John Carmack wrote:
> We are considering mixed-monoprop + liquid catalyst for building huge > engines (20,000 lb thrust) where solid catalyst would cost fifteen thousand > dollars or so.
Changing from heterogenous to homogenous HP decomposition is not a small step.
Could you give an idea of the mixed monoprop composition intended? Are we still talking 50 % H2O2?
In which case you'd probably equally use glowplugs to ignite the alcohol in the approx. only 200�F decomposition products. Of which a large part initially 'll consist of oxygen and the rest of *wet* steam. Have you been able to ignite such so far?
JD
All of our engines and vehicles for the last year have been 50% peroxide + methanol mixed monoprop, running slightly lean of stoichemetric. We have done several hundred firings, with up to 120 second burns, 145 s measured Isp, and 3700 lbf motors. It does actually work. It is superior to 90% peroxide monoprop in every way (cost, availability, performance, handling) except for startup characteristics and motor size. We used glow plugs for a while, but spark plugs work better. Once the bottom catalyst pack is up to temperature, the extra ignition source is no longer required.
John Carmack
_______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
