Please provide some explenation with answer 1. What is the relative direction of

Question

Please provide some explenation with answer 1. What is the relative direction of the wind on a retreating main rotor blade of a helicopter flying slowly backwards in a no-wind condition? A. Upward C. Forward B. Downward D. Backward 2. An airfoil may stall due to A. a low angle of attack. C. high airspeed. B. heavy wing loading D. both A and C. 3. Which one of the following can result in the CG of the rotor moving off center? A. Ground effect C. Dynamic stability B. Blade tip stall D. Ground resonance

Explanation / Answer

1. upwARD

2.both A and C

3.GROUND EFFECT

average helicopter range is 6000-6600rpm

typical helicopter engine TBO is 800 hrs

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a solvent based cleaner

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