Topic Author
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Joined: Sat Sep 25, 1999 12:01 pm

Terminology Question

Tue Sep 12, 2000 7:34 am

In aviation, there is a term that refers to the "point of no return" on a takeoff. In other words, given speed and runway length, there is a point at which it is too late to abort a takeoff. What is this called? Thanks for your help.
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RE: Terminology Question

Tue Sep 12, 2000 7:41 am

Anytime after V1. Or the "decision speed" This depends on the aircraft.
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RE: Terminology Question

Tue Sep 12, 2000 8:31 am

If the runway is long enough, like at Edwards, almost any t.o. is abortable.

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RE: Terminology Question

Thu Sep 14, 2000 8:59 am

N312RC has it. For transport certified aircraft V1 is the speed on the runway that allows for the pilots to react to a situation and bring the aircraft to a halt on the remaining runway. The speed is greater than the minimum control speed on the ground to allow for critical engine failure etc.
Two accidents regarding V1 are worth a mention. A good example of why not to abort a takeoff beyond V1 was demonstrated by a DC-10-30 at Nagoya a few years back. The other is the Concorde at CDG earlier this year, by sticking to the 'continue' restriction of an airspeed above V1 the aircraft became airborne with a burning wing.
The DC-10 would have completed a circuit and landed, the Concorde would not have stopped on the runway, but MAY have been survivable. The Concorde Captain did EXACTLY as he was trained, however.
Hope this helps.  
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RE: Terminology Question

Thu Sep 14, 2000 11:29 am

I believe V1 is the speed at which the aircraft can be stopped completely on the remaining runway without the use of reverse thrust. It all depends on TO weight, runway condition, length, air pressure, humidity etc.