Mechanical Engineering Questions
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Air in the ______ is warmed by heat from Earth's surface.
Aircraft is stabilized by dihedral (wings level)- Too Much dihedral leads to an oscillatory condition called "Dutch Roll"
How aircraft returns to initial condition- Positive Dynamic Stability causes damped oscillations- Negative Dynamic stability causes resonant oscillations
Left Turning Tendency- Asymmetric Propeller loading- Noticeable at high angles of AttackDownward Propeller blade (Right Side) has a faster airspeed that upward moving blade- Causes a left Yawing force
- One wing stalls before the other - P.A.R.E--Power Idle-- Ailerons Neutral-- Rudder Opposite of turn-- Elevator Forward
Trim - helps relieve back pressure on the elevatorFlaps - used while approaching/landing, allows for increasing angle of descent while not increasing speedSpoilers - devices used to decrease lift and increase drag
Difference of pressure above and below the wingabove wing - low pressure, high velocitybelow wing - high pressure, low velocity
Determined by location of the center of pressure relative to the center of Gravity- Positive COG ahead of COP- Negative COG behind COP
Propeller blades are "twisted", with a higher geometric pitch at the root, and a lower pitch at the tip
Left Turning Tendency- Air pushed back from propeller follows clockwise spiraling path-Air hits left side of vertical stabilizer- Causes a left Yawing force
-Occurs at critical Angle of attack-Air Flowing over the top of the wing can no longer flow smoothly and it breaks away-Wing loses lift
- Load is a measure of how much force the wings must produce- Increases during turns- STALL SPEED INCREASES WITH LOAD FACTOR
Tendency of aircraft when disturbed from normal flight- -- Statically Stable- \ Statically neutral- | statically unstable
Total Drag is lowest at VglideDrag increases as airspeed increasesDrag increases as airspeed increases
Ailerons - Controls rolling motionElevators - Controls pitchRudders - Controls Yaw
Lateral Axis - controlled by elevator/stabilator (push/pull of yolk)
High Aspect Ratio - glides better- maximizes liftLow Aspect Ratio- more maneuverable- often faster
Vertical Axis - controlled by the rudder pedals
horizontal stabilizervertical stabilizerrudderelavator
Longitudinal Axis - controlled by the Ailerons (turning the yolk)