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I searched on internet about rocket fuel and the most common fuel is $\ce{KNO3}$ + sugar (rocket candy), but I think that I could use another fuel methods, like using can with gas or using $\ce{HCl + Al}$.

My question is: Which one ($\ce{KNO3}$ + sugar, can with gas or $\ce{HCl + Al}$) gets more performance? Can I increase the performance by increasing the pressure and the durability?

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    $\begingroup$ Please take the necessary precautions when working with these substances and, when in doubt, please consult with someone that is an expert in this area. $\endgroup$
    – jonsca
    Nov 11 '13 at 7:55
  • $\begingroup$ When i refer to best is to the performance. $\endgroup$
    – RebeloX
    Nov 11 '13 at 18:32
  • $\begingroup$ Do you mean rocket fuel for home experiment? $\endgroup$
    – G M
    Nov 16 '13 at 16:25
  • $\begingroup$ What do you mean by performance? $\endgroup$
    – Greg
    Sep 27 '18 at 2:56
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I used Zn + S as a teenager. It is a lot safer than Al, and you can mix it cold.

Stick to solid propelants because it's simpler, safer and smaller. You don't want an explosion but something very quick burning.

Mix the two fine powders well.

You can mix them in a thick plastic bag or wide mouth bottle and shake until you see an even color in all the mix with no lumps in sight.

(You can make a paste with alcohol 100% but I never tried this.)

Then tap it in with wood or plastic. You don't want a spark! Nozzle reduction is 1/3 and not smaller. The mix is 3:1. Light with a filament, it is safer than a spark.

In those days all I had was a book but you can find a lot of info out there.

We switched to this after a (not too serious) accident with rocket candy.

Safety first allways, the rocket can go anywhere!

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  • $\begingroup$ Why do you say that? Could the Hydrogen released on the reaction HCL + AL be inflammable? $\endgroup$
    – RebeloX
    Nov 11 '13 at 21:25
  • $\begingroup$ I searched about that and Hydrogen is Highly inflammable. $\endgroup$
    – RebeloX
    Nov 11 '13 at 21:40
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    $\begingroup$ Stick to solid propelants because it's simpler, safer and smaller. You don't want an explosion but something very quick burning. $\endgroup$
    – f p
    Nov 12 '13 at 11:36
  • $\begingroup$ Yeah, to make a solid propelants with Zn + S you mix it cold and stick with a hammer? $\endgroup$
    – RebeloX
    Nov 12 '13 at 20:45
  • $\begingroup$ Mix the two fine powders well and tap it in with wood or plastic. You don't want a spark! Nozzle reduction is 1/3 and not smaller. The mix is 3:1. Light with a filament, it is safer than a spark. I'm remembering a lot... $\endgroup$
    – f p
    Nov 12 '13 at 21:00

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