Theory Of Flight
Terms in this set (62)
gross weight divided by area of lifting surfaces
gross weight divided by span
gross weight divided by the horsepower of the engine
the weight of the airplane on the ground
additional weight put on during flight
ration of actual load acting on wings to the gross weight of the plane
curvature of upper and lower surfaces
air being pushed down by wind because of lift
direction of the airflow in respect to the wing
angle of attack
angle at which the airfoil meets the relative airflow
center of gravity
where the weight acts, where the resultant weight passes ini every altitude
of the surfaces that do not contribute to lift
2 types of parasite drag
form drag, and skin friction
parts of the plane that produce lift
where does the air that flows on top of the wing go and why?
inward because the pressure on top is lower than its surroundings
where does the air that flows on the bottom of the wing go and why?
outwards because of the lower pressure around it
downgoing aileron causes too much drag creating yaw
nose of upgoing aileron is projected into the airflow, downgoing is streamlined
down going moves through a small angle, so the up going goes higher
thin layer of air sticking on the surface because air has viscosity
when 2 forces are equal and parrallel
distance from center, acting in opposite direction
shape of wing as seen from above
wash in/ wash out
wing is twisted so that the angle of incidence at the tip is less than at the root (stalls later)
auxiliary airfoils fitted to the leading edge. At high angles of attack the move out ahead of the wing
passageways built into the wing a short distance from the leading edge.At high angles of attack air flows through the slot to smoothen air
increase drag decrease lift
increase camber of the wing, better takeoff, permits steeper approach angles and lower approach and landing speeds
movement or rotation about the normal axis
when the plane is sideslipping and the longitudinal axis in not with is not aligned with the flight path
tendency to remain in straight level and return to this attitude
around the lateral axis, pitch stability, nose heavy, C og G is ahead of C of P
decreases longitudinal stability
size and position of the horizontal stabilizer, position of C of G
around the longitudinal axis (roll)
what achieves lateral stability
dihedral, sweepback, keel effect, proper distribution
angle at which each wing makes with the horizontal . purpose is to improve lateral stability
high wing planes only, one wings dips and weight acts as a pendulum bringing it back to stability
one wing that the leading edge slopes backwards (perpendicular to relative airflow)
stability around the vertical axis
what affects directional stability
fin, keel effect and sweepback to some extent
the tendency of a plane to rotate anticlockwise to the left due to the propeller rotating clockwise
descending blade has higher angle of attack during takeoffs and landing, more lift on the right makes the plane yaw to the left
precession in the plane
rotating wants to stay int eh same place, if forced to move precession occurs, (yaws sharply to the left when changes the altitude)
the point where the airflow pulls away
ratio of the speed of the body to the speed of sound
instruments connected to pitot static pressure system (static line)?
altimiter, ASI and VSI
which instrument is connected directly to the pitot pressure source?
what does the pitot tube provide?
dynamic pressure to the airspeed indicator
static pressure source
2, both on the sides of airplane, connected to the whole static line
what happens if the ASI is blocked?
turns into an altimiter
what happens if static pressure source is blocked in the climb?
it will underead,
what happens if static pressure source is blocked in a descent ?
the VSI will indicate less, the other 2 will overread
reading on the altimeter when it is set to 29.92
actual height above earth's surface
equivalent air speed
calibrated airspeed corrected for compressability error (with no winds its equals groundspeed)
corrected for instrument error
what is the effect on the rate of climb on an aircraft?
pushes out of the turn
pushes inwards, causes aircraft to turn
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