Easy to make solid rocket propellant from sugar and potassium nitrate. More commonly known as rocket candy.
As are most things that involve fire - Be Careful and do this outside with safety protection!
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Step 1: Materials
Granulated Sugar or Confectioners Sugar
Potassium Nitrate aka Saltpeter
A portable electric burner (your not going to do this inside right?)
An old pot or pan (yeah, your not going to want to eat of it afterward, plus if the stuff lights prematurely the pot will be toast.)
Something to put propellant into (the rocket maybe?)
Step 2: Mix Ingredients
Mix it at 60% potassium nitrate and 40% sugar by weight. Easy.
Step 3: Slowly Add Heat
Slowly add heat and continually stir. After a few minutes the sugar will begin to melt and get soupy.
Don't burn it!!!! This is why you do this outside. If it lights, the whole thing is going up in flames. Wear safety protection. Geez.
Once it gets soupy, as in the last photo, it is ready to pour.
Step 4: Pour Into the Mold
In this case I simply poured it into a glass container (which isn't a good idea as it turns out as you'll see in the final video.)
At this point you would pour the solution into whatever mold you'd like. Have it ready to go, the solution will harden quickly.
Add any wicks before it hardens.
I also made a small solid rocket motor which you'll see in the final video.