Range And Endurance Flashcards
(15 cards)
1
Q
Specific air range (SAR)
A
- Measure of the efficiency of an aircraft in terms of how far it can fly per unit of fuel consumed
- Higher SAR value indicates greater efficiency
2
Q
Specific air range =
A
TAS x 1/GFC = TAS/GFC
Where GFC = Gross Fue Consumption, or the fuel used in a given amount of time, expressed in L/hr or G/hr
3
Q
Specific fuel consumption
A
- Equal to the gross fuel consumption per unit of power produced by the engine.
SFC = GFC/Power
GFC = SFC x Power
4
Q
On the drag curve, where is TAS for best range?
A
- The curve’s lowest point
5
Q
Effect of altitude on range
A
- Flying at the IAS providing the minimum amount of drag. IAS doesn’t change with altitude which means that the TAS for best range must increase with altitude.
6
Q
Effect of weight on range
A
- Higher weight = more requirement for lift = increased AoA = increased drag
Range is reduced with an increase in weight
7
Q
Effect of wind on range
A
- Headwind = decreased range
- Tailwind = increased range
8
Q
RPM/MAP on range
A
- RPM should be set to the lowest speed within operational limits
- MAP should be adjusted t its maximum level for the given RPM
9
Q
Effect of mixture on best range
A
Should be leaned for best economy mixture
10
Q
Effect of temperature on range
A
- Cold temperatures increase density which allows more air and fuel molecules to enter the cylinders on each induction stroke.
- Morse power can be achieved at a lower RPM, increasing engine efficiency
11
Q
Effect of altitude on best range
A
- Full throttle height
12
Q
Flying for endurance
A
- Maximising the time an aircraft can stay airborne on a given amount of fuel
13
Q
Effect of altitude on endurance
A
- Power = drag x TAS
- Aircraft must be flown at the lowest safe altitude
14
Q
Effect of weight on endurance
A
- Increase in weight leads to a reduction in endurance.
15
Q
Effect of engine on best endurance
A
- RPM should be as low as practicable
- MAP set for minimum power speed
