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  Space Shuttles - Space Station
  Space Shuttle Main Engines: RS-25 vs RS-68

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Author Topic:   Space Shuttle Main Engines: RS-25 vs RS-68
OV3Discovery
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Posts: 100
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Registered: Mar 2015

posted 10-12-2015 07:57 AM     Click Here to See the Profile for OV3Discovery     Edit/Delete Message   Reply w/Quote
Would there have been any improvements in performance, cost or reliability if the space shuttle used RS-68 engines, if they had existed back in the 1980s?

Jim Behling
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Posts: 1463
From: Cape Canaveral, FL
Registered: Mar 2010

posted 10-12-2015 11:42 AM     Click Here to See the Profile for Jim Behling   Click Here to Email Jim Behling     Edit/Delete Message   Reply w/Quote
No. The shuttle could have not made it to orbit using the RS-68. The ISP is too low. There is a saying used on other forums that is applicable here. Rockets are not Legos. Components are not easily interchanged.

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