add a bunch of 2YikStik text

diff --git a/rockets/airframes/2YikStik/index.mdwn b/rockets/airframes/2YikStik/index.mdwn
index c1a85ae854b59ad550d5576f06dd9035cb72644e..d8ca2fa358912717dc32c266ae2a28d658c9fd42 100644 (file)
--- a/rockets/airframes/2YikStik/index.mdwn
+++ b/rockets/airframes/2YikStik/index.mdwn
@@ -45,6 +45,55 @@ The OpenRocket design file is
 
 Parts gathered during October 2010.  Built mostly during April and May 2011.
 
 
 Parts gathered during October 2010.  Built mostly during April and May 2011.
 

+The nose cone was custom fabricated by Jeff Lane at 
+[Shockwave Rocketry](http://shockwaverocketry.com), with thermistors embedded.
+
+The fins are 3/16 inch birch ply, tapered on the leading and trailing edges,
+then covered with one layer of 5.7 oz 2x2 twill carbon fiber and a layer of
+6 oz glass as a sanding veil, all vacuum bagged with West Systems laminating
+epoxy using a kitchen food saver appliance.
+
+The airframe tubing is Giant Leap Rocketry 98mm Magnaframe-based Dynawind,
+except for a short section behind the nose cone that uses the older phenolic
+based Dynawind because of the slightly larger inside diameter being a better
+fit for the glass nose cone shoulder.  
+
+The tailcone is a no-longer-available Giant Leap 98-75mm Slimline tailcone.
+
+All rings and bulkheads were cut using a CNC milling machine from 3/8 inch
+birch plywood.  The fin forward and leading edge rings are made from 3/4 inch
+thick assemblies made by laminating two such rings with wood glue, to provide
+sufficient depth for milled fin slots.
+
+Assembly techniques were "nothing special" except for the electronics...
+
+### Thermistors ###
+
+The temperature sensors chosen are 0.8 mm diameter glass bead NTC thermistors
+made by EPCOS, model B57540G0303F000.  These were chosen because of their
+small size, and turn out to have a very fast response time to changing
+temperatures. 
+
+The leads were extended with 30 gauge wire wrap wire using twisted pairs of
+black plus a color.  The colored lead was insulated from the bead back over
+the solder joint using 1/16 inch heat shrink tubing.  The epoxy used for the
+nose cone and fin was tested and confirmed to have essentially no 
+conductivity.
+
+### Electronics ###
+
+The airframe geometry led us to decide to build two electronics bays, one in
+the airframe immediately aft of the nose cone, and the other in the fin can.  
+Each bay holds a production
+[TeleMetrum](http://altusmetrum.org/TeleMetrum), a prototype companion 
+board called [TeleScience](http://altusmetrum.org/TeleScience), a 900 mAh
+LiPo battery, and a power switch.
+
+The TeleScience board supports connection of up to 12 NTC thermistors along
+with other capabilities.  
+
+Installing the electronics in the fin can bay was .. interesting.  More later.
+

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