Approaching Mach 1

• Tail of aircraft worked very nicely, shortening by 50% around Mach 1
• Moving at 700-780 m.p.h. at sea level

Wiktionary Word definitions in Wiktionary
a. 1 just below, or just above the speed of sound (0.8 < Ma < 1.2 approximately) 2 passing from subsonic to supersonic, or vice versa

Wikipedia Word definitions in Wikipedia
Transonic ( Laurie Tromette ) is a fictional comic book superhero appearing in books published by Marvel Comics . The character first appeared in Uncanny X-Men #526, in the first chapter of the "Five Lights" storyline, and was created by Matt Fraction and ...

WordNet Word definitions in WordNet
adj. (of speed) having or caused by speed approximately equal to that of sound in air at sea level; "a sonic boom" [syn: sonic ] [ant: subsonic , supersonic ]