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Maximum Rate Shuttle Launches
On Jun 12, 4:57 pm, Len wrote:
On Jun 12, 1:21 pm, Oren T wrote: On Jun 12, 12:58 pm, "Ed Ruf (REPLY to E-MAIL IN SIG!)" wrote: On Mon, 11 Jun 2007 12:03:33 -0700, in sci.space.policy Len wrote: technology. As I understand it, even a complicated beast like the SR-71--with hydraulic "fluid" that was solid at room temperature--was flown twice in the same day. IIRC, they only did it once, because of cost considerations--not techinical difficulties. I thought the SR-71 used its JP-7 fuel for hydraulic fluid? JP-7 isn't anywhere near a solid even at winter temps in Hampton, VA where we have several drums of if out back behind our facilities. -- Ed Ruf ) A quick web search shows it had two hydraulic systems: one for the engines which used the fuel as working fluid and another using something solid at room temperature. Len suggests it may have been NaK but a eutectic is liquid at STP (mp -12.6 C). Perhaps it was straight sodium? NaK would be solid on a cool day, but otherwise liquid and more practical. Solid sounds more interesting--and perhaps worth stretching a point when people want to talk about an unusual plane? :-) Len I should have added that Kelly Johnson was not averse to turning a clever phrase such as: "We get all of our thrust out of the inlet; the engine is just a flow inducer." If you keep your books the right way, this is actually true. The forces on the B-70 engine mounts actually reversed at mach 3. Len Oren |
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