R44 II Aerodynamics
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What are the 3 types of drag?
- Profile drag: Shape of the airfoil
- Induced drag: Vortices coming off the blades
- Parasite drag: non-aerodynamic objects on the aircraft
During an autorotation how is lift created?
Instead of the air being pulled from above the blades and pushed down, the air is forced through the blades from below.
During an auto rotation what performances degrade first?
- Altitude is the 1st to go
- Airspeed is the 2nd to go
- RPM is the last to go
What forces cause coning?
What is a cause of coning?
Coriolis effect (the ice skater)
How does the R44 II counter the coriolis effect?
R44 II has an under slung hub
What does a low vibration refer to?
What does a medium vibration refer to?
What does a high vibration refer to?
What is a R44s Sympathetic Resonance
When the tail rotor and main rotor are in sync with there freq. vibration
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