From: Bdale Garbee Date: Mon, 10 Jul 2017 18:41:58 +0000 (-0600) Subject: add CorporateColors to airframes X-Git-Url: https://git.gag.com/?p=web%2Fgag.com;a=commitdiff_plain;h=1055014f4ed02d8dae27c314f0c931be10c394f3 add CorporateColors to airframes --- diff --git a/bdale/quotes.mdwn b/bdale/quotes.mdwn index b2d4063..8bcc4ed 100644 --- a/bdale/quotes.mdwn +++ b/bdale/quotes.mdwn @@ -7,6 +7,10 @@ that I've chosen to pick up and carry with me... On Life ------- +

+"Taste your words before you spit them out." +
-- Andy Card

+

"That which hinders your task is your task." @@ -423,7 +427,7 @@ increase my confidence, I didn't bother reading most of it."

"The difference between Open Source and Free Software is that Free Software people know there's a difference, and Open Source people try to pretend -there isn't." +there isn't."

Things Said About Me -------------------- diff --git a/rockets/airframes/CorporateColors.mdwn b/rockets/airframes/CorporateColors.mdwn new file mode 100644 index 0000000..b71506b --- /dev/null +++ b/rockets/airframes/CorporateColors.mdwn @@ -0,0 +1 @@ +[[!map pages="rockets/airframes/CorporateColors/* and ! rockets/airframes/CorporateColors/*/*"]] diff --git a/rockets/airframes/CorporateColors/CorporateColors.ork b/rockets/airframes/CorporateColors/CorporateColors.ork new file mode 100644 index 0000000..444ced3 Binary files /dev/null and b/rockets/airframes/CorporateColors/CorporateColors.ork differ diff --git a/rockets/airframes/CorporateColors/index.mdwn b/rockets/airframes/CorporateColors/index.mdwn new file mode 100644 index 0000000..f62ab0f --- /dev/null +++ b/rockets/airframes/CorporateColors/index.mdwn @@ -0,0 +1,67 @@ +# Corporate Colors + +## Motivation + +This is the airframe Bdale built for his second attempt at hitting +Mach 3. This is a step along a learning path building confidence before +trying to assemble a minimum-diameter airframe to fly a CTI O3400 someday. + +The first attempt was made with a very similar airframe that was assembled +entirely +using [West System](http://www.westsystem.com) epoxy, including the fin +can tip to tip laminations that were all done in a single vacuum bagging +operation. That airframe flew at Airfest in 2016 on a CTI M2245, and was at +about Mach 2.91 when the fin can +came apart. Post-flight analysis suggested the leading edge of the tip to +tip laminations got hot enough for the epoxy to soften allowing the carbon +fiber to be ripped off... West System is and will continue to be my go-to +epoxy for normal airframe builds, and worked great on a previous project +that got to Mach 2.21... but with a glass transition temperature of 129-242 F, +it's just not up to the challenge of staying together above Mach 3! + +So, for this build, the plan was to use essentially the same design, but +switch to one of the Cotronics high-temperature epoxies. Others have talked +about using lesser epoxy for the bulk of the fin build-up laminations and then +just using Cotronics as a top coat, or the thicker version to build up leading +edges, but it seemed to me that using the lower viscosity type for all of the +fin can laminations might be the easiest way to go. After studying the +options, I chose [Duralco 4461](https://www.cotronics.com/vo/cotr/pdf/4461.pdf) +which is supposed to be good to 500 F with a suitable post-cure. A pint kit +with shipping cost me nearly $130, but I used much less than half the kit +building this airframe. So, in the grand scheme of things, it's not that +expensive. + +## Design Details + +This is basically a "2 fins and a nose cone" design, using a single 5 foot +length of filament would fiberglass airframe, a filament would nose cone +with aluminum tip, and plywood fins covered with tip to tip carbon fiber. + +The fins were