Propulsive Efficiency of a LM A-4AR Fightinghawk Engine Calculator

The A-4AR Fightinghawk is an upgraded version of the A-4M Skyhawk, an attack aircraft originally designed by Douglas Aircraft Company. The A-4AR variant was upgraded by Lockheed Martin.

It’s important to note that specific details such as the heating value of the fuel and the mass flow rate would need to be obtained from engine performance data or technical specifications for the particular variant of the A-4AR Fightinghawk.

The propulsive efficiency is a crucial parameter in evaluating the performance of a rocket engine, indicating how well it converts propellant energy into useful thrust. Practical rocket engines often have propulsive efficiencies less than 100% due to factors like incomplete combustion, heat losses, and other inefficiencies in the propulsion system.

The propulsive efficiency () is defined by the following formula:

where,

  •  is the propulsive efficiency,
  •  is the thrust produced by the rocket engine,
  •  is the effective exhaust velocity of the rocket,
  • ṁ is the mass flow rate of the propellants,
  •  is the specific impulse of the rocket engine,
  • g0 is the acceleration due to gravity (approximately 9.81 m/s²).

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