Effect of crosswind on fixed wing field performance

[MobiusTrip]

Ummm, ok - I don't know about that - what's your reasoning behind the AC having more drag if the wing is lifted by the crosswind?

Perhaps it is suitable to think about looking at the AC head on as it accelerates toward Vr. Generally speaking, the more of the AC you 'see' the more drag there is (form). I can't see why a wing being lifted up by the crosswind would give more form, but I can see how a deflected spoiler would?

We might be barking up the wrong tree entirely here - perhaps the dominant factor (for the AC under consideration) is in fact the requirement to apply asymmetric braking (with consequent effect on accel) due to asymmetric main wheel load/drag vice the effect of spoiler drag?

I haven't ever completed (or even seen the results of) a trial with/without into-wind controls on take-off performance - anyone else done/see this? I have, however, always applied into wind stick/yoke in every AC I've flown on take-off (as far as I can recall) - because that's what I was taught to do from day one.

I'm not going to get to sleep now stilton!!

MT :-)

edited because I suddenly realised what you meant! I suppose it would be a toss-up between the drag from the 'lifted' wing and that from a spoiler to keep it down, perhaps? However, the wing is being lifted (in some respects) in a different way to 'normal' wing lift because, amongst other things, the side fin force is 'tilting' the AC. As the AC accelerates, the 'lifting' force becomes more conventional (due to the RAF).