See report. Amateur advanced or Experimental and student rocketry groups develop sophisticated rockets that are reaching towards the threshold of space km or so depending on whom you ask! The vehicles include liquid and hybrid propulsion technology in addition to solid fuel motors. Besides trying to break high altitude records , these rockets are intended to provide low cost vehicles for research in such areas as microgravity. Though these advanced rocket projects demand enormous amounts of work and dedication, they are fun, exciting and educational for all involved. See History of Experimental Rocketry by Jeff Hove for reference information on current and past experimental rocketry groups and projects.
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HobbySpace - Rocketry
There is quite a number of propellants used in experimental rocketry and often people will get attached to one type or another and become quite knowledgeable about that propellant. The three most common types of propellants are compressed powder, usually black powder, sugar propellant most commonly sucrose, dextrose and most recently, sorbitol and composite propellant using ammonium nitrate or ammonium perchlorate as the oxidizer and a powdered metal usually aluminum or magnesium as the fuel. There are three well known people who are "experts" in each of these propellants: David Sleeter Teleflite Corporation has a book on black powder motors "Amateur Rocket Motor Construction. Richard Nakka is the sugar rocket specialist and has the most comprehensive experimental rocketry website bar none. In rocketry, the propellant is compressed or cast into large forms just smaller than the motor diameter.
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When the idea of an engine hacks theme was being kicked around at Hack a Day, the subject of rocket engines was one of the first to come up. First up is [Robert Watzlavick], who has been has been building liquid fueled engines for the last decade. As with many of the early rockets that launched man into space, [Robert] uses kerosene and liquid oxygen for fuel. This man knows his stuff. This engine is about as basic as you can get.