Quote:
Originally Posted by Hacker15e
All right, can someone help translate this into the terminology that I've been taught as a military guy? I read one civilian FO's rant on military guys going through the schoolhouse at one of the Majors, where he said "and the military guy didn't even know how to do a V1 cut!"
He was right...that's not terminology that is used in the USAF, at least. Flying multiengine airplanes is the same, regardless of the terminology, so I'm sure that it's something I've practiced before, but I just didn't recognize the name.
So, here are the terms that we use in takeoff data:
Decision Speed: The MINIMUM speed at which I can lose an engine, then continue the takeoff in the remaining runway distance (called MIN GO speed in the F-15E).
Refusal Speed: The MAXIMUM speed at which I can lose an engine, then STOP in the remaining runway distance (called MAX ABORT speed in the F-15E).
Critical Engine Failure Speed: THE speed at which I can lose an engine, then either takeoff OR stop in the remaining runway distance.
The way I understand it, a "V1 Cut" is an engine failure that happens after max abort speed (in other words, a "go" mentality vs a high speed abort).
Thanks.
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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.