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Old 18th September 2007 | 12:53
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Mad (Flt) Scientist
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From: La Belle Province
Depends on the aircraft of course, but a 50 tonne aircraft (50,000kg;110,000lb) with a V1 of 100knots (51.4 m/s) would have a kinetic energy at V1 of:

0.5 * 50,0000 * 51.4 * 51.4 = 66.049 MJ which is certainly in the range you want.

Things to look out for are:
the speed is true ground speed, not airspeed, so you need to correct for wind and altitude effects
Vmbe may assume some energy goes into drag or TR use (depending on whether the energy quoted is the BRAKE capacity or the aircraft energy at which the brakes hit the limit)
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