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Highlights of recent developments on the MiniSShot Project
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- The propellant grain "structural" test (
http://www.sugarshot.org/downloads/ms_grain_structural_test.pdf
) will be performed this week. Rick Maschek has already prepared the
test specimen. The next step will be to run the test, pressurizing the
specimen to a pressure of up to 1000 psi (68 atm.).
Propellant cast into ablative tubes:
http://www.sugarshot.org/downloads/dsc07951a.jpg
Tubes are then bonded together:
http://www.sugarshot.org/downloads/dsc07956a.jpg
http://www.sugarshot.org/downloads/dsc07958a.jpg
Bonded assembly installed in section of Ameron fibreglass tube:
http://www.sugarshot.org/downloads/dsc07991a.jpg
- Richard has completed rough-casting all 12 of the ablative tubes
needed for the MiniSShot-2 motor. The parts are now being machined down
to blueprint dimensions, which removes close to half of the original
material:
The twelve tubes. The six in front are for the forward motor chamber,
six in back for the aft chamber:
http://www.sugarshot.org/downloads/castingtubes014a.jpg
Machining (boring) the interiors:
http://www.sugarshot.org/downloads/castingtubes001a.jpg
- Richard has completed a draft version of the MiniSShot Launch Report.
The document has been distributed to team members and collaborators for
comments. Once the feedback has been received, the comments will be
incorporated and the document finalized. The report will then be posted
on the Sugar Shot website documentation page.
- Hans reports that he has succeeded in coming up with a strategy to
speed up the Chute Controller (CC) adaption rate, and that it will soon
be implemented and tested. The purpose of this software update is to
better cater to anomalies in flight trajectory, to help ensure the CC
has the intelligence to deploy the main parachute at an opportune time.
Highlights of other recent developments
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- Rick Maschek has cast a "star unigrain". It features a 7-pointed star
core, and consists of two grain segments cast as a single grain. The
7-pointed star is an attractive configuration, as it provides for a
nearly-neutral Kn. Additionally, the grain burns solely in the core,
providing inherent thermal protection of the motor casing for most of
the burn duration.
Fin mandrel assembly consisting of 7 fins and a central heptagonal rod:
http://www.sugarshot.org/downloads/dsc07964a.jpg
Mandrel base cast from epoxy, which serves to hold the fins in position:
http://www.sugarshot.org/downloads/dsc07965a.jpg
http://www.sugarshot.org/downloads/dsc07966a.jpg
http://www.sugarshot.org/downloads/dsc07968a.jpg
Mandrel installed in casting tube:
http://www.sugarshot.org/downloads/dsc07990a.jpg
Propellant cast in place. Unigrain made up of two segments:
http://www.sugarshot.org/downloads/dsc08001a.jpg
Propellant cast in place. Shown with heptagonal rod extracted:
http://www.sugarshot.org/downloads/dsc07969a.jpg
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