[SS2S-Main] Re: SV: Re: Sugar Shot Weekly Activity Report - Dec.16-20, 2013
- From: flint hapirat <flinthapirat@xxxxxxxxx>
- To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
- Date: Wed, 1 Jan 2014 00:14:49 -0800 (PST)
Hi Jeppe
Sounds right.
Powder form is ay too volatile to ignite a grain.
You need to compress it. I used 5% NC laqour: 5gr pingpong balls in 100ml
acetone (water free acetone is a must!!!)
I mixed it with the powder to get a nice paste, poured the paste on parchment
paper and cut it into tiny little cubes (around 2mm-3mm OD).
These never let me down. If I see the ematch ignite - the motor roar is sure
to come... ;)
And yes... e-matches do tend to be problematic from time to time even if you
are sure they are perfectly set... ;)
Cheers,
Flint
http://www.pyrosystems.com/flint/
>________________________________
>From: Jeppe Locht <locht@xxxxxxxxxxxx>
>To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
>Sent: Tuesday, December 31, 2013 7:10 PM
>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.
>>
>>
>>
>>
>>
>>-----Original Message-----
>>From: william colburn <space1space@xxxxxxxxxxxxx>
>>To: sugarshot <sugarshot@xxxxxxxxxxxxx>
>>Cc: sliderulelover <sliderulelover@xxxxxxxxxxx>
>>Sent: Tue, Dec 24, 2013 10:34 pm
>>Subject: [SS2S-Main] Re: Sugar Shot Weekly Activity Report - Dec.16-20, 2013
>>
>>
>>The history of the development of nearly any new design is either replete
>>with failures or is somehow successful. The failures delineate and outline
>>the parameters
>>needed to address and their limits. In fact "Off-limits" testing is often
>>done to survey the boundaries of successful and non successful dimensions. A
>>success at the outset does not guarantee continued success.
>>
>>
>>Two years worth of development at China Lake for the first double-base rocket
>>motor. Hundreds of failures amongst a few successes.
>>
>>
>>In a rocket motor there are too many factors to consider and their multiple
>>interactions; as mentioned above, a success is just a lucky event in testing
>>a new design.
>>
>>
>>When at Thiokol, I heard many an explosion coming from the competitor rocket
>>company across the way. We had a few also despite having thermo, aero,
>>ballistic, grain design, mechanical, process, and propulsion engineers.
>>
>>
>>It is not an easy go and perserverance is a necessary trait in the propulsion
>>biz.
>>
>>
>>BC
>>
>>Gravity is a Stern Mistress..
>>The Tick.
>>
>>
>>
>>________________________________
>>From: Rick Maschek <rickmaschek@xxxxxxxxxxxxxx>
>>To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
>>Cc: "sliderulelover@xxxxxxxxxxx" <sliderulelover@xxxxxxxxxxx>
>>Sent: Tuesday, December 24, 2013 6:52 PM
>>Subject: [SS2S-Main] Re: Sugar Shot Weekly Activity Report - Dec.16-20, 2013
>>
>>
>>
>>Eric,
>>
>>I can appreciate your comment. I could easily have left the four failed
>>attempts out of the video and made it look like things went wonderful. I know
>>many that try not to show things that don't work.
>>
>
>[Hele den oprindelige besked er ikke inkluderet.]
>
>
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