[SS2S-Main] Re: SV: Re: Sugar Shot Weekly Activity Report - Dec.16-20, 2013
- From: Rick Maschek <rickmaschek@xxxxxxxxxxxxxx>
- To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
- Date: Tue, 31 Dec 2013 18:13:46 -0800 (PST)
We used CuO-Al thermite for the ProtoSShot and MiniSShot motors but discarded
its use for the DoubleSShot, instead using conventional igniters to ignite a
small propellant motor inside the core and using that flame to ignite the
surrounding motor. We used a similar system to ignite the 12 APCP motors I
helped make for the Myth Busters JATO 3 episode:
http://www.youtube.com/watch?v=cHUsGFGhfmk with all 12 of the motors used on
their two cars and a static test igniting successfully the first time.
On the TM-1 and TM-2 motor tests this year, we used Estes motors to light the
core: http://www.youtube.com/watch?v=ykLyrmrDKg8 successfully igniting those
motors the first time.
The Double D motor is different in not having a core. A new bulkhead has been
made, learning from the results of the last K-motor test, to facilitate grain
and igniter installation for this motor. A central igniter will be used to
ignite a disk of APCP attached to the top grain. Grooves will be cut to direct
the APCP flame front down the two uninhibited sides of the sugar grains and
igniting the motor.
Rick
Mark: I bought a couple of inexpensive digital stop watches, one for timing
when the on-board video camera is started a flight rockets, and one for
measuring time during high speed videos.
From: Jeppe Locht <locht@xxxxxxxxxxxx>
To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
Sent: Tuesday, December 31, 2013 9:10 AM
Subject: [SS2S-Main] SV: Re: Sugar Shot Weekly Activity Report - Dec.16-20, 2013
Our experience with CuO-Al is mixed. It lit well but burned too fast to ignite
the grain everywhere and it left a residue of pure copper in the throat. We are
experimenting with using CuO-Al to light gypsum thermite which can be cast and
burns slower. The jury is still out but the first results are promising.
Best regards
Jeppe Locht
/Danish Space Challenge
Fra: flint hapirat
Sendt: 31-12-2013 14:51
Til: sugarshot@xxxxxxxxxxxxx
Emne: [SS2S-Main] Re: Sugar Shot Weekly Activity Report - Dec.16-20, 2013
NICE work guys!!!!
Good burn data, no cato - that's a start!
Agreed on the thermite Mark!
I had SOGGY motors (humitidy/igintion/delay issues) that ignited instantly with
CuO-Mg thermit. It's easy to use - and I've made small grains of it using NC
laqour (water free acetone is required!) and I love it. BP+Ti grains also works
well but nothing beats CuO-Mg.
Incase you wonder - Fe2O3-Mg/Al are harder to ignite.
Cheers,
Flint
http://www.pyrosystems.com/flint/
From: "monsieurboo@xxxxxxx" <monsieurboo@xxxxxxx>
>To: sugarshot@xxxxxxxxxxxxx
>Sent: Wednesday, December 25, 2013 5:02 PM
>Subject: [SS2S-Main] Re: Sugar Shot Weekly Activity Report - Dec.16-20, 2013
>
>
>
>Nice burn! In the absence of a thrust curve, this looked and sounded like a
>neutral burn with roughly 7+ seconds at full thrust. The slo-mo of the
>pressure gauge confirms the chamber pressure stabilized quickly at a plateau.*
> The sliver sieve also seemed to work, and all its holes looked patent after
>the test fire. I did see, at 3:56-57, a gum-wrapper size piece of thin
>metal/thick foil fly through the frame. Any idea what that was?
>
>Looks to me like the new grain design is a winner. It makes me start to
>ponder how well it'd scale down!
>
>As for the ignition, well ... thermite??? ;-)
>
>Cheers,
>Mark L.
>DC
>
>
>* You might consider sticking one of those cheap quarter-size stick-on digital
>clocks on the test-stand girder within the slo-mo camera frame so the viewer
>could directly correlate time to pressure ... not that it would've made much
>difference with this burn.
>
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