The dihedral of the wings of Aircraft aids In stability in t

The dihedral of the wings of Aircraft aids In stability in the: the pitch axis the roll axis the yaw axis Flow separation on the surface of wings causes increase in the drag due primarily to: increase in skin friction on the lower surface change In the upper surface pressure distribution due to separation separated flow becoming unsteady on the lower surface Aircraft equilibrium requires that: the sum of the forces be equal to zero the sum of the moments equal zero the sum of forces and moments be zero Maximum aerodynamic efficiency occurs when: the lift Is at a maximum value the drag is a minimum the ratio of lift to drag is a maximum Equating the Reynolds and Mach Numbers to prototype and model respectively: assures dynamic similarity justifies wind tunnel experiments with respect to prototype all of the above

Solution

1. roll axis

2.changes in the upper surface pressure distribution due to separation

3. sum of the forces and moments should be zero.

4 the ratio of lift to drag is maximum

5.to assure dynamic similarity and justifies wind tunnel experiments with respect to prototype.