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Details Title: HELICOPTER 2 Description: TEST 2 Total Flash Cards: 36 Created: 05/29/2008 12:03:00	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term During flight, if cyclic control pressure is applied which results in a maximum increase in pitch angle of the rotor blade at position A, the rotor disc will tilt. Definition forward Term The lift differential that exists between the advancing main rotor blade and the retreating main rotor blade is known as Definition dissymmetry of lift Term During forward cruising flight at constant airspeed and altitude, the individual rotor blades, when compared to each other, are operating Definition at unequal airspeed, unequal angles of attack, and equal lift moment Term When a blade flaps up, the CG moves closer to its axis of rotation giving that blade a tendency to Definition accelerate Term During a hover, a helicopter tends to drift to the right. To compensate for this, some helicopters have the Definition rotor mast rigged to the left side Term Which is a result of the phenomenon of ground effect? Definition The angle of attack generating lift is increased Term Translational lift is the result of Definition airspeed Term The primary purpose of the tail rotor system is to Definition counteract the torque effect of the main rotor Term If RPM is low and manifold pressure is high, what initial corrective action should be taken? Definition Lower the collective pitch Term WHAT IS AN apparent deflection of moving objects when they are viewed from a rotating frame of reference? Definition Coriolis effect Term The purpose of the lead-lag (drag) hinge in a three-bladed, fully articulated helicopter rotor system is to compensate for Definition Coriolis effect Term What is the rotor blade rotating away from the direction of flight stalls? Definition retreating blade stall Term what is an uneven amount of lift on opposite sides of the rotor disc? Definition Dissymmetry of lift Term Rotary-wing aircraft to move so quickly that the retreating blade no longer moves fast enough relative to the air to provide lift is called? Definition retreating blade stall Term What is the minimum speed at which the airfoil must move through the air to generate lift called? Definition stall speed Term The air flowing past the top of the wing of an airplane, or the rotor blades of a helicopter, is moving much faster than the air flowing past the under-side of the wing or rotor blade. The air pressure on the top of the wing or rotor blade is much lower than the air pressure on the under-side, and this explains the origin of the lift force generated by a wing or rotor blade to keep the airplane or helicopter in the air. What principle is this? Definition Bernoulli's principle Term When a fixed-wing aircraft drops below its stall speed, the entire aircraft loses lift and enters a condition called? Definition a stall Term what are some causes of a retreating ?blade stall Definition -High gross weight -High airspeed -Low rotor RPM -High density altitude -Steep or abrupt turns -Turbulent ambient air Term What is A standard rate turn for (light) airplanes? Definition 3° per second turn, which completes a 360° turn in 2 minutes Term The maximum forward speed of a helicopter is limited by Definition retreating blade stall Term When operating at high forward airspeeds, retreating blade stalls are more likely to occur under which condition? Definition Steep turns in turbulent air Term While in level cruising flight in a helicopter, a pilot experiences low-frequency vibrations (100 to 400 cycles per minute). These vibrations are normally associated with the Definition main rotor Term Select the helicopter component that, if defective, would cause medium-frequency vibrations. Definition Tail rotor Term The principal reason the shaded area of a Height vs. Velocity Chart should be avoided is Definition insufficient airspeed would be available to ensure a safe landing in case of an engine failure Term What control makes the helicopter increase or decrease in altitude? Definition Collective Term What controls the power produced by the engine? Definition Throttle Term The result is to tilt the rotor disk in a particular direction, resulting in the helicopter moving in that direction. If the pilot pushes the _________ forward, the rotor disk tilts forward, and the rotor produces a thrust in the forward direction. If the pilot pushes the ________ to the right, the rotor disk tilts to the right and produces thrust in that direction, causing the helicopter to hover sideways or to roll into a right turn during forward flight. Fill in the blanks with one word? Definition cyclic( control forward and back, right and left movement) Term What is used to control nose direction or heading? Definition pedals(to maintain balanced flight) Term 1. Cyclic (lateral) 2. Cyclic (longitudinal) 3. Collective 4. Pedals DEFINE ALL? Definition Used in forward flight- 1.To turn the aircraft 2.Control attitude 3.To adjust power through rotor blade pitch setting 4.Adjust sideslip angle Used in hover flight- 1.To move sideways 2. To move forwards/backwards 3.To adjust skid height/vertical speed 4. Control yaw(motion about its vertical axis) rate/heading Term During surface taxiing, the collective pitch is used to control Definition rate of speed Term During surface taxiing, the cyclic pitch stick is used to control Definition ground track Term With calm wind conditions, which flight operation would require the most power? Definition A left-hovering turn Term Which flight technique is recommended for use during hot weather? Definition During takeoff, accelerate slowly into forward flight Term Which action would be appropriate for confined area operations? Definition Plan the flightpath over areas suitable for a forced landing Term If possible, when departing a confined area, what type of takeoff is preferred? Definition A normal takeoff from a hover Term If the pilot experiences ground resonance, and the rotor RPM is not sufficient for flight...? Definition apply the rotor brake and stop the rotor as soon as possible