Helicopter Shaking

[dane]

Hi there!
I need your help. This happens every time I fly in any helicopter, from the workshop and self-made. I can't find anything that should cause it.
https://www.youtube.com/watch?v=qcbUdUz9FG0

[NiceGuy]

To much rps on the rotor? Reduce rotor rps to 30.

[RazerKeyboard]

maybe not even?

[RazerKeyboard]

or because it was hitting the roof of the hangar where the door sits

[RazerKeyboard]

WAIT i think its to small or idk

[MyDearBrutus]

I've been seeing this same issue as well, any amount of fine tuning doesn't seem to fix it, with small adjustment you can get it to stop shaking when you initially take off but after a minute or two of flight the shaking starts up again. Helis that have worked for a long time are shaking for me.

[Mindstormsman]

Your collective on the blades should be neutral, I had this issue a while back and that seemed to fix it. No clue whats going on with the workshop one's you've tried though

Also, with that many blades you have way more lift than that heli needs, I've seen gyros do weird things when trying to adjust collective on a heli with crazy amounts of lift

[Secret176]

How can i fix this thing ( because it happens to me too ) ??

[Ra-Ra-Rasputin]

Your gyro is borked, likely tilt left/right are reversed. Put the output of the gyro for it through a control inverter (literally nothing but a microcontroller that multiplies by -1).

This is happening because the gyro tries to tilt toward the right, gets confused because it tilts to the left, which you react to by tilting to the right, the gyro then overcommits, which causes a rather violent pendulum effect which ends up with you sideways or upside down.

It is unlikely for this to ever be caused by an engine putting out too much power, given that i've made helicopters that can lift upwards at 140m/s... and you do not need a neutral collective unless you're making a helicopter with a variable collective. Old-style helicopters with fixed prop attack can be made just fine, and extreme lifts do not cause instability that flips the copter.

[Arc]

Originally posted by Ra-Ra-Rasputin:

Your gyro is borked...

"Your" as in broken in-game gyro by default, yes. It is unlikely related to flipped roll axis.

It overcompensates roll, probably some minor instability or some out-of-bound error margin making it freak out for no reason and then it starts to oscillate and flip like the OP video suggest.

Thing is, this issue existed from the beginning and was also a reason why custom gyros do exist on Steam Workshop. The problem is that after certain update, it was simply made worse.

[Ra-Ra-Rasputin]

The in-game gyro works perfectly fine, i have used it in more than a dozen helicopters of extremely varied designs made over the course of about 2 years. It only has issues when you have variable prop alignment instead of a directly vertical lift vector... and even then it works, it just isn't optimized for the scenario.

This will happen with every single gyro given inverse input. I've seen this scenario happen with a wrongly wired RC copter as well. You know, a real, physical one.

[Secret176]

Idk how do you fix the gyro with numerical inverter..

[Secret176]

Could you build the mechanism of a perfect working jet heli like only the basics no hull or anything only the engine so i can learn from it

[Ra-Ra-Rasputin]

What's happening is that the gyro is controlling the left/right tilt of your helicopter in an inverse direction of what's intended.
Lead the logic from your stabilized roll to a numerical inverter(literally multiply the value by -1, as said) before linking it to the roll of your propeller, the issue should go away.

[Secret176]

It doesn't works it makes my heli go crazy...

[EvilKenevil]

Same here, made my helicopter start barrel rolling like mad