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Table Of Contents

184 RIGID BODIES

DYNAMICS

RIGID BODIES 185

Double-Sided disabled. Since the

normal is facing away from the

wind, the wind is unable to exert

a force on the surface.

Double-Sided enabled. This

guarantees that a normal will

face the wind and hence the

wind is now able to exert a force

on the surface.

Double-Sided disabled. The wing

is experiencing a lifting force.

Double-Sided enabled, causing

equal and opposite forces for

each surface and hence no

resultant force. For this reason,

Double-Sided should be disabled

for closed polygons.

Lift

This setting denes the strength of lift. When an airstream passes over a surface,

the air pressure will drop. The faster this airstream, the lower the pressure. When

designing a wing, the wing must be shaped so that the air stream will pass over one

wing surface more quickly than over the other wing surface. This will create a pressure

gradient, causing the wing to experience a lifting force.