Bill,

"5 By." on the who's an adult.

Try this for recipies : http://www.pyrocreations.com/rocket_propellants1
Also, a very potent and somewhat dangerous variant: 60/40 to 75/25 mix of Flowers of Sulphur and fine groung powdered Alluminum (filings). Be REAL careful and only use very small volumes, this stuff makes bombs.

Also be advised, that here in the USA, when you use an ignited propellant to drive a projectile of any kind (including rocket housings or shells), out of a tube or barrel, You have 'manufactured a firearm' and must have a license or waiver from the BATFE. Just be sure you don't get too much exposure, or piss off your local constabulary.