From: Bdale Garbee Date: Sat, 3 Mar 2012 15:53:12 +0000 (-0700) Subject: add YikStik3 X-Git-Url: https://git.gag.com/?p=web%2Fgag.com;a=commitdiff_plain;h=f6b13304dca3118f8139ad3df6cd80f3b42b3b67;ds=sidebyside add YikStik3 --- diff --git a/rockets/airframes/2YikStik/index.mdwn b/rockets/airframes/2YikStik/index.mdwn index ed98ea6..2191bea 100644 --- a/rockets/airframes/2YikStik/index.mdwn +++ b/rockets/airframes/2YikStik/index.mdwn @@ -104,4 +104,16 @@ I kept a [log](/rockets/airframes/2YikStik/buildlog) that may be of interest. The original objective of flying 2YikStik at NCR's Mile High Mayhem 2011 was not met due to weather conditions unfavorable for a high altitude launch. -We currently hope to fly 2YikStik at [LDRS 30](http://ldrs30.org/). +We flew 2YikStik at [LDRS 30](http://ldrs30.org/) on Friday morning. The +first couple seconds were glorious! Unfortunately, we hit a wind shear layer +just as we were approaching mach, and the side pressure on the nose cone +apparently snapped the coupler behind the nose bay, causing the remainder of +the propellant to be expended sky-writing instead of going up. Way +too exciting! + +The airframe didn't get going fast enough before the incident to log any +interesting skin temperature data, but the sensor in contact with the motor +casing showed the anticipated rise as the motor burned, so we believe the +TeleScience boards were working fine. + +[YikStik3](../YikStik3/) will be our next attempt. diff --git a/rockets/airframes/YikStik3/YikStik3.ork b/rockets/airframes/YikStik3/YikStik3.ork new file mode 100644 index 0000000..adb131a Binary files /dev/null and b/rockets/airframes/YikStik3/YikStik3.ork differ diff --git a/rockets/airframes/YikStik3/index.mdwn b/rockets/airframes/YikStik3/index.mdwn new file mode 100644 index 0000000..1bf293c --- /dev/null +++ b/rockets/airframes/YikStik3/index.mdwn @@ -0,0 +1,106 @@ +# YikStik3 + +## Motivation + +This is a "replacement" for Bdale's first L3 certification airframe, +[YikStik](../YikStik), which was mostly lost... and a follow-on to +[2YikStik](../2YikStik), which had one and only one "way too exciting" +flight at LDRS 30. We recovered the nose cone, tail cone, rail buttons, +and all of the electronics from 2YikStik. Everything else is new for this +build. + +Meanwhile, Robert became interested in measuring the temperature of a nose +cone and a fin on a rocket at speeds above Mach. This led Bdale to design +a [TeleMetrum](http://altusmetrum.org/TeleMetrum) companion board called +[TeleScience](http://altusmetrum.org/TeleScience) capable of hosting up to +12 NTC thermistors for temperature data collection. +As was the case with 2YikStik](../2YikStik), the plan is to fly two +[TeleMetrum](http://altusmetrum.org/TeleMetrum)+[TeleScience](http://altusmetrum.org/TeleScience) +setups, one mounted in the nose cone and one mounted in the fin can. The +one in the fin can will be responsible for apogee deployment, and the one in +the nose cone will handle main deployment. + +We will again fly a custom 98mm nose cone with the temperature sensors +embedded in the glass layers made for us by Jeff Lane of +[Shock Wave Rocketry](http://shockwaverocketry.com/). + +## Design Details + +* 98mm [Performance Rocketry](http://performancerocketry.com) G-10 convolute glass air frame +* 75mm [PML](http://www.publicmissiles.com) phenolic motor mount +* [Shock Wave Rocketry](http://shockwaverocketry.com/) fiberglass 98mm Von Karman 6:1 nose cone +* custom fins, using 3/16 inch birch plywood laminated with carbon fiber + and a fibreglass sanding veil +* 3/8 inch birch plywood centering rings and bulkheads, CNC milled, the two + that hold the fins are double thickness (3/4 inch) and notched for perfect + fin alignment. + +The OpenRocket design file is +[YikStik3.ork](/rockets/airframes/YikStik3/YikStik3.ork). + +### 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 1000 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. + +## Build + +Parts gathered during late 2011 and early 2012. Built underway in early +March of 2012. + +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. + +We're moving from the Giant Leap Rocketry 98mm Magnaframe-based Dynawind to +G-10 glass tubing this time around. Dynawind is lighter and strong enough, +but we want to use glass couplers this time around for more strength, and +that leads to fit issues with the Magnaframe-based Dynawind tubing. So even +though it's slightly heavier, we're going with an all-gladd build this time. +We'll lose a little bit of max velocity, but hopefully it'll all hang together +this time! + +The tailcone is a no-longer-available Giant Leap 98-75mm Slimline tailcone +recovered from 2YikStik's wreckage. + +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. + +Will add a pointer to build photos here once they are available. + +## Publicity + +## Flights + +The intended first flight of YikStik3 will be at NCR's Mile High Mayhem 2012 +on an as-yet-unreleased [Cesaroni](http://pro38.com) Pro75 6xl Imax reload +tentatively designated 9874M2245, which is a 92.7% M with approximately +4.4 seconds burn time. It's going to be one heck of a ride! diff --git a/rockets/airframes/index.mdwn b/rockets/airframes/index.mdwn index 40f1b3d..46a6c94 100644 --- a/rockets/airframes/index.mdwn +++ b/rockets/airframes/index.mdwn @@ -35,6 +35,10 @@ the meantime, these are a few of the projects that mean the most to us: ### Others +* [YikStik3](./YikStik3) + 98mm airframe with 75mm motor mount, sturdier replacement for + [2YikStik](./2YikStik) + * [2YikStik](./2YikStik) 98mm airframe with 75mm motor mount, in homage to [YikStik](./YikStik)