[SS2S-Main] Re: Rocket help request

  • From: william colburn <space1space@xxxxxxxxxxxxx>
  • To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
  • Date: Wed, 1 Jan 2014 09:22:29 -0800 (PST)

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/ ).  
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 
).  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://www.youtube.com/watch?v=sk3RV0lLygk , and 
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

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