plane rolling

[g.koster]

I have at the moment the problem that my planes are rolling.

build absolutely symmetrical reaction wheels and two cockpits. vertical reaction services.

activated T

I just accelerate over the run way and get up plane is slowly rising and horizontal and then the plane start rolling left site down. rather quick.

and this is not the first plane I have problems with rolling left site down. be the clearest.

any reason

[zekes]

it might be because the aircraft is too weak, and so it flops around, which might make it fall off a wing to the left. also, could be you have a surface that is not stright, which turns the craft. Or something is clipping inside the plane.

[LaytheAerospace]

I've run into this a lot. Turn on the CoM/CoL balls and see if they're out of line. I've seen some really unexpected stuff where wings bugged out and didn't provide lift until being removed and re-added, though I've also seen it be much more subtle and not been able to detect a misalignment. Typically I fix it by yanking off one of the wings and putting it back on in symmetry mode to make sure everything's correct.

[Corw]

It is common problem with wheels. They have to be perfectly parallel and quite often they are not. Extra problems with heavy planes where wings or whatever supporting the wheels bends 'cause of weight.

[g.koster]

Its not flopping around quite a small plane, as for clipping, there is no clipping of parts as far I know esspically no part that are not connected, also clipping effect should be semetrical.

also with manual control i can correct and over correct the rolling. till I loose it.

[Megalodon 720]

Can you post a picture of the craft?

[g.koster]

I would like but somehow I can't

[FleshJeb]

Perhaps it's a trim control problem? Try hitting Alt-X before you take off, and that will reset the trim to neutral.

[Wanderfound]

Screenshots. From the top and the side, in the SPH with CoM/CoL/CoT indicators turned on.

We can't help you if we can't see what we're dealing with.

F1 to take a screenshot, then chuck 'em on Dropbox or Photobucket or somesuch.

[g.koster]

hope this wii give a screen shot

tryed with alt X both before starting and just after leaving run way didn't work

[Motokid600]

No, you need to take that image file and upload it. Imguar, photobucket..

[g.koster]

It could have had to do some ting with or engines above centre of mass or to far out. though both shouldn't have been given this result.

sorry from here no direct setupped acces to something like that

[LaytheAerospace]

Upload the picture to one of these places and then post it here.

http://imgur.com/

http://www.photobucket.com/

https://imageshack.com/

https://www.dropbox.com/home

[g.koster]

no idee if this did work for screenshots

[g.koster]

maybe this worked better

[Wanderfound]

https://www.dropbox.com/s/xzxbyl12362cv4i/screenshot2.png

https://www.dropbox.com/s/j24mfu997sm0ur2/screenshot0.png

maybe this worked better

Try this:

I'm not surprised that it's a bit rolly. You have a huge amount of weight stuck out on the wingtips. The mass of those engines and intakes is adding to the momentum of any rolling motion making it harder to damp out.

The best solution would be to shift that weight close to the centreline, but if you're determined to keep them out there you may be able to compensate with some dihedral on the wings.

Edited August 1, 2014 by Wanderfound

[g.koster]

Yes that I can understand. But that wouldn't explain why its rolling already on the strait. It only should make it more difficult to stop an existing rolling motion. and this I still can correct with manual stearing. so its not an overload of automated corrective measures.

Can it be that the SAS system is slow in responding and not correcting anough when the momentum is high.

[Wanderfound]

Even when you're flying flat and level, there's always a little bit of wobble. On a good plane, this wobble will be so small that the control surfaces and/or SAS damp it out before you even notice it. In this case, I think that the engine weight is overwhelming the plane's ability to correct. You don't have a lot of roll-relevant control surfaces (just the outer ones on the wings) and those engines have a lot of leverage when they're out that far.

Using the right-click tweakables to crank the control authority of the outer control surfaces to maximum may be helpful.