Re: Multiple engines (was RE: Liquox)

At 05:44 PM 6/10/2004 -0700, you wrote:
>On Thu, 2004-06-10 at 17:13, George William Herbert wrote:
>
> > I looked a lot at making a lot of little nozzles out
> > of a single plate either cast or machined with
> > micronozzles across the plate.  Cast inconel plates
> > with the nozzles preformed aren't that expensive,
> > and can operate at the required temps for many
> > of the propellants.  Probably including your
> > mixed monoprop.  Stainless is probably even
> > good enough for that mixture.
>
>         Sounds really easy to fabricate, even with cooling passages... 
> how bad
>is the hit to performance?
>
>         -p

Doing it with cooling passeges sounds pretty challenging to me, but we are 
planning on fabricating a palte with 16 x 1" nozzles, which should be a 
direct performance comparison with our current 1 x 4" nozzles, if I keep 
the same expansion ratios.  I don't expect it to have a significant 
performance loss, and we might even get some aeruospike expansion effect at 
high altitudes if we arrange the nozzles correctly.

John Carmack