying to find a problem like that. IMO that time is better spent on the sticks. Pretty soon you won't notice it is there.

[Tom Burgess]

Also remember that when trimmed properly a heli will lean right in a hover (upright). Maybe it has something to do with that?

[Richard H]

there's a ball bearing in the swash plate. It has an inner race, attached to the upper half (the one with four ball links), and an outer race connected to the lower half (the one with three ball links).

BTW, "fly around it" sounds like good advice for most problems.

Ah with you now. Guess I should just put it down to a 'quirk' of the heli then.

[Richard H]

Also remember that when trimmed properly a heli will lean right in a hover (upright). Maybe it has something to do with that?

Good point - never thought of that. If so, do pilots that fly 3d trim in a different way?

[Richard H]

Thinking about how it's trimmed - I can have different trim settings for each idle up mode. So if I set my normal mode properly for hovering, should I just take out any trim for idle up modes.

If I have a click or two of right aileron in hover then if inverted it might send it off to the left.

[Tom Burgess]

I'm not saying that is the answer but just that it maybe Richard, Im not too sure. Having said that, I dont get it with my Aurora, and come to think of it my 700 either. I guess it must be something in the 600 head as I have had 2 600's now and both did it. Only way I remedied it was using a cyclock. Even then it still did it slightly but I could of dialled it out with the cyclock. Now I dont notice it unless I'm looking for it. I gave up on trying to get my helis to fly like the sim a long time ago