On Tue, 8 Jun 2004, Pierce Nichols wrote:
> > The big DISadvantage to gimballing is the technology required to make
> > it work reliably.
>
> You are thinking of two-axis gimballing with cryogenic propellants,
> which is hard. One axis gimballing with room temperature propellants
> uses the same technology as jet vanes, minus the high temperature bits.
Plus bearings with high thrust loads, plus high-cycle-life flexible or
rotating connections for propellants (particularly problematic for
pressure-feds), plus rather heavier high-speed actuators, plus control
complications from the fact that the engines become quite significant
moving masses.
Henry Spencer
[EMAIL PROTECTED]
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