[SS2S-Main] Re: Sugar Shot Weekly Activity Report - Dec.16-20, 2013

  • From: "Jeppe Locht, Mainstage Co. " <locht@xxxxxxxxxxxx>
  • To: sugarshot@xxxxxxxxxxxxx
  • Date: Wed, 25 Dec 2013 10:37:18 +0100

And the prize for showing remarkable restraint despite fair reason to go
ballistic, goes to Rick ;-)


On Dec 25, 2013 03:52 "Rick Maschek" <rickmaschek@xxxxxxxxxxxxxx> wrote:

> 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.
> 
> 
> 
> This was the first time we did this type of motor. The tops of the
> grains were inhibited with polyester resin and a layer of pyrogen was
> painted across the top and down the two sides of the grain. During
> motor assembly, the floating nozzle slid forward and cracked the
> igniter's bridge wire, this was discovered after the first attempt and
> inspection of the igniter. On the second attempt with a new igniter,
> continuity was lost. On the third attempt, the igniter was not of
> sufficient intensity to ignite the pyrogen painted on the top surface.
> On the fourth attempt, a larger igniter was used and managed to burn
> the pyrogen painted on the top inbitited surface (seen in the 4th
> picture of the video) but failed to continue to burn down the sides of
> the grain. On the fifth attempt, a 0.125 thick slice of APCP
> propellant was cut from a 38mm grain and the igniter place in its
> center. That ignited the motor. This small K-class motor was to test
> this very thing, how to ignite these grains, would the sliver catcher
> work, and would this grain geometry burn as predicted. We were
> successful with these three things. A new bulkhead and igniter design
> has already been machined that should solve this problem.
> 
> 
> 
> If you look at our many previous videos of motor tests, you will see
> we have nearly 100% ignition on the first attempt. Thank you for your
> comments.
> 
> 
> 
> 
> 
> Rick
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> From: Eric Christy <sliderulelover@xxxxxxxxxxx>
> To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
> Sent: Tuesday, December 24, 2013 6:02 PM
> Subject: [SS2S-Main] Re: Sugar Shot Weekly Activity Report -
> Dec.16-20, 2013
> 
> 
> 
> 
> You guys are EMBARASSING! Either you're lousy chemists, not able to
> get your mixture correct, or you're lousy electronics engineers, not
> able to make decent continuity between control board and igniter, or
> you're both. Which is it??? Suffice it to say, you bozos are very
> UNimpressive! When you grow some decent science, then get back to me.
> I bet you can't even balance the chemical reaction between Potassium
> Nitrate and Sorbital (sugar). You need to get that part right first
> before you try connecting to the igniter.
> 
> 
> 
> Eric
> 
> 
> 
> 
> 
> 
> 
> > Date: Mon, 23 Dec 2013 22:25:28 -0600
> > Subject: [SS2S-Main] Sugar Shot Weekly Activity Report - Dec.16-20,
> > 2013
> > From: richard.rocketry@xxxxxxxxx
> > To: sugarshot@xxxxxxxxxxxxx
> >
> > Highlights of recent developments on the DoubleSShot project
> > --------------------------------------------------------------------
> > -------------------
> > -As planned, Rick Maschek test fired the 89mm (3.5”) 2-grain rocket
> > motor with DD-slot grains on Saturday Dec.21st. The test firing was
> > conducted at the FAR site, with the motor mounted nozzle down on one
> > of the vertical test stands. The base of the stand was fitted with a
> > blast deflector to help prevent smoke from obscuring the pressure
> > gauge used to record chamber pressure. This worked well, and good
> > pressure readings were recorded over the full duration of the burn,
> > which was nominal. Maximum chamber pressure was about 260 psi
> > (1.9Mpa), which compares well with the predicted pressure of 248
> > psi.
> > Due to problems with the igniter, the planned firings of the 4-grain
> > and 6-grain motor had to be postponed. Rick will be modifying the
> > forward bulkhead with an igniter fitting to prevent a similar
> > igniter
> > issue from re-occurring.
> > Rick and Richard Dierking setting up the motor:
> > http://sugarshot.org/downloads/setup.jpg
> > Richard Dierking connecting the pressure gauge:
> > http://sugarshot.org/downloads/setup1.jpg
> > Motor at full thrust:
> > http://sugarshot.org/downloads/thrusting.jpg
> > Gauge reading at full thrust:
> > http://sugarshot.org/downloads/gaugereading.jpg
> > DD-slot grain details:
> > http://sugarshot.org/downloads/dd_grain.pdf
> > Video:
> > http://www.youtube.com/watch?v=h1mYHtsD7a8&feature=youtu.be
> > (video courtesy Rick Maschek)
> >
> > -Richard has made further progress on fabricating the carbon
> > composite
> > nozzle exhaust cone for the VIC-2 motor. All 10 plies of carbon
> > prepreg were wrapped around the mandrel. After each ply was laid,
> > heat-shrink tape was wrapped around the prepreg, then shrunk using a
> > heat gun to consolidate the layers. The product was then vacuum
> > bagged
> > in preparation for curing. Curing will be done in an autoclave at
> > elevated temperature (300F/150C) and pressure (4 bar).
> > --------------------------
> > -Sugar Shot to Space is on facebook. Check us out.
> > http://tinyurl.com/2exr92k
> >
> 
> 
> 
> 

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