[SS2S-Main] Sugar Shot Weekly Activity Report -- Apr​.7-20, 2014

  • From: Richard Nakka <richard.rocketry@xxxxxxxxx>
  • To: sugarshot@xxxxxxxxxxxxx
  • Date: Wed, 23 Apr 2014 20:27:58 -0600

Highlights of recent developments on the DoubleSShot project
---------------------------------------------------------------------------------------
- Florin Mingireanu reports good progress with the new Launch
Controller that will be used for the VIC series of static motor tests.
Florin is awaiting delivery of special-purpose switches that Richard
Nakka shipped last week.
  Photos of circuit board:
http://sugarshot.org/downloads/dscn1634a.jpg
http://sugarshot.org/downloads/dscn1637a.jpg

- Liam McQuellin has provided a rendering of the thermocouple board
that he is currently designing and building for SS2S motor temperature
measurements:
http://sugarshot.org/downloads/render.png

- Richard has completed fabrication of a conditioning circuit that
interfaces a load cell and two pressure sensors to the DATAQ DI-149
data acquisition unit. This system will be used for the VIC series of
motor tests.
  Photos:
http://sugarshot.org/downloads/test_equipment_003a.jpg
http://sugarshot.org/downloads/test_equipment_005a.jpg

-An Avionics telecon was held Sunday April 13th , and was attended by
Chris King, Mattias Lampe, and Richard Nakka. Mattias reported
progress on fabrication of a simplified de-spin system to test his
controller concept. The next telecon is scheduled for April 27th.

-Craig Peterson reports that he has completed machining of “pyrogen
holders” for the DSS TM-4 motor, which will be test fired this summer.
The pyrogen holders, machined from 2011 aluminum alloy, will be used
to hold a pair of Estes A3-4 motors which will serve as pyrogen
igniters.
    Photos:
http://sugarshot.org/downloads/dscn2141.jpg
http://sugarshot.org/downloads/dscn2144.jpg
http://sugarshot.org/downloads/dscn2146.jpg

-The chamber pressure data for the April 5th test firing of the
4-grain DD-slot motor has been extracted from the video footage and
plotted.
http://sugarshot.org/downloads/pressure-curve-1.jpg
The pressure curve deviates significantly from the design curve. A
similar result can be seen for the earlier motor firing:
http://sugarshot.org/downloads/pressure-curve-2.jpg
Failure of the inhibitor coating to effectively prevent burning on the
curved side of the grain is being investigated as the most likely
cause. This is despite meticulous effort on Rick’s behalf to apply the
fiberglass cloth in such a manner that no air is trapped. Even small
pockets of trapped air allows hot gases to penetrate in between the
inhibitor layer and the propellant, resulting in unanticipated burning
of those portions of the grain. A modified (and simplified) inhibiting
process will be tried. Instead of wet layup of the fiberglass,
suitable pieces of prepreg material will be placed in the casting
mould, then the propellant cast in place. The heat from the hot
propellant is expected to cure the prepreg material. This is a method
developed and successfully employed by New Zealand rocketeer Phil
Vukovich (who recently set a new altitude record for a sugar-based
rocket). A telecon was held this past Saturday to discuss the concept
and process. The telecon was attended by Rick, Richard and Phil.
Richard has subsequently shipped prepreg material to Rick to try out
the concept in the near future.

-The SS2S donor page has been updated to acknowledge the donation of a
Valor 2000 digital scale by Balanzas Digitales. This nifty 15 kg
capacity scale is being offered as a bonus prize in the SS2S Tool
Raffle.
http://sugarshot.org/sponsors.html#Donorservices

-The DATAQ sponsor link has been updated to reflect the recent
donation of a DI-149 “starter kit”.
http://sugarshot.org/sponsors.html#Mainsponsors

-SC Reev River Aerospace SRL has been added to our sponsor page to
acknowledge the recent donation of electronic components for the
Launch Controller that Florin is currently building.
http://sugarshot.org/sponsors.html#Donorservices

ONLY ONE WEEK LEFT……EARLY BIRD BONUS PRIZE! In addition to the five
tool lots, the winner of an “early bird” bonus prize will be drawn on
April 30th. All raffle ticket purchasers are eligible, as long as the
ticket is purchased prior to April 30th. The prize is an OHAUS Valor
2000 digital scale with 15 kg (30 lb) capacity !  Great for weighing
rocket components, propellant ingredients, etc. Generously donated by
Balanzas Digitales (http://www.balanzasdigitales.com/). The value is
approximately $300
USD.
   Photo of the prize:
http://sugarshot.org/downloads/ohaus-valor2000.jpg

For more details and technical specifications, check out this link:
http://www.testequipmentdepot.com/ohaus/compact-bench-scales/valor-2000/food-bench-scale-v22pwe15t.htm

PURCHASE YOUR TICKET AND SUPPORT SUGAR SHOT IN OUR EFFORT TO REACH
SPACE ON THE POWER OF SUGAR.
http://sugarshot.org/tool-raffle/index.html
---------------------------
-Sugar Shot to Space is on facebook. Check us out.
http://tinyurl.com/2exr92k

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  • » [SS2S-Main] Sugar Shot Weekly Activity Report -- Apr​.7-20, 2014 - Richard Nakka