KNO3 Sugar rocket propellant and safety

[ebanfa]

Hi,
I am new to building large candy rockets, and I have a target of building a candy rocket that can reach an altitude of over 40,000ft. I am mostly concerned with the safety when casting such propellants. I am looking at casting over 200 pounds of propellant. Any one got any advice. I have read a lot on candy rockets (e.g. www.nakka-rocketry.net) and built some small rockets and I want go for the big one but experience makes the difference and experience in building such rockets I don't have.
I would appreciate any suggestion/advice. I love rocketry but I also love my body parts too.

Thanks

 

[anorlunda]

If you haven't done so already, join a model rocketry club. Most clubs are very safety conscious. Face-to-face mentoring and supervision is much superior to asking strangers on the Internet.