Ok folks I have a problem with a new build and I am puzzled as to what to do to resolve the issue.
Heli keeps rotating nose left it's the pro version with align 780 gyro
On the ground with sticks at centre the tail is centered and the servo arm is at 90.
I have repeatedly done the limit check and all is fine with no binding.
I am using a Futaba 7c tx and 617 rx
Using opposite trim doesn't seem to help.
Any help greatly appreciated
Should be set up from the channel you plugged the gain wire into on the rx (ch 5). The radio has a gyro gain menu that you can change. Any gain from 50% to 100% is heading hold - below is for rate mode which will drift if you don't set up the linkage mechanically to stop it. Try 80% and see if that works then if the tail wags quickly, lower it till it stops. Or if the tail either doesn't wag or wags really slowly back and forth make it higher till it starts to wag quickly then back off a little.
Try looking up Finless Bob's videos too - he has some great setup vids if you need them. Or if I'm not making sense
I know a lot of people have had problems with the qc on these, hopefully you won't, but keep that in mind as well.
I don't know if you solved your problem, but one thing I was taught was that with rudder centered, arm at 90*, you should have 2-3* pitch in tail blades. Also assuming everything was built correctly, I would check for proper belt tension. Too tight or loose could cause either binding, or slippage respectively, which would prevent the tail from achieving proper rotor speed. Let us know if you've already solved your problem.
Hi mate been out of action for a week or two due to a wipe out.
It was caused by the vertical stabiliser mounting which has a pin that is supposed to locate through the tail mount and boom but for some reason it either wasnt long enough in the first place or has sheared off and caused the tail to rotate leading to a crash.
Metal version on order.
But when i do get it back up i will build in a little offset on the tail and see if that solves the issue.
....... The radio has a gyro gain menu that you can change. Any gain from 50% to 100% is heading hold - below is for rate mode which will drift if you don't set up the linkage mechanically to stop it.......
I would like to point out here that many posts talk about HH and rate settings on radios and make one error repeatedly ...
NOT all radios are 50% and above Heading Hold and 49% to less on rate mode.
There are many radios out there that actually have +0 up to +100% on Heading Hold and -0 down to -100% for Rate mode ...
Not saying this thread radio is that way ... but it pays to read the manual to make sure of what settings ranges are actual for the radio.
I now own a 780, so maybe I can better help trouble shoot your problem. Once the gyro initializes, if the light is green, you're in heading hold. If the light is red, you're in rate mode. I'm speculating here, but I'm guessing you are drifting in heading hold. Do you have any subtrim dialed in on your rudder channel? Also, verify that the gyro is set for the correct servo signal for your servo. Did you set the travel adjust through the gyro, or via your transmitter?
Those are the things I'd check first, if you are mechanically sound.
Haven't heard anything back from the guy as to whether he's fixed it ...
But will make a comment after reading last post ... Gyros HATE any trim adjustment you make on Tx ... that makes the Gyro hunt and drift or wandering can result.
Always let the Gyro hold the direction ... NOT you unless it needs input from STICK to correct or change direction.
I never thought about this until it was pointed out to me by an experienced Trex flyer ...
Right lads looks like the problem is solved, amazing what a good wipeout can solve. Lol
Anyway after repairing it ( and it was the cheap plastic vertical stabiliser mount that broke) I set the gyro up as the manual plus in rate mode then switched to HH mode and so far so good, now we just need some decent weather to fly.
Cheers all for your input and I will report back in a week or so weather dependant on the progress.