Configuration effects on the lift of a body in close ground proximity

The lift developed by a body moving in close ground proximity can be affected significantly by the shape of the body and its height above the ground. The research described examines some of these effects analytically and obtains a two-dimensiona l body shape which has a maximum lift under a specific set of constraints. Experimental work which gives confirmation of the analytical technique and provides some insight into the lift developed by a three-dimensional body of small aspect ratio is described. It is shown that, for low heights and proper vehicle geometry, the two-dimensional analytical technique can be used to give an estimate of the threedimensional pressure distribution. The effects of end plates and of venting around the bottom of the vehicle also are examined, and the importance of minimizing such venting is emphasized.