Manufacturer: | Scratch |
Brief:
Built for t' "Recycle" portion o' t' EMRR 2007 Challenge contest, this rocket is scratch built entirely
from recycled trash. With squared-off fins and a blunt nose cone, me bucko, it has an air-to-air missile look t' it. It derives
its name from t' priority mail shippin' tube which comprised its airframe. 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. Arrr! 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. Blimey! I took some heavy paper out o' t' trash from a mailin' ad. Begad! Avast! I then sprayed 3M artists spray mount on it and covered