Why are the main landing gears of any commercial aircraft angled upwards when landing?
by 
kuyakev
ANSWERS: 3
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The aircraft as a whole is pointed nose-up, this allows the rear wheels to hit the ground first to provide stability, then the pilot lowers the nose wheel so the plane can be fully grounded and steered. If he set down the nose-wheel first, the plane would be hard to control -- any small steering movement could be magnified into possible instability. Setting down the two rear sets first gives the best "platform".
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I think he was asking about this:
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I believe that the upward tilt of the landing gear 'bogies' is due to 2 reasons: 1) As the tires touch down, the drag force imposes a twisting moment on the bogies. If the front tires touched first, this would tend to lift the rear tires off the runway. By having the rear tires touch first, the twisting moment causes the front tires to drop towards the runway. 2) The rotation arc of the bogies provides travel for the suspension system on the landing gear to absorb and dampen the landing impact. . .
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