[SS2S-Main] Re: Rocket help request
- From: "James Jason Wentworth" <blackshire@xxxxxxxxxx>
- To: <sugarshot@xxxxxxxxxxxxx>
- Date: Wed, 1 Jan 2014 16:43:26 -0900
Hello William,
Thank you for replying to my query. Actually, I'm looking to replicate the
paper-cased, single-use Rapier jet motors that Dr. Jan Zigmund ("Dr. Z") makes
in the Czech Republic; they are "drop-in" replacements for Jetex motors, but
they can no longer be imported into the U.S. now that the Czech government has
re-classified them as fireworks rather than as smoke generators. But there are
still many original Jetex motors (as well as the Japanese "Tiger" Jetex motors,
and the Jet-X motors of the 1990s) in use, and those modelers would welcome a
replacement propellant that would work in their motors. Also, new Jetex-type
motors (particularly the steel-cased HT ["High-Thrust"] ones) would not be
difficult for a machine shop or a metal-working shop to make. I will pass your
information along to the Jet-Ex-Press forum on Yahoo.com--thank you again!
-- Jason
----- Original Message -----
From: william colburn
To: sugarshot@xxxxxxxxxxxxx
Sent: Wednesday, January 01, 2014 8:22 AM
Subject: [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/ ).
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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