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Ramjet Propulsion |
 | | In a ramjet, the high pressure is produced by "ramming" external air into the combustor using the forward speed of the vehicle. |
| | The combustion that produces thrust in the ramjet occurs at a subsonic speed in the combustor. |
| | Because the ramjet uses external air for combustion, it is a more efficient propulsion system for flight within the atmosphere than a rocket, which must carry all of its oxygen. |
| www.grc.nasa.gov /WWW/K-12/airplane/ramjet.html (547 words) |
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