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Old 3rd Mar 2009, 05:33
  #921 (permalink)  
bobcat4
 
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Kinetic energy
mickrussom:

F=ma
It's more like kinetic energy; Ek = 1/2 * m * v * v

80 knots ~ 41 m/s. Engine mass: 2400 kg. Ek ~ 2 Megajoule

Of course, not all that energy can be translated to forward momentum. After all it takes some work to detach the engine.
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