Re: Power for Take-Off

Date:         11 Sep 97 03:35:31 
From: (ZineGreen)
Organization: AOL
References:   1
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Regarding the 757 losing its engine at takeoff:

It's true, the 757, and all other aircraft certified in the "transport
category"  (FAR 25/121), must be able to take off following an engine
failure at V1, or "takeoff decision speed."  This includes not just jets,
but many turboprops as well.

This "decision speed" can be several knots lower than the actual
"rotation" speed of the aircraft (the point where it begins to lift off).
Thus, the aircraft is capable of accelerating down the runway, lifting it's
nose in the air, and becoming airborne, all AFTER the loss of the engine.

The maximum allowable weight of the plane, which factors runway length,
obstacle clearance, temperature, etc., is calculated before each takeoff.
Under certain conditions, this weight can be substantially less than the
stat-sheet maximum gross weight of a given aircraft.   This is to allow for
the distance needed during an aborted takeoff, or for the continuing of the
takeoff as described above.