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Unmanned Spaceflight.com _ Chit Chat _ Who first came up with ullage motors?

Posted by: Jay Gallentine Oct 8 2006, 09:03 PM

Hello everyone,

In researching a social history of unmanned spaceflight, I am stuck on (yet another) conundrum: who, praytell, first came up with the concept of a ullage motor, to settle fuel in a weightless upper-stage?

Right now I have it that it's the Soviets, in working out the bugs on their Molniya launcher, but what do people think?

Thanks much,
Jay Gallentine

Posted by: Jim from NSF.com Oct 9 2006, 01:43 PM

Thor Agena had them for Discover