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Biplane Lift Distribution - What’s Happening Here?

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Tiger Tim

Well-Known Member
Joined
Apr 26, 2013
Messages
7,176
Location
Thunder Bay
I saw this pic elsewhere and it has me puzzled:
1693625009574.png
The Tiger Moth was described as being in a tight left turn at high speed (lol) when it was taken. Just look at it: the fabric on the lower wings is ballooning up as you’d expect but on the upper wing it’s pressed down so hard you can see the rear spars. I don’t have the rigging instructions for a Tiger Moth on hand so I can’t tell you what the incidence difference is between the wings.

Still, what gives? Is that upper wing really working against the lower and if so, why?
 
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