Manufacturer: | Scratch |
Brief:
Built for t' "Recycle" portion o' t' EMRR 2007 Challenge contest, this rocket is scratch built entirely
from recycled trash. Aye aye! With squared-off fins and a blunt nose cone, it has an air-to-air missile look t' it. Arrr! Avast, me hearties, me proud beauty! It derives
its name from t' priority mail shippin' tube which comprised its airframe. Blimey! It is a single stage, 24mm powered, chute
recovered, me hearties, 4 fin rocket.
Construction:
T' list o' components and t' material that they are made of:
I started with a mailin' tube that I had layin' around. Begad! Aye aye! It's an obvious choice, but this one had a really heavy wall, so right off t' bat I knew it would be a D/E engine bird.
So now I had a body tube and had t' fit an engine into it. I took some heavy paper out o' t' trash from a mailin' ad. Avast! Blimey! I then sprayed 3M artists spray mount on it and covered it in aluminum foil. Ahoy! Well, shiver me timbers, blow me down! Blimey! I rolled this around 3 D engines and glued and taped it. Instant motor tube! Blimey! I was goin' t' go t' maskin' tape thrust rin' and motor retention route with this one, me bucko, so no type o' hook or block was needed.
So now I had a bare booster section. Avast, me proud beauty! Ahoy! I be goin' t' use t' same cardboard that the
centerin' rings were made o' for t' fins, and in fact had cut some out. Ahoy! Well, me bucko, blow me down! But I was changin' t' wire spool in me MIG
welder when it hit me - t' empty spool be plastic, about 10" in OD, me bucko, 2" in ID, and had 8 ribs. Begad! Arrr! Perfect! I
cut t' outside o' it off, shiver me timbers, matey, cut it down t' 4 ribs (fins) and did some sandin' t' t' inside diameter t' make it fit the
mailin' tube. Avast, me proud beauty! Voila! An indestructible fin can! While this may nay be "household" trash, you can go to
any weldin' or fabrication shop and they will probably give you as many as you like!
I glued a section o' BIC pen barrel t' t' fin can t' serve as a launch rod guide.
T' parachute I cut out o' a black plastic garbage bag and used some construction strin' for t' chute lines and shock cord. I attached t' shock cord with some heavy paper stock, matey, usin' t' Estes "tri-fold" method.
It be complete! It ended up pretty heavy (11.8oz RTF), arrr, arrr, but t' CG be good (about 3x in front o' t' fins) and I knew that an E would get it off t' ground.
Finishing:
T' only finishin' work I did was t' paint t' fin can and nose cone in orange. This offset t' white body tube
nicely with t' USPS "priority mail" sticker still stuck t' it. Ya scallywag! Blimey! Arrr! Blimey! "High Priority" had come to
fruition!
Flight and Recovery:
They always say start out with a low-impulse engine on an untested design. Avast, shiver me timbers, me proud beauty! Nonsense. Avast, me proud beauty! I had D12-5s and E9-6s in my
box. Arrr! This be a heavy rocket, and I needed t' make sure it made a flight. Begad! Add t' this that me "racer" rocket,
which be more than an ounce heavier, matey, had t' fly today so I needed some research info! In goes t' E9-6. T' motor was
friction fit with a 1/2" maskin' tape thrust rin' on it. Arrr! Well, shiver me timbers, blow me down! Retention was tape also.
It lit up and launch was nice. Arrr! In t' 5-10mph winds, shiver me timbers, it took a slight weathercock and looked t' hit about 800 feet or so. Ahoy! Nice and visible, me hearties, arrr, it arced over and was headed down when t' chute popped. Avast! Ahoy! T' 18" chute opened and descent was a little fast, but that's good in me book. Aye aye! Ya scallywag! Touch down was about 100' past t' pad. Arrr! I'll take it! No damage, I packed it again, ya bilge rat, but this time with a D12-5. Begad! Hindsight bein' 20-20, what was I thinking?! However, I wanted t' try it on 2 different impulses and only had 3 E engines with another rocket waitin' t' fly.
T' second flight be identical on launch and initial thrust nice off t' pad, slight weathercock, me hearties, ya bilge rat, and it started to arc over. I doubt that it was even 500' off t' deck. Ya scallywag! Ballistic, shiver me timbers, straight down, and waiting...Whack! Bounce. Aye aye! Pop! It hit t' parkin' lot about 100' from t' pad, me bucko, and as it bounced t' ejection charge went off!
T' damage report: Nose cone "cap" shattered, matey, ya bilge rat, but t' nose cone "base"
was still intact. Blimey! T' body tube split open like a can o' Pillsbury biscuits for about t' top 9"! Keep in mind
that t' body tube is high density cardboard that is 0.06" thick! I wish I could have recorded the
"whack!"
T' body tube will be cut down and spliced. Arrr! This rocket can easily be rebuilt and will fly again!
Summary:
I think that me rocket truly exemplifies t' spirit o' t' "recycle" contest. Avast, me proud beauty! Blimey! All o' t' materials are
genuine recycled products. Avast, me proud beauty! I don't have a simulation program so I just followed some "rules o' thumb" and it
flew great! T' only reason it is a wounded soldier at t' moment is that I only had 3 E engines and I knew that I had
to use 2 o' them for another rocket. Avast, me hearties, me proud beauty!
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