October 12, 201114 yr You really do not understand the relationship between irrotational potential flow and circulation and their inapplicability to this matter. Background. Circulation is a very fundamental thing with any lifting system:If one subtracts the forward velocity from the flow around a lifting wing, the result is a circular flow or vortex viewed from the wingtip. This circulation is up in front of the wing , down behind, forward beneath and aft above. The intensity of this vortex is proportional to the lift per unit of span. Of course, when the forward velocity is added back, there is no actual circle of flow except where this vortex "falls off" the wing at the wingtip.So, anything which increases velocity above the wing or retards or reduces velocity below will increase wing lift with no change in angle of attack, etc. A split flap works this way. The lift increment is about like 5 degrees of extra angle of attack. The flap can be anywhere under the wing but works best near the back.Can you explain how in the following figure extending the gear into the forward circular flow beneath the wing will speed it up? Your understanding of stabilty and control seem limited too. What does "more highly loaded fore plane than aft plane" actually mean? Gerry Howard
Create an account or sign in to comment