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View Full Version : Help! leading edge of wing and fusulage relation


garrcass
Jan 02, 2008, 02:04 AM
if the leading edge of a straight leading edge wing was crooked not 90 deg to the fuseulage could it cause wered flight if the wings leading edge was more forward on the right side of the plane and more aft on the left side of the plane would it cause the plane to want to drop the left wing and rase the right ?

slipstick
Jan 02, 2008, 04:18 AM
Think of it the other way round. The wing always tries to fly straight....so what you're saying is that, relative to the wing, the whole fuselage is slanted to the left at the back and so acting like a great big left rudder. What do you think will happen if you fly with permanent left rudder ?

Steve

Brandano
Jan 02, 2008, 04:42 AM
Hmm, so the situation is as if one wing was swept and the other had a negative sweep? IIRC negative sweep wings tend to have slightly better stall behavior, as long as their structure is rigid enough to avoid wing twist. I think the swept wing would stall slightly earlier, or further out from the fuselage. I think that it would tend to roll to the left. Btw, ever seen this plane? http://en.wikipedia.org/wiki/NASA_AD-1

MarkusN
Jan 02, 2008, 01:07 PM
The leading edge can be crooked without adverse effects (as the NACA "scissor"-wing proves). However, if your wing has dihedral and as a whole is turned on the fuselage, that causes the "front" wing to have slightly higher AoA (that's the very effect that makes flying with only rudder possible on planes with dihedral). So the effect would be exactly as you fear.

BMatthews
Jan 02, 2008, 01:34 PM
If it's not much and there's no dihedral at all then you'll notice that it'll fly OK but it'll tend to do some maneuvers differently from right to left. If it's a LOT of angle then the model likely will have enough issues that it won't be fun to fly.

If it's skewed like this and has dihedral then it'll be a big issue even with just a little skew. It would need to be fixed for sure then.

How much it's out matters as well. If you're talking about 1/4 inch for a 50 or 60 inch span then you likely won't notice it, dihedral or not. But much more of a % than that and it'll start to have an effect. More so if there's dihedral involved.

HELModels
Jan 02, 2008, 02:05 PM
If the tail is square to the wing while the wing is skewed to the fuselage, then it will look like it is in a sideslip. I had a plane that was built crooked like that and that was how it would look coming at me, even though it was flying straight. As BMathews mentioned, it will depend on how bad it is whether it will be flyable or not.