/sci/ - Science & Math

>>12766897
>Propane at room temperature is a non-starter for pump fed engines, as
its vapor pressure is too high for light weight tanks. Propane is
unusual in that it will not freeze solid if put in tanks in thermal contact with LOX tanks; it has been proposed therefore to use sub-cooled
propane. Calculations done here show both propane at its normal boiling
point, and at 100 K, about 10 K above LOX temperature. Sub-cooled
propane (at LOX temperatures or slightly above to account for imperfect
chilling of propane by adjacent LOX tanks) is a winner, with a bulk density nearly the same as that of RP-1, and a superior Isp.

>>12148528