Specific fuel consumption is typically defined as the amount of fuel required to generate unit thrust over a period of time. What does it measure?

Specific fuel consumption is typically defined as the amount of fuel required to generate unit thrust over a period of time. What does it measure?

• A. The amount of fuel onboard for a mission.
• B. The duration an engine can run on full power.
• C. The quantity of fuel required to generate unit thrust over a period of time.
• D. The volume of fuel that leaks during operation.

Answer: (C)

Specific fuel consumption measures propulsion efficiency by relating fuel use to thrust produced over time. It answers how much fuel is needed to generate a given amount of thrust for a certain period—essentially fuel flow per unit of thrust. A lower SFC means the engine produces the same thrust with less fuel, signaling better efficiency. It isn’t about how much fuel is onboard, how long the engine can run at full power in isolation, or about fuel leaks. The description that matches is the quantity of fuel required to generate unit thrust over a period of time.

Specific fuel consumption measures propulsion efficiency by relating fuel use to thrust produced over time. It answers how much fuel is needed to generate a given amount of thrust for a certain period—essentially fuel flow per unit of thrust. A lower SFC means the engine produces the same thrust with less fuel, signaling better efficiency. It isn’t about how much fuel is onboard, how long the engine can run at full power in isolation, or about fuel leaks. The description that matches is the quantity of fuel required to generate unit thrust over a period of time.