01-09-2016, 03:17 PM
1452170447-VTOLAircraft.ppt (Size: 942 KB / Downloads: 14)
PURE HELICOPTER
ADVANTAGES
Most Efficient Hover/Loiter
Low Downwash
Good Low Speed Maneuverability
Symmetrical Yaw Control
Low Empty Weight
DISADVANTAGES
Low Max Speed
Lowest Cruise Efficiency (Range)
Limited High Speed Maneuverability
Attitude Depends on Speed/Acceleration
Rotating Component RCS
Highest Vibration Environment
Complexity (2 Fixed Thrusters)
COMPOUND HELICOPTER
ADVANTAGES
Good Hover/Loiter Efficiency
Low Downwash
Faster Than Pure Helicopter
Good Maneuverability -- All Speeds
Attitude Independent of Speed/Acceleration
Symmetrical Yaw Control
No Anti-Torque Rotor Required
Reverse Prop Thrust -- All Speeds
DISADVANTAGES
Low Cruise Efficiency (Range)
Rotating Component RCS
High Vibration Environment
Increased Empty Weight
Complexity (3 Fixed Thrusters)