Posted by Charles (220.127.116.11) on November 01, 2005 at 23:25:59:
In Reply to: Landing gear position posted by John Singer on October 30, 2005 at 08:34:06:
You are correct in assuming that there is a critical relationship between the center of mass and the location of the main gear. In conventional geared aircraft, the closer the center of mass is to the location of the main gear (horizontally), the easier the ground handling. The biggest consideration is to locate the main gear far enough forward to prevent the aircraft from tipping over on its nose after you climb out of the rear cockpit.
Moving the center of mass forward of the main gear leads to extending this thought process even further i.e. tricycle geared aircraft are very stable in ground handling.
There are other considerations such as the amount of elevator deflection required to offset the moment arm created between the gear and the center of mass, thereby lifting the tail. The more aft the location of the center of mass in relationship to the main gear will also cause a greater tendency for the nose to pitch up on a landing in which the vertical velocity has not been reduced to zero (it makes us bounce).
Every thing about an airplane is a compromise.
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