On Sep 10, 9:05*pm, Damon Hill wrote:
wrote in news:84db605b-4af4-4749-8238-eb9d5444ca94
@q9g2000vbd.googlegroups.com:

Yesterday I was reading about the Rocket Propulsion Establishment's
ideas for a lox/ammonia motor back in th early 50s. Does anyone know
if a lox/ammonia motor other than the XLR 99 was actually made
anywhere?

Not for spaceflight, it seems. *Hydrazine is the next step up from
ammonia (NH3, N2H4) and is a stable room temperature liquid with
very good performance.

--Damon

1953 was probably a little early for hydrazine - I think it doesn't
really start getting used until the late 50s.