Henry Spencer wrote:
> Since the plumbing systems for the two propellants necessarily meet in the
> chamber, there is inevitably a path back as far as the lowest oxidizer
> valve(s). The question is whether procedural measures like purges can
> keep that path from ever being followed. The way you debug such measures
> is by having them fail.
This is a motivation for using a propellant like propane,
which can be driven off as vapor at room temperature.
Commercial LPG has some higher molecular weight components,
though (butane at least).
Paul
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