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678 yards per minute is about one-tenth as fast as a Helicopter
In other words, it's 0.1310 times the speed of a Helicopter, and the speed of a Helicopter is 7.630 times that amount.
(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 5,180 yards per minute. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
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