by mtaylor » Fri Apr 16, 2010 6:18 pm
From my learnins, biplanes don't use wash out. With both wings flat and at the same angle of incidence, in flight the lower wing causes the upper to have a higher angle of incidence relative to airflow. That causes the upper wing to stall first and give the same basic effect as wash out; that is, creating a gentler stall and leaving the lower wing ailerons effective.
If you use metal leading edges, I would think you can rig the wings level to a degree. You may experience some deforming of the leading edge metal if you're too far out of plumb. If you use ply, better lay 'em straight when you're gluing them up, cause they aint moving when your done. They are stiff! I know of a guy who first mounted and rigged his Waco wings to the fuselage before he glued on his wooden leading edges. But then, it was a taper wing Waco and they are a b*#@ch to level on a table.
Mark T
#493
From my learnins, biplanes don't use wash out. With both wings flat and at the same angle of incidence, in flight the lower wing causes the upper to have a higher angle of incidence relative to airflow. That causes the upper wing to stall first and give the same basic effect as wash out; that is, creating a gentler stall and leaving the lower wing ailerons effective.
If you use metal leading edges, I would think you can rig the wings level to a degree. You may experience some deforming of the leading edge metal if you're too far out of plumb. If you use ply, better lay 'em straight when you're gluing them up, cause they aint moving when your done. They are stiff! I know of a guy who first mounted and rigged his Waco wings to the fuselage before he glued on his wooden leading edges. But then, it was a taper wing Waco and they are a b*#@ch to level on a table.
Mark T
#493