Thrust & Power Flashcards
What is thrust?
A force produced by the propeller
When will propeller thrust be a maximum?
At a low airspeed and then steadily decrease as airspeed increases
What is thrust required?
The amount of thrust required will depend on drag
At low airspeeds how much thrust is required?
At low airspeeds thrust required is high because drag is high
At high airspeeds how much thrust is required?
At high airspeeds thrust required is high because drag is high
What the minimum drag speed?
The minimum thrust required for level flight
What is the difference between thrust available and thrust required?
Excess thrust
What is excess thrust?
The difference between thrust available and thrust required
What occurs at the maximum excess thrust?
The (best) maximum climb angle
What is power?
The rate at which work is done, so is Thrust x Velocity
What is power output related to?
RPM
What happens to power available as speed increases?
It tends to increase
What is power required?
Drag x TAS
How much power is required at low airspeed?
As drag is high, power required will be high
How much power is required at high airspeed?
As drag is high, power required will be high
How much power is required at intermediate airspeed?
As drag will be lower, power required will be lower
What is excess power?
The difference between power available and power required
What is the difference between power required and power available?
Excess power
What occurs at maximum excess power?
The (best) maximum rate of climb
Where does minimum drag occur on the power required curve?
Corresponds to the highest ratio of TAS to power
What does the minimum drag point on the power curve provide?
The max range in nil wind
What is the region of reverse command?
The area of the power curve, where more power is required to maintain slower speeds
What does speed stable mean?
Changes in airspeed will be resisted
What does speed unstable mean?
Changes in airspeed will not be resisted and speed will runaway from the set speed
When does the best range occur?
Minimum thrust
When does best endurance occur?
Minimum power
