A small simple rocket made of aluminium foil, a match, and 2 needles all in about 45 seconds if you are fast
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Step 1: Gather Materials
Matches (preferibly the paper ones, they have a larger head and weigh less, bud wooden ones kinda work too)
Step 2: Lay It Out
Take the match and place the needles along the match so that the tip of the needle is about at the middle of the match head Place the needels ontop of an approximately 1 x 1/2 inch sheet of aluminum foil
Like this(I know, bad pictures, sorry)
Step 3: Wrap It Up
Wrap it up very tight, and take care to make shure the needles dont move any, As all of the gas expands these will channel the gas out to propell the rocket, so this should be the only way the gas can get out, no gaps.
Then gentely remoove the pins, check to be shure they left openings against the stickfor the gas to leave.
Step 4: Launch It!
Just hold a lighter up to it and watch, on a good day these puppys can go about 10 feet.
DOND PICK IT UP, IT IS HOT! you wouldnt want to get a boo boo.
Now make a bizillion of them and shoot stuff.
Your first rocket probally work so well, EXPERIMENT!, change foil size, twist needles to give it a spin... make it work