PLA-MKII
February 12, 2006 at 5:41 pm

Aerodynamics Question

Hi,

I have a question for fellow forum members:

If an aircraft pulls up for a roll does the nose of the airplane face greater Gs than further aft (and closer to the axis)?

Is that one reason why longer planes have problems with hard turns?

Would that mean that in a two seater the pilot at the back seat faces smaller G forces than the pilot at the front seat? (even if this is less than significant)>

Thanks in advance.

Cheers

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By: mixtec - 13th February 2006 at 22:29

Thanks for your reply. Is there a formula for calculating this segment of the overall g-force? If one built the cockpit at the center of lift inside something like a gyro (that is, turns on the vertical axis would be minimal) would the G-forces be relatively reduced?

The forumlas that Newton wrote for the laws of gravity and momentum are what apply to calculating centrifical forces. You should talk to your physics teacher at whatever school or university you go to. You will find that calculating such formulas is a lot more simple and straightforward than you think.

And as I already said, the forces created by an aircraft rotating on its axis (which are so small as to be negligable) are not related to the centrifical forces of an aircraft pulling a tight turn.

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By: PLA-MKII - 13th February 2006 at 15:56

The g-force would be the same no matter how far the pilot is postioned in relation to the center of gravity of the aircraft or the center of lift to the aircraft. The leverage forces due to your distance away from angle of rotation would be felt, but would be a very small increase/decrease to overall g-force, and is not directly related to the centrifical g-force of a turn.

Thanks for your reply. Is there a formula for calculating this segment of the overall g-force? If one built the cockpit at the center of lift inside something like a gyro (that is, turns on the vertical axis would be minimal) would the G-forces be relatively reduced?

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By: mixtec - 12th February 2006 at 18:32

The g-force would be the same no matter how far the pilot is postioned in relation to the center of gravity of the aircraft or the center of lift to the aircraft. The leverage forces due to your distance away from angle of rotation would be felt, but would be a very small increase/decrease to overall g-force, and is not directly related to the centrifical g-force of a turn.