Quote:
Originally Posted by EDC757
Mostly correct. But Decision Speed is a calculation that guarantees that you can stop the aircraft on the remaining runway or takeoff and reach 35 feet at the end of the runway, climb to 1500 feet and return for a landing. If the runway is short then the aircraft may be weight limited to be able to perform as such.
Critical Engine Failure Speed is the speed that you must fly if you lose the most critical engine on takeoff. Lower than this speed on a multi engine aircraft the aircraft will roll over.
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Refusal and V1 are the same. In the navy we called "refusal" and that is when the flying pilot took his hands off the power levers. Here in the Civie world, we call V1 and the Captain removes his hands.
Decision Speed will be equal to or less than Refusal Speed. If it is more, than you are overweight for takeoff.