The edge of a wing at which the air stream leaves the surface.
Landing gear.
Cord winding on the struts.
An aeroplane with three superposed wings.
The eddies or discontinuity caused by a body or surface passing through the air.
U
USEFUL WEIGHT. The difference between the total lift and the dead load. This comprises the pilot and passenger, the weight of the fuel, baggage and instruments.
UNIT LOADING. The weight per square foot of main wing surface.
V
VOL PLANE (Fr.)