Re: Ullage

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In a message dated 7/26/99 7:01:25 PM Eastern Daylight Time, rjohn@Riem.Com 
writes:

> 	I noticed in the Globalstar web pages, reference to
>  an 'ullage' event over Australia.  A trip to the dictionary
>  didn't satisfy me so I am appealing to the list.

The satellite has entered microgravity and the liquid fuel is free-floating 
in its container. Firing the motors with gasseous fuel would cause unwanted 
cavitation. An 'ullage'(which has another name related to brewing, but I 
can't recall... rhuer?) event employs an alternative propulsion (such as 
compressed gas or solid rocket etc.) to thrust the satellite forward, 
momentarily forcing the liquid fuel back to where it can be drawn into the 
pumps supplying the motor and ignited.

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