new control surfaces weirdness

[SofusRud]

This is something I've noticed whilst rebuilding my big cargo SSTOs for the new version. My cargo SSTOs all use a set of custom canards, usually a set of delta wings with control surfaces out in the front of the plane, and since the wing parts all go replaced I've been noticing some weird behavior from the new control surfaces.

To demonstrate what I mean I have the following images:

Picture 1. is of a demonstrator with a small delta wing and a control surface both in front of and behind the center of mass. Once loaded onto the runway I pitch up.

Picture 2. is basically identical, except I've replaced the delta wing and control surface in front of the COM with a Standard Cannard, an "old" part.

You'll notice that in Picture 1. the wing parts in front of the COM exhibit the exact opposite behavior of the parts in the same position in Picture 2. Pitching up causes the new control surfaces to pitch down when in front of the COM. What's more is that I'm 100% sure that the old control surfaces didn't use to act this way.

I'm not asking for the old control surfaces back, but I hope this wasn't intentional and simply a bug that wasn't caught pre-update. My entire fleet is grounded until this can be sorted out, so if either SQUAD changes this or if someone else has a workaround it would be much appreciated.

[luizopiloto]

it's working as intended for me...

[Franklin]

[monophonic]

Your craft will rotate about its CoM, so yes, the new surfaces are still pitching the way they need to turn your craft where you want. It pitches up by making the tail go down and the nose go up. Watch where the rear end of the canard / forward control surface goes: They both turn the same way.

Thus, yes, the forward control surfaces do look like they deflect wrong way. It just the way aerodynamics works that they have to turn that way in order to actually work the right way.

[Lifeforce87]

I don't see any problems there.

[problemecium]

Yeah, that is the "normal" behavior. The canards don't actually behave in any special manner compared to standard flaps, as can be seen if you put a canard near the back of a plane (I frequently use one as a tail fin).

[Alshain]

I don't see the problem here either. That's exactly how they are supposed to work. It's going to be opposite in front of the CoM from what it is behind the CoM.

The reason is to go up your pushing down on the back of the plane and up on the front of the plane. Likewise, to go down you push up on the back of the plane and down on the front.

If the old parts didn't work that way, then maybe it was a bug fix, because this is the right way.

EDIT: Picture is worth 1000 words (blue is air movement, yellow is rotation effect)

Edited October 15, 2014 by Alshain

[SofusRud]

I seem to have made a fundamental misunderstanding of how this stuff works. That's embarrassing.

mods please close.

*slinks off in shame

[Alshain]

I seem to have made a fundamental misunderstanding of how this stuff works. That's embarrassing.

mods please close.

*slinks off in shame

Nothing to be ashamed about, this is aerodynamics, it's not like it's something easy like Rocket Science.