When I was a kid in the early 70's I had a paperback book that was
called "A guide to amateur rocketry" that had plans for rockets that
used a "carmel candy" propellent based on sugar/Potassium Nitrate. You
would melt it in an oven and pour the mix into the rocket casing. The
rockets were about 4' long and describes as capable of reaching
15-20,000 ft. I think the book was written by an army captain. The
other fuel it described was a zinc/sulfur mix. I don't remember any
ISP numbers after all this time. I haven't seen the book in at least
20 years, saw it listed on bookfinder for $48

John Hartley
www.hotmoon.org

wrote:
I read that the Kassam rockets are fueled by a combination of sugar and
fertilizer.

Anyone know how good a fuel it is? ISP numbers?

How does it compare to other solid fuels?

Have amateur rocket builders used this fuel in the past?

Seems like a cheap way to make a solid rocket.