Performance Flashcards
Thrust from a propeller is greatest when the aeroplane is?
stationary
shaft power/brake power =
indicated horsepower - frictional losses
thrust horsepower is?
brake horsepower accounted for propeller inefficiency
power required is directly related to the
total drag
For a prop aeroplane, best range is achieved at what speed?
The speed for minimum drag, or, the best lift/drag ratio speed
The speed for best endurance is the speed that requires?
the minimum amount of power, or, Vmp.
The speed for best rate of climb can be found at the speed for
the best lift/drag ratio
Relevant to the power curves, the best angle of climb speed is found?
where the distance between thrust available and thrust required is greatest
Relevant to the power curves, the best rate of climb speed is found?
where the distance between power available and power required is greatest
The trig formula for angle of climb
sin = T - D / W
Regarding climb performance:
any increase in weight will result in a -
flatter flight path with a reduced rate of climb at a higher speed.
The trig formula for the gliding angle is
Tan = D / L
The best glide speed will always be found at the speed for -
maximum lift/drag ratio
Does an increase in weight affect the gliding angle
No, since it depends on the lift/drag ratio.
Note: The lift/drag ratio is independent of weight. An increase in weight needs a corresponding increase in total lift and, consequently, a greater lift and drag will result. The proportions remain exactly the same and the L/D ratio and glide angle thus remain unaltered.
Does an increase in weight affect the gliding time?
Yes
the centre seeking force of a spinning object is called?
centripetal force
the opposite and equal force to centripetal force is called?
the centrifugal force
For aerodynamics, centripetal force is called?
the horizontal component of lift
Centripetal force is directly ? to the ? of the body, the ? of its ? and ? proportional to the ? of the turn.
Centripetal force is directly proportional to the mass of the body, the square of its speed and inversely proportional to the radius of the turn.
Steep turns are considered to be in excess of
45 degrees
Centripetal force in pounds =
W V^2 / g r
How to calculate the stalling speed in a turn?
New stalling speed = Old stalling speed x square root of load factor
How to calculate the load factor in a turn with a bank angle of 30?
load factor = n(1) / cos 30
during a glide, the distance flown compared to increased weight, remains?
Unchanged
A heavier aircraft will have a higher(vmd speed)?
maximum lift/drag ratio airspeed
In a glide, added weight will reduce?
The glide endurance
The ROC speed with altitude will -
increase
