Cruise Performance Flashcards
1
Q
What are the requirements for maximum range? (6)
A
- Lowest weight
- Tailwind
- Low air temp (lower density altitude)
- Higher altitude (higher TAS)
- Clean configuration
- Maximum Specific Air Range
2
Q
What are the requirements for maximum endurance? (3)
A
- Minimum fuel flow
- Min Power to maintain altitude
- Altitude in Hand (reduce power and accept a small rate of descent)
3
Q
What are the requirements for minimum flight time?
A
- Fly at the highest TAS in nil wind, or highest GS in when wind is a factor
- Most direct route
*note, cannot be achieved at the most efficient airspeed
4
Q
What is SFC? How is it calculated?
A
Specific fuel consumption: ratio of fuel flow to TAS
SFC = FF/ TAS
5
Q
What is GFC?
A
Gross fuel consumption: the actual fuel flow in mass or volume per unit time
6
Q
What is SAR?
A
Specific Air range: the ratio of TAS to fuel flow (GFC)
SAR = 1/SFC or TAS/FF
7
Q
What is SGR?
A
Specific Ground Range: the ratio of Groundspeed to fuel flow
SGR = GS/FF
8
Q
How do you convert SAR to SGR?
A
TAS/GS = SAR/SGR
