The design and execution of a small-scale wind tunnel investigation of V-22 shipboard interactional aerodynamic phenomena is described. The objectives of the investigation were to quantify the aerodynamic disturbances driving the uncommanded roll response experienced by a ground turning V-22 on the deck of an amphibious ship during recovery operations of upwind rotorcraft. Over 100 hours of wind-on testing were conducted in the US Army 7x10 Wind Tunnel at NASA Ames Research Center, between October 2001 and April 2002. Major model hardware included the fabrication of 1/48-scale representation of an LHA class ship, as well as 1/48-scale powered models of the on-deck V-22 and three upwind aircraft representing a CH-46, a CH-53, and a second V-22. Principal measurements acquired include Particle Image Velocimetry measurements of the flow field and force and moment measurements of the on-deck V-22 response. An overview of the test approach and execution and a general discussion of the results obtained are presented.
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