THRUST

Set to 4 different clues across 4 published puzzles, most often “Rocket engineer's calculation” — The New York Times, Thursday, 30 November 2006.

6 letters

Every clue on record, most used first

Rocket engineer's calculationonce
The New York Times — Thursday, 30 November 2006
Rocket propulsiononce
The New York Times — Monday, 12 December 2005
Rocket engine forceonce
The New York Times — Monday, 16 September 1996
Liftoff rocket's forceonce
The New York Times — Monday, 23 October 1995