[AR] Re: [UK OFFICIAL] Moon Express - HTP/kero
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Fri, 14 Jul 2017 17:38:13 -0400 (EDT)
I wrote:
I remember hydrazine thrusters had to be preheated.
Early ones did. It was the development of cold-start hydrazine catalysts
that caused people to largely abandon HTP...
I remember a discussion of one of the early Mariner midcourse-correction
propulsion systems, I think it was, that was a bit odd. It was basically
a hydrazine monoprop system, but it also had a tiny N2O4 tank! It dated
from just before the first cold-start catalysts; it ran briefly in biprop
mode to heat up its catalyst bed, and then transitioned to monoprop
operation for the main burn!
Henry
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