[SS-Propellant] Possible propellant casting concept

[Alberto Gassol]

Richard,

If it takes over 2 hours to cast one segment in 15 min cycles, the mold
should be heated to guarantee even bonding and propellant continuity.

Alberto
----- Original Message -----
From: "Rich Nakka" <richnakka at rogers.com>
To: "Propellant Development Team" <ss-propellant at exrocketry.net>; "Ken &
Lynne" <dynamics at uniserve.com>
Sent: Saturday, February 11, 2006 6:08 PM
Subject: [SS-Propellant] Possible propellant casting concept


> Greetings Team,
> I"ve given a lot of thought to possible improvements to the two methods
> under consideration (Tucker-Rider & Krech-Nakka), and I've put down my
> ideas on paper. Note, this sketch represents only a concept. It is
> beginning to appear (based on Serge's and Dustins enlightening
> experiments) that stirring of the slurry would be needed, period. I'll
> confirm (?)  this when I get my vacuum pump and continue the testing of
> the evaporation method.
>
> The method illustrated could be adapted to either liquid or powdered
> form of sorbitol & KNO3. If powdered form is used, a hopper would
> instead feed the materials into the mixing drum.
>
> Based on a 15 minute mixing cycle, a 3 kg batch size, and continual
> replenishment of the holding tanks, the twelve 34 kg. segments could be
> cast in 34/3 * 0.25 * 12 = 34 hours. If two units are used, the time
> could be cut in half. And it'd be a wise approach to use two units in
> case one breaks down irrepairably.
>
> Let's discuss this concept...have I overlooked any major issues? Is this
> concpet practical? Ideas for improvement? Simplification?
>
> Richard
>


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