Hi, I know Dr. Zikmund personally. I will forward this e-mail to him if there is any help :-) Roman ---------- Původní zpráva ---------- Od: william colburn <space1space@xxxxxxxxxxxxx> Datum: 1. 1. 2014 Předmět: [SS2S-Main] Re: Rocket help request " Beware of the site on ebay that offered a formula for loading Jetex Engines. They gave the Micrograin formula which would not only melt the aluminum motor casing but probably would first disassemble it instantaneously. Terry McElheran developed a castable formulation for Jetex. I have his complete set of lab notebooks. I will search them for the right formulation. IIRC his formulation used AN which is a. not so available now and b. In AZ worked fine but in higher humidities would show its hygroscopic nature. There are workarounds however for that one fault. More later. Gravity is a Stern Mistress.. The Tick. From: James Jason Wentworth <blackshire@xxxxxxxxxx> To: sugarshot@xxxxxxxxxxxxx Sent: Wednesday, January 1, 2014 12:57 AM Subject: [SS2S-Main] Rocket help request Hello All, Yesterday and today I have received numerous messages on the SS2S e-mail list. I was wondering if anyone here could offer suggestions to solve a problem: I am a Jetex and Rapier model jets enthusiast (see: http://www.jetex.org/ (http://www.jetex.org/) ). While Jetex motors and fuel haven't been made since 1972, Dr. Jan Zigmund ("Dr. Z") in the Czech Republic has developed the Rapier motors, which are single-use replacements for the Jetex motors (see: www.jetex.org/motors/motors-rapier.html (http://www.jetex.org/motors/motors-rapier.html) ). Unfortunately, they can now no longer be imported into the USA because the Czech government has re- classified them as fireworks instead of as smoke generators. Also: Recalling David Sleeter's "Incredible Five Cent Sugar Rocket" which could be made safely--and in quantity--at a kitchen table using ordinary household materials (see: http://blizzard.rwic.und.edu/~nordlie/rocket/nickle.html (http://blizzard.rwic.und.edu/~nordlie/rocket/nickle.html) , http://www. youtube.com/watch?v=sk3RV0lLygk(http://www.youtube.com/watch?v=sk3RV0lLygk) , and http://nineball.ve.carpathiahost.net/zero/Articles/Sugar_Rockets.html (http://nineball.ve.carpathiahost.net/zero/Articles/Sugar_Rockets.html) ), something similar to this but optimized for model jet use (an end-burner producing 1/10 of a newton or so of thrust, for 10 - 20 seconds or more) would enable Jetex and Rapier flyers in the western hemisphere to enjoy our hobby with no worries about being unable to obtain jet motors for our models. Could anyone here suggest propellant formulas for such low-thrust, long-burning jet motors? (The Rapier motors link above includes performance figures for the various Rapier motors.) Many thanks in advance to anyone who can help! Sincerely Yours, James Jason Wentworth "