It's about as fast as Secretariat.
In other words, the speed of Secretariat is 1 times 0.0506 mach.(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 0.0506 mach in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about four-fifths as fast as a Greyhound.
In other words, 0.0506 mach is 0.8350 times the speed of a Greyhound, and the speed of a Greyhound is 1.20 times that amount.(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.0607 mach. 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 four-fifths as fast as a Gazelle.
In other words, the speed of a Gazelle is 1 times 0.0506 mach.(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 0.07 mach. 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 four-fifths as fast as a Hare.
In other words, the speed of a Hare is 1 times 0.0506 mach.(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 0.06 mach. 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-three-fifths times as fast as Michael Johnson.
In other words, 0.0506 mach is 1.6210 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.61690 times that amount.(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 0.03123 mach at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.
It's about one-and-three-fifths times as fast as Usain Bolt.
In other words, 0.0506 mach is 1.630 times the speed of Usain Bolt, and the speed of Usain Bolt is 0.6130 times that amount.(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 0.0312 mach at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.
It's about three-fifths as fast as a Knuckleball (baseball).
In other words, 0.0506 mach is 0.560 times the speed of a Knuckleball (baseball), and the speed of a Knuckleball (baseball) is 1.80 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 0.092 mach. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.