Bell XV-3 Convertiplane in Ames Reseach Center 40x80ft subsonic wind tunnel; Rotor dynamic stability tests
XV-3 in Ames Reseach Center 40x80ft wind tunnel; Rotor dynamic stability tests
XV-3 from rear in Ames Reseach Center 40x80ft wind tunnel with K Edenborough and B. Ramsey
XV-3 in Ames Reseach Center 40x80ft wind tunnel with K. Edenborough and B. Ramsey, engineers Published in The History of the XV-15 Tilt Rotor Research Aircraft (from Concept to Flight NASA SP-2000-4517)