Range

Question 1

Range is defined as

Answer 1

Distance covered on the available fuel

Question 2

Specific range is the ratio between

Answer 2

True air speed and rate of fuel consumption

Question 3

SAR

Answer 3

Specific Air Range:

TAS/Fuel Flow

Or

         TAS —————————- SFC X (Thrust Required)

Question 4

SGR

Answer 4

GS/Fuel flOW

Question 5

Fuel Flow vs thrust

Answer 5

Higher thrust = more fuel flow (Jet)
Higher power = more fuel flow (Propeller)

Question 6

Specific Fuel Consumption in a jet and propeller aircraft

Answer 6

Fuel flow per unit of thrust in a jet
Fuel flow per unit of power in a propeller aircraft

Question 7

SFC is lowest when

Answer 7

Air temperature is low engine running as design RPM 90-95%

Question 8

Best range cruise speed for a jet is

Answer 8

1.32VMD

Question 9

Best range cruise speed for a propeller aircraft is

Answer 9

VMD

Question 10

Optimum altitude

Answer 10

Best range
2000ft deviation = 1% change in consumption
8,000ft deviation = 10% change in consumption

Question 11

Wind Vs Range

Answer 11

Does not affect SAR

SGR
Tailwind - Slightly slower than 1.32MD
Headwind - Slightly faster than 1.32MD - flying faster to compensate for wind

Question 12

Long range cruise speed

Answer 12

Flying faster than 1.32MD MMR speed to complete more flights
MLRC = Long range cruise speed

SR long range = 0.99 x SR max range
4% faster than MMR

Question 13

SFC Consumption Formula

Answer 13

Fuel Flow/Thrust