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How fast is 678 yards per minute?

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It's about one-tenth as fast as a Helicopter
In other words, 678 yards per minute is 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.
It's about one-tenth as fast as a Skydiver (headfirst)
In other words, 678 yards per minute is 0.140 times the speed of a Skydiver (headfirst), and the speed of a Skydiver (headfirst) is 7.10 times that amount.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 4,700 yards per minute. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
It's about one-fifth as fast as a Tornado
In other words, 678 yards per minute is 0.1871550 times the speed of a Tornado, and the speed of a Tornado is 5.3431650 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 3,226.6670 yards per minute and 4,018.6670 yards per minute. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
It's about one-fifth as fast as a Skydiver (belly-to-earth)
In other words, 678 yards per minute is 0.190 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 5.30 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 3,500 yards per minute. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.
It's about one-fourth as fast as a Fastball (baseball)
In other words, 678 yards per minute is 0.250 times the speed of a Fastball (baseball), and the speed of a Fastball (baseball) is 4 times that amount.
(a.k.a. rising fastball, a.k.a. cross-seam fastball, a.k.a. heater, a.k.a. hummer, a.k.a. smoker; for four-seam grip) (major league average)
The average speed of major league fastball pitch is 2,700 yards per minute. When up against the quickest professional fastball pitchers, a batter may have less than 0.4 seconds to react to a pitched ball.
It's about three-tenths as fast as a Curveball (baseball)
In other words, the speed of a Curveball (baseball) is 3.30 times 678 yards per minute.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 2,200 yards per minute. In the 1940's, debate over whether there really was a curve in the curveball pitch was settled with the conclusion that the ball does curve; however, an optical illusion caused by the spin of the ball and the batter's perception of motion exaggerates the extent of the curve.
It's about three-tenths as fast as a Hurricane
In other words, 678 yards per minute is 0.3120 times the speed of a Hurricane, and the speed of a Hurricane is 3.210 times that amount.
(formally: Topical cyclone; a.k.a. typhoon)
A hurricane is defined by the US National Hurricane Center as a Northern Hemisphere tropical storm having one-minute average wind-speeds of at least 2,170 yards per minute. Typhoons Tip (October, 1979) and Keith (October, 1997) and Hurricanes Camille (August, 1969) and Allen (August, 1980) jointly hold the record for highest tropical storm wind speeds at 5,650 yards per minute.