BG helicopter

[Chciko]

I have made a helicopter that works except for one part.  Once it gets up if it rolls one way i cant get it to roll back without changing the pich of the intire copter.  How would i fix this problem??

[snekyboi]

probably you should add some elevons or any kind of pitch and roll controlling devices in the aerodynamic section. it would also help to look at the center of mass of the helicopter, that too the thrust and aerodynamic overlays.

[Chciko]

Its till rolling and i can roll it back when it does.   Ive added elevons and made ot so only the comand pod amd elevons control pich yaw and roll

Edited January 6, 2020 by Chciko
Unfinished

[Vanamonde]

Did that fix the problem? And your question has been moved to Gameplay, since it's seeking help rather than offering it. 

[Chciko]

No it didnt and im also on ps4 in enhanced edition.  

[HvP]

Helicopters are diabolical, and I can't pretend that I've figured out how to make a properly functional one in KSP but:

As I understand it, it's recommended to right-click the prop blades and disable their pitch, yaw and roll control inputs. Of course, this assumes that you are using something other than the props to control these axes, such as reaction wheels, a tail rotor assembly, and/or ailerons.

Edited January 6, 2020 by HvP

[Zeiss Ikon]

24 minutes ago, HvP said:

Helicopters are diabolical

This is also true in real life.  There are many very good fixed-wing pilots who just can't learn to hover, because it requires a fourth continuous control input (throttle, collective, two cyclic axes, and rudder, vs. throttle, roll, pitch, and yaw).  One way I've seen it referred to is that "Every airplane out there wants to fly.  A helicopter does not."

[Just Jim]

@Zeiss Ikon

 

 

Edited January 7, 2020 by Just Jim

[Rpatto92]

On 1/6/2020 at 3:22 AM, Chciko said:

I have made a helicopter that works except for one part.  Once it gets up if it rolls one way i cant get it to roll back without changing the pich of the intire copter.  How would i fix this problem??

Just made a guide for exactly this purpose, go check that out for more info. However, what you're dealing with (by the sounds of it) are two phenomenon; one's kind of bug and the other is just helicopter aerodynamics. 

So the non-bug first... Helicopters are fundamentally asymmetric, even if you're building a tandem or coaxial rotor. If either of those contra-rotating rotors are not equidistant from the centre of mass, the result is a net force in the roll axis as forward velocity increases. If you're building a single-rotor that asymmetric lift has to be accounted for another way, using rotor articulation and adjusting the height of the tail rotor. So, the roll your trying to roll out of, is most likely that.

The bug... There's a bug or untended feature I've noticed when blades or control surfaces are too close to the centre of spin/centre of mass in the horizontal plain. Control surfaces become inverted and rotor blades get some weird control input mixing/inversion, that means pressing up/down will induce roll left/right and vice versa. 

The solution is to move the blades or control surfaces away from the centre of mass/spin. So, move them out from the centre of spin, put them on a bigger rotor hub or just offset them.

Anyway, there's more detail to be found in this thread I posted.

here's a link: 

 

hopefully, you're still active. It's taken me a long time to figure all this stuff out and finally make a post.