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Using sub-cooled propane, at approximately -90°C (b.p. -42°C at STP) in combination with >80% hydrogen peroxide, can any meaningful gains be made, whilst considering that this fuel mixture would be used in an amateur engine design?

As well as this, what O/F ratio would be optimal for this fuel/oxidizer combination, and could these two liquids be stored at a common temperature, using additives to lower the HTP's melting point?

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    $\begingroup$ @uhoh yeah no I just mean in a tank that shares a common wall or something similar not actually mixing the two in one common tank- I can only see that ending badly $\endgroup$ – Reuben Farley-Hall Jan 22 at 12:50
  • $\begingroup$ Got it, I've made a small adjustment to the wording then, feel free to roll back or edit further. Interesting question btw! $\endgroup$ – uhoh Jan 22 at 15:34
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    $\begingroup$ As much as I want to answer these delightful questions about building your own rocket engines, it might not be appropiate for this site: space.meta.stackexchange.com/questions/1031/… $\endgroup$ – Anton Hengst Jan 22 at 18:55
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    $\begingroup$ @ReubenFarley-Hall I agree with Anton Hengst. $\endgroup$ – Puffin Jan 22 at 23:58
  • $\begingroup$ Amateur liquid fuel rockets of any kind are somewhat practicality challenged in the first place. $\endgroup$ – ikrase Jan 23 at 11:15