Fastest speed attained by a propeller aircraft

Fastest speed attained by a propeller aircraft (870 km/h)

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Fastest speed attained by a propeller aircraft (870 km/h)

is 1/400 of Speed of a bolt of lightning (350,000 km/h)...more
is 1/4 of Fastest speed attained by a jet aircraft (3,530 km/h)...more
is 2/5 of Speed of Concorde passenger SST (2,140 km/h)...more
is about as big as Speed of a commercial airliner (880 km/h)...more
is 2.5 x Speed of China's Shijiazhuang?Wuhan high-speed train (350 km/h)...more
is 10 x Top speed of a horse (88 km/h)...more
is 20 x Fastest speed attained by a human-powered aircraft (44.3 km/h)...more
is 25 x Top speed of a Brown Bear (35 km/h)...more
is 25 x Top speed of a Bottlenose Dolphin (35 km/h)...more
is 25 x Fastest speed attained by a human-powered watercraft (34.3 km/h)...more
is 40 x Top speed of a California Sea Lion swimming (21.6 km/h)...more

If this was a standard unit ...