INVESTIGATION OF TILTING DUCT AND FAN-WING IN TRANSITION FLIGHT
MASSACHUSETTS INST OF TECH CAMBRIDGE AEROELASTIC AND STRUCTURES RESEARCH LAB
Pagination or Media Count:
A study of the ducted fan as a lifting device in forward flight, as a tilting duct and as a wing enclosed fan showed that significant changes in lift and power occur when inlet separation occurs that sizable crossflow exists in the duct in all cases that an increase in lift and power and a decrease in drag occur with forward speed after inlet separation is established which cannot be accounted for by momentum considerations alone. In the case of the fan-wing, the lift curve slope and stability derivative are not changed by the fan operation. A comparison of an articulated and a rigid rotor does not show significant changes in total pitching moments. Comparatively less lifting power is required under similar conditions for the fan-wing than for the tilting duct. Additional force, velocity and pressure data are presented.
- Fluid Mechanics