Exam (elaborations)
PROPULSION TEST 4 QUESTIONS AND VERIFIED ANSWERS
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PROPULSION TEST 4 QUESTIONS AND VERIFIED ANSWERS...
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Inertia starters on radial engines have wheel - ANSWER Hand crank, electricinertia that accelerates the wheel
Angle of attack - ANSWER Angle between the face of the blade section and
relative wind
Blade angle - ANSWER Angle between the face or chord of the blade section
and the plane in which the propeller blades rotate
Why do we use shielding on spark plug wires - ANSWER To prevent
interference with radio reception
Which circuit in the magneto will shock you
What are the other two circuits - ANSWER Secondary. Has high voltage.
Primary and Magnetic
Which piece in the magneto has primary and secondary components? -
ANSWER Coil. - Second coil has more copper turns
Going down a runway, relative wind angle ______ . - ANSWER Decreases
Torque
What helps prevent plane from rolling on ground
What helps prevent plane from rolling in air - ANSWER As the blade goes
right, the engine wants to go left.
Gravity and friction of tires.
Dihedral helps keep plane from rolling in flight.
P Factor - ANSWER "Asymmetric Loading" Propeller blade descending on
the right, producing more thrust than the ascending blade on the left. Down-
swinging blade has more left pulls the aircraft nose to the left
Constant speed prop
, What does it actually do to stay on RPM - ANSWER Keep blade at constant
pitch for best efficiency. Controlled by governor.
Prop automatically changes its blade angle to maintain a constant engine speed.
In straight and level flight, if engine power is increased, the blade angle
increases to make the propeller absorb the additional power while the RPM
remains constant.
Ignition Booster - ANSWER Aux starting method for magneto. When starting
engine, the crankshaft doesnt spin fast enough to produce the required coming
in speed for a magneto.
Ignition booster supplies DC from battery to primary of magneto
Impulse coupling - ANSWER Aux. starting method for magneto. Impulse
coupling is engine driven and provides high rotational speed to produce a
retarded spark. Coupling has spring that gets wound up and releases the
flyweights to give magnet high rotational speed needed to make a spark
Advantages: its mechanical.
Booster coil - ANSWER Aux starting method for magneto. Booster coil
provides a shower of sparks to the spark plugs until the magneto fires properly.
only works when key is on. once engine is started, the booster coil is no longer
needed
Disadvantage: does not retard spark so can NOT hand prop
Induction vibrator - ANSWER Supplies low voltage through primary coil,
giving high voltage in secondary for starting.
Disadvantage of magneto - ANSWER Has high coming in speed 100-200rpm
so it has to turn fast to work. Engine turns at lower speed than needed.
Where does ignition occur when not on the ground - ANSWER Ignition is at
compression
What do we call the twist on a prop
Why is there a twist on the prop - ANSWER Pitch distribution *2-4 degrees
either side*
To create thrust evenly
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