Nickel is a good and often used as a 2nd choice because of its strength,
corrosion resistance and good conductivity.
K
On Thu, Oct 22, 2020 at 11:26 PM Peter Fairbrother <peter@xxxxxxxxxx> wrote:
On 22/10/2020 17:58, Henry Spencer wrote:
And speaking of outside for fifty years :-), see the second [Black Arrowphoto] attached for
what the first stage of the only orbital launch looks like now -- it was
at the Royal International Air Tattoo airshow last year.
From the photo it looks like the engine is copper, but aiui Black Arrow
used peroxide regen cooling - earlier (below) you said that use of
peroxide as coolant meant that you can't use copper for the chamber. Are
the copper bits the extensions you mentioned?
Do you know what the chambers were made of?
Thx,
Peter Fairbrother
On 15/10/2020 03:39, Henry Spencer wrote:
> 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
>