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How fast is 39.10 knots?

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It's about as fast as a Gazelle
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 40 knots. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
It's about as fast as a Greyhound
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 39.10 knots. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about as fast as a Hare
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 40 knots. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about one-and-one-fifth times as fast as Secretariat
In other words, 39.10 knots is 1.2 times the speed of Secretariat, and the speed of Secretariat is 0.833 times that amount.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 32.60 knots in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about two-thirds as fast as a Knuckleball (baseball)
In other words, 39.10 knots is 0.67 times the speed of a Knuckleball (baseball), and the speed of a Knuckleball (baseball) is 1.5 times that amount.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 59 knots. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about two-thirds as fast as a Cheetah
In other words, 39.10 knots is 0.6554 times the speed of a Cheetah, and the speed of a Cheetah is 1.526 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 59.670 knots in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about three-fifths as fast as a Hurricane
In other words, 39.10 knots is 0.608 times the speed of a Hurricane, and the speed of a Hurricane is 1.64 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 64.30 knots. 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 167 knots.