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SIFT study guide Exam/93 Complete Accurate Questions and Answers
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SIFT study guide Exam/93 CompleteAccurate Questions and Answers
The four forces acting on helicopter in forward flight are...? - -Thrust, drag,
weight, lift
-Bernoulli's Principle or the "venturi effect" - -As air flows over upper surface
of airfoil, camber (curvature) of airfoil causes increase in speed of airflow
which decreased pressure. Pressure is increased on bottom and this gives
lift.
-Newtons Third Law of Motion and how it applies to helicopters - -"for every
action there is an equal and opposite reaction"
*small amount of lift is provided by the rotor blades lower surface deflecting
air downward, thus having a small force upward
-Weight is overcome by ______ and this is accomplished by increasing the
____ _____ of the main rotor blades. - -thrust;
pitch angle
-The tail rotor produces thrust and is variable through use of antitorque
pedals which control the helicopters _______. - -yaw
-Drag always acts parallel to the relative _______.
Total drag is composed of three types of drag.... - -wind
profile, induced, parasite
-What is Parasite drag? - -any "parasite" on the aircraft that creates a drag.
Ex: low air pressure in tires, skin friction (rough surface that creates
resistance)
-What is profile drag? - -drag produced by shape of the aircraft
-What is induced drag? - -when at the back of the wing, air flowing fast over
the top meets air flowing slowly underneath.
-Newtons First Law of Motion states that.... - -an object at rest will stay at
rest, and in motion will remain in motion at constant velocity unless acted
upon by an unbalanced force
, -Four Types of Friction: - -1. Sliding/Kinetic Friction
2. Fluid Friction (through air or water)
3. Rolling Friction: when object rolls instead of slides across surface
4.Static Friction
-Newtons Second Law of Motion states that... - -When object is acted upon
by constant force, its resulting acceleration is inversely proportional to the
mass and directly proportional to the applied force
F=ma
-Newtons Law of Universal Gravitation equation - -Fg=(Gm1m2)/d^2
G=gravitational constant=6.67x10^-11
-Two objects a distance of "d" apart. What happens to force b/w the two
objects if you increase d by a factor of 4? - -You decrease the force by a
factor of 16
-Aircraft weight and balance: what does each acronym stand for and mean?
1. MEW
2.OEW
3. AUW
4. MLW
5. MZFW
6. MTOW
7. MRW - -1. Manufacturers Empty Weight: total weight of aircraft as it was
built and meant to fly, and does not include fuel or fluids, passengers or
other things
2. Operating Empty Weight: the MEW + weight of crew, fluids, unusable fuel,
and equipment required for flight. Does not include baggage, passengers or
usable fuel
3. All Up Weight: (aircrafts gross weight)total aircraft weight at any given
moment during a flight. Decreases as flight time proceeds (fuel is depleted)
4. Maximum landing weight: weight limit for landing. exceeding may harm
landing gear
5. Maximum Zero Fuel Weight: limit weight of an aircraft with its contents
and includes unusable fuel...excludes weight of usable fuel and consumable
liquids on board
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