Exam (elaborations)
Propellers and Systems Week 1, 2, & 3 (1)
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Propellers and Systems Week 1, 2, & 3 (1)
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What precautions should you take before working on or rotating propeller? (5) -CORRECT ANSWER-1. mixture to cutoff
2. magneto switch to off
3. fuel selector valve to off
4. ground p-leads
5. remove spark plug leads
What is the propeller mounted to on low power engines? High power? - CORRECT
ANSWER-low: crankshaft
high: gear reduction system
What is the purpose of a propeller? - CORRECT ANSWER-convert engine brake
horsepower into thrust horsepower
What makes the AOA of propeller? - CORRECT ANSWER-chord line and relative
wind
When are the AOA and blade angle equal? AOA less than blade angle? - CORRECT
ANSWER-Equal: stationary and propeller rotating
Less: moves forward ( relative wind decreases)
Why is blade twisted so root has high AOA and tip has low AOA? - CORRECT
ANSWER-more even distribution of thrust
compensate for difference in rotational speed of blade
, Where is blade angle the lowest? - CORRECT ANSWER-tip
What are the 5 forces acting of a rotating propeller? - CORRECT ANSWER-1.
centrifugal force
2. torque bending force
3. thrust bending force
4. aerodynamic twisting force
5. centrifugal twisting force
Which force causes blade angle to increase and RPM to decrease? - CORRECT
ANSWER-aerodynamic twisting force
Which force causes blade angle to decrease and RPM to increase? - CORRECT
ANSWER-centrifugal twisting force
What are the hardwoods most commonly used for wooded propellers? - CORRECT
ANSWER-birch and ash
What is the minimum number of laminated layers for a wooden propeller? -
CORRECT ANSWER-5
Why are laminated layers preferred over solid wood? - CORRECT ANSWER-less
warp
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