Slats wobbling on ground... and wingtip vortex while standing on carrier

[Snailman 517]

Hi... I need a little help with this. The plane is apparently having a little FM bug... I admit I changed a lot, and not a specialist of it. A mixture of aerodynamic from similar planes. But so far everything else is OK with the plane, but this.

 

The leading edge slats are wobbling, shaking while the plane is on ground. When it is on a carrier, and the carrier is moving (50-60kmh) there is also a little wingtip wortex visible.

 

 

I believe there is something angle of attack related.. It would be also better if the plane would not stall that much at low speeds (VTOL mode) because it is too sensitive to thrust settings (((

Thanks in advance...

 

 

PS. skin is only 50% complete.

[Race 0]

Interesting, I have noticed this as well on airplanes with carnards on the ground and in the air.

[ArturR 17]

Try entry

FullyDeployOnGround=TRUE

 

in slat sections

[MAKO69 186]

The wingtip vortex should be visible at that speed.

[Wrench 9,847]

SmoothDeployment=TRUE

 

you can try that, too

[Snailman 517]

Thanks to everyone... I try them out... Although I had no such problems with the Yak-38.. it is a stock FM tho..

[Snailman 517]

No luck... SmoothDeployment makes them always open... even at M1.7 FullyDeployOnGround should be useful, but looks odd when the wings are folded. Since they are Angle of attack activated, it must be somehow fligh model related. But whatever I change it still does it.

Maybe a model related problem?? The original INI had them as manual blowback (??) at 20 degs. I added angle of attack with two stage 10 and 20 degs.

[Fubar512 1,350]

The "smooth deployment" declaration does force any surface to stay open.

 

What's causing your issue, is either improper control surface data tables, or (more likely) the ships data.ini being set to induce a flight deck pitching moment that's more appropriate to sailing into 7-meter waves, than the "flat" seas that the water shader would lead one to expect. That excessive pitch moment is allowing the FM to exceed the AoA or G-force settings of the slats and wing vortices.

 

The fix is simple. Extract the data.ini for the effected ship model, and zero out the value on this declaration: SuspensionConstant=0.0

Edited February 19, 2013 by Fubar512

[Snailman 517]

What's causing your issue, is either improper control surface data tables, or (more likely) the ships data.ini being set to induce a flight deck pitching moment that's more appropriate to sailing into 7-meter waves, than the "flat" seas that the water shader would lead one to expect. That excessive pitch moment is allowing the FM to exceed the AoA or G-force settings of the slats and wing vortices.

 

Huh... I had some experiments.. Yes it is indeed something induces G-force in the plane. It is not coming from ship data, it does in on runway too.

First I thought that the undercarriage does it, because I had to fix the spring factor due to carrier take-off crash bug. But no, the original unfixed plane does it, too.

so, the symtoms... if I give about 50% thrust, the wobbling stops... so it is indeed a stall/ AoA problem. Also it causes the plane to stall easier when flying very slow (VTOL).

But what makes it?? And where to look and what else to change? I tweaked almost all variables but nothing seems to have effect on this (((((((

 

Ops. well I noticed that the vert stabs are not in level while standing on ground.... BUT, is that a symtom only or the illness itself?? Data INI variables show nothing erratic...

Edited February 24, 2013 by Snailman