[AR] Re: RP-1 versus ethanol for a student rocket?
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Wed, 14 Oct 2020 22:39:24 -0400 (EDT)
On Wed, 14 Oct 2020, ken mason wrote:
Trick question. What the Brits reach temperature wise with H2O2
in their regenerative cooled designs?
Was the fuel or oxidizer the coolant? O/F vol ~4/1.
Mostly oxidizer-cooled. Peroxide has a much higher specific heat than
kerosene, and it's dense, and you need a lot of it for optimal mixture
ratio, so overall it makes a great coolant. (Does mean that you can't use
copper for the chamber, though.)
The nozzle extensions on the Black Arrow second-stage engines were
fuel-cooled, so they could be left off -- to test the full second-stage
engine assembly in sea-level air -- without altering the chamber cooling.
Henry
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