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75 foot-pounds aerodynamic moments acting aileron aircraft angular velocities aircraft motions Airfoil section modified angle of attack calm air changes were smooth chord configuration continuous level flight control deflections conversion flight conversion from forward conversion from hovering CONVERSION MANEUVER cruciform tail vanes decelerating conversion duct angle duct drive shaft duct moment shown duct pitching moments duct-induced downwash ducted fan ducts are rotated flight records flight to hovering Forward 50 forward flight guide-vane help offset history of hovering horizontal stabilizer angle horsepower Hovering and Vertical hovering descent hovering to forward include the relieving large control motions lateral stick motions longitudinal trim maintain continuous level NACA NASA pilots Nose nose-down trim setting nose-up pitching offset the nose-up oscillograph pressure altitude Rearward rotate the duct shown herein include shown in figure sq ft tilt-duct aircraft TILT-DUCT VTOL tilt-wing tilting-ducted-fan torque trim changes trim variations type of aircraft uncontrolled-for vertical descent VTOL test