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

  • From: John Resler <johnmresler@xxxxxxxxx>
  • To: sugarshot@xxxxxxxxxxxxx
  • Date: Thu, 26 Dec 2013 07:08:23 -0700

Eric,
This kind of 'flame war' is inappropriate for this list. I have followed this project for some time and the individuals here are highly competent. I am not saying a mistake was made here because I was not part of the experiment but as an engineer for the last 15 years I can say with expertise that mistakes are made in engineering, it is part of the process. Please keep unproductive comments to yourself.


- JR

On 12/24/2013 7:02 PM, Eric Christy wrote:
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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