[SS-Propellant] Possible propellant casting concept

[Rich Nakka]

Alberto Gassol wrote:

>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
>  
>
Excellent suggestion, Alberto. Two possible approaches. One, active 
heating of the mould, or two, pre-heat and insulate the mould to retain 
heat.

Richard


>----- 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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