One of the mysteries of the English language finally explained.
A thruster on a spacecraft.
- ‘The vehicle is slightly unstable on the way up, but we have plenty of control authority from the vernier engines.’
- ‘Flight control was achieved by vernier engines located on the strapon boosters and the core sustainer.’
- ‘Small, single flap skirt armor connected directly to the upper legs, vernier engines stored inside being the only reason the armor had been placed there.’
1950s: named after P. Vernier (see vernier).
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