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If I land a glider at 60 miles per hour (ground speed)on a conveyor that is moving in reverse 60 miles per hour - I go nowhere...technically i will eventually go backwards if the conveyor does not change speed.

Actually, the plane would eventually stop (relative to the ground) due to wind resistance, but the plane would not roll backwards, because the bearings are frictionless. The plane would stay stationary with the wheels rolling at 60 MPH.

1992 montero, cranked t-bars, OME springs, 1-1/2" spring spacers, Homemade rear bumper and roof rack, 33" BFG AT, 1" body lift, Superwinch hubs, '95 SR locking rear axle, was AT - now V5MT1-3 5spd.