A probably stupid question: why expendable rockets do not reuse engines (probably by separating them from tank, parachuting/recovering/reusing them)? -- Denis Vlasenko
The cost of recovery often outweighs the savings throught re-use - NASA only save a couple of million by recycling Shuttle SRBs. --GW_SimulationsUser Page | Talk 22:11, 1 September 2006 (UTC)