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Old 07-28-2005, 12:21 PM
  #9  
Tall Paul
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Default RE: Ground Downthrust

For a tail dragger, thrust effects on the ground depend on the relation of the motor to the wheel location on the ground.
On a typical WWI biplane, with the very short nose, tall landing gear close to the prop arc, steep ground angle, the overturning moment from the prop is huge!
You need up elevator before advancing the throttle to keep the tail on the ground.
Cubs are quite similar, but in the lateral axis. Landing gear too far forward, ground angle steep.
For a tricycle geared plane there's no problem, the nosewheel pushes the nose up.