Re: DC-X/Y tail-heavy?
- From: Pat Flannery <flanner@xxxxxxxxxx>
- Date: Mon, 06 Nov 2006 17:47:40 -0600
richard schumacher wrote:
Engine bells flush with bottom of heat shield; then, either
1. close heat shield doors over bells for re-entry
or 2. store ice behind heat shield. As it vaporizes upon re-entry, resulting steam exhausts through the engine bells.
1 should be lighter but requires motors etc. for the doors. 2 could be entirely passive but may weigh more.
Make a virtue of necessity and go with the plug-nozzle like used on ROMBUS/Pegasus:
http://www.abo.fi/~mlindroo/SpaceLVs/Slides/sld008.htm
http://www.abo.fi/~mlindroo/SpaceLVs/Slides/sld012.htm
The center of your plug-nozzle is your heatshield, and it can be actively cooled with left-over cryogenic propellants during reentry.
Pat
.
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