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How fast is 17,000 furlongs per fortnight?

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It's about one-thirtieth as fast as a Helicopter
In other words, 17,000 furlongs per fortnight is 0.0358 times the speed of a Helicopter, and the speed of a Helicopter is 27.90 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 474,000 furlongs per fortnight. 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-twenty-fifth as fast as a Skydiver (headfirst)
In other words, the speed of a Skydiver (headfirst) is 26 times 17,000 furlongs per fortnight.
(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 430,000 furlongs per fortnight. 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-twentieth as fast as a Tornado
In other words, 17,000 furlongs per fortnight is 0.05120976 times the speed of a Tornado, and the speed of a Tornado is 19.527530 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 295,680 furlongs per fortnight and 368,256 furlongs per fortnight. 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-twentieth as fast as a Skydiver (belly-to-earth)
In other words, the speed of a Skydiver (belly-to-earth) is 19 times 17,000 furlongs per fortnight.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 320,000 furlongs per fortnight. 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-fifteenth as fast as a Fastball (baseball)
In other words, the speed of a Fastball (baseball) is 14 times 17,000 furlongs per fortnight.
(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 250,000 furlongs per fortnight. 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 one-tenth as fast as a Curveball (baseball)
In other words, the speed of a Curveball (baseball) is 12 times 17,000 furlongs per fortnight.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 200,000 furlongs per fortnight. 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 one-tenth as fast as a Hurricane
In other words, 17,000 furlongs per fortnight is 0.0854 times the speed of a Hurricane, and the speed of a Hurricane is 11.70 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 199,000 furlongs per fortnight. 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 518,000 furlongs per fortnight.