From 028cb830cf30c361a13698936805f91e14ef450f Mon Sep 17 00:00:00 2001 From: Bdale Garbee Date: Sat, 4 Jun 2011 13:48:19 -0600 Subject: [PATCH] add a bunch of 2YikStik text --- rockets/airframes/2YikStik/index.mdwn | 49 +++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/rockets/airframes/2YikStik/index.mdwn b/rockets/airframes/2YikStik/index.mdwn index c1a85ae..d8ca2fa 100644 --- 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. +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. + ## Publicity ## Flights -- 2.30.2