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20 Cards in this Set
- Front
- Back
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The Pitch angle is known as the space between the chord line and the tip path plane which is also known as the...
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Mechanical angle
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As the Angle of Attack increases, the drag on the airfoil will?
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Increase
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Ground Resonance can occur on which type of rotor system?
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Fully Articulated
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As the cross sectional area of a passage decreases, the velocity of air going through that passage does what?
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Increases
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What is Newtons THIRD law?
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For every action, there is an equal and opposite reaction
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Drag can be best defined as?
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The retarding force due to ther resistance to movement through the air.
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The minimum drag speed on the R22 occurs at?
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53 KIAS
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Name all 3 rotor systems and their capabilities.
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Rigid: Feather Only
Semi-Rigid: Feather & Flap Only Fully Articulated: Feather, Flap and Lead Lag |
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What is sympathetic resonance?
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In the range of 60% - 70% main rotor RPM, the frequency of the main rotor rotation begins to interact with the frequency of the tail rotor rotation which can cause premature tail rotor drive shaft failure.
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What is Newtons SECOND law?
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Force = (Mass)(Acceleration)
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Name and explain the 3 types of drag...
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Induced Drag: Comes from deflection of the angle of attack and pressure differential between upper and lower surfaces. This DECREASES with airspeed.
Profile Drag: Comes from skin friction. This INCREASES with airspeed. Parasite Drag: Any body not producing weight. This INCREASES with airspeed. |
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A roll about the longitudinal axis is controlled by the?
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Cyclic
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If the helicopter rotates on its Vertical Axis, which flight control wold be used to correct for it?
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Anti-Torque Pedals
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As the speed of an aircraft increases, its Profile Drag does what?
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Increases
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What is the lift equation and what variables can we control?
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LIFT= (CL)(1/2p)(V2)(S)
We control Coefficient of Lift(CL) and Velocity squared(V2) |
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Name the vibration frequencies and what parts they're associated with...
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Low pitch frequencies: Main Rotor
Medium pitch frequencies: Engine High pitch frequencies: Tail Rotor |
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Angle of attack is defined as the angle between the chord line of an airfoil and the?
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Direction of the relative wind
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An Asymmetrical airfoil produces what compared to a Symmetrical airfoil?
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More lift for a given chord size
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Asymmetrical are "What" compared to Symmetrical airfoils?
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Less Stable
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If the helicopter rotates on its Lateral Axis, which flight control would be used to correct for it?
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Cyclic
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