made using high quality 1/8" Baltic birch plywood cores glued +into slots milled in the airframe tube, then 3 layers of 5.8 oz 2x2 twill +carbon fiber were laminated "tip to tip" across the airframe through each +valley. My normal peel-ply and breather were used, and the entire fin can +was laminated and vacuum bagged in one operation to yield a full chemical +bond across all fin edges. + +Actually, the inner carbon fiber layer was cut smaller +to not go all the way to the fin edges, the outer two were big enough to go +past the edges slightly to allow for sanding back to the final fin shape after +initial cure. The middle layer was rotated 45 degrees from the inner and +outer layers, giving us fibers in 4 directions. + +The OpenRocket design file is +[CorporateCollors.ork](/rockets/airframes/CorporateColors/CorporateColors.ork), +and that design file plus all content on this page are released under the [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/legalcode) license. + +### Electronics ### + +## Build + +## Photos + +I've put all the [build photos](http://gallery.gag.com/rockets/CorporateColors/Build/) +I took together in one place. + +## Result and Lessons Learned + diff --git a/rockets/airframes/index.mdwn b/rockets/airframes/index.mdwn index e08957a..ab4026e 100644 --- a/rockets/airframes/index.mdwn +++ b/rockets/airframes/index.mdwn @@ -35,8 +35,8 @@ the meantime, these are a few of the projects that mean the most to us: ### Others -* [AMRAAM](./AMRAAM) - 1/2-scale kit build of an AMRAAM missile with 54mm motor mount +* [CorporateColors](./CorporateColors) + 75mm minimum-diameter airframe built to exceed Mach 3 * [AMRAAM](./AMRAAM) 1/2-scale kit build of an AMRAAM missile with 54mm motor mount diff --git a/rockets/index.mdwn b/rockets/index.mdwn index 9711df4..19aacc2 100755 --- a/rockets/index.mdwn +++ b/rockets/index.mdwn @@ -12,12 +12,12 @@ being father and son affairs... [Bdale](http://www.gag.com/~bdale) is [NAR](http://nar.org/) Sr member 87103 and [Tripoli](http://tripoli.org/) member 12201, and holds a level 3 -high power certification. Robert is [NAR](http://nar.org/) Jr member -87104 with a Jr L1 certification, and [Tripoli](http://tripoli.org/) -member 14036. He was one of the first kids to pass the -[Tripoli Mentoring Program](http://www.tripoli.org/TMP) -exam, and at age 16 can now often be spotted flying research motors at -Tripoli launches! +high power certification. Robert is [NAR](http://nar.org/) Sr member +87104 and [Tripoli](http://tripoli.org/) member 14036, and also holds a +level 3 high power certification. Robdert was one of the first kids to +pass the [Tripoli Mentoring Program](http://www.tripoli.org/TMP) +exam, and flew a lot of high power including a fair number of research +motors in mentored projects before turning 18... ## [Airframes](airframes) ## @@ -31,16 +31,20 @@ Bdale's Flickr Photostream< We have family memberships in (and regularly enjoy flying our models with!) local clubs -[COSROCS](http://cosrocs.org/), which is -[NAR](http://nar.org/) section #515, -[SCORE](http://scronline.net), which is -[NAR](http://nar.org/) section #632, and -[NCR](http://ncrocketry.org), which is -[NAR](http://nar.org/) section #565, and -[Tripoli](http://www.tripoli.org/) Prefecture #72. +[Tripoli Colorado](http://www.tripolicolorado.org/), +[SCORE](http://scronline.net), +and +[NCR](http://ncrocketry.org). + We have also flown with -[Tripoli Colorado](http://www.tripolicolorado.org/) and -[ARS](http://www.arsabq.org/). +[ARS](http://www.arsabq.org/), +[COSROCS](http://cosrocs.org/), +[Kloudbusters](http://kloudbusters.org/), +[Metra](http://metrarocketclub.org/), +[NRVR](http://nrvr.org/), +[NZRA](http://www.nzrocketry.org.nz/), +and +[QRS](https://qldrocketry.com/). ## Vendors ##