| Answer | Crossword Clue |
|---|---|
| GLIDE | Soar without an engine |
| planing | (of a bird or an airborne object) Soar without moving the wings; glide |
| GLIDE | Aviate without an engine |
| GLIDE | Fly without an engine |
| IDLE | Keep an engine running without moving |
| starter | device that starts an internal-combustion engine without a need for cranking by hand |
| gliders | A light aircraft that is designed to fly for long periods without using an engine |
| rockets | An engine operating on the same principle, providing thrust as in a jet engine but without depending on the intake of air for combustion, an oxidizer being carried on board along with the fuel |
