RAMJET
| Date | Clue |
|---|---|
| 2017-09-24 | Powerful engine |
| 2013-04-20 | Powerful engine |
| 2012-02-27 | Kind of engine for an airplane |
| 2007-12-08 | Engine using a stream of compressed air |
| 2000-06-01 | Engine for missiles |
| 2000-03-27 | Big airplane engine |
| 1999-12-01 | Aircraft engine |
| 1997-03-15 | Simple propulsion unit |
| 1994-10-11 | Airplane engine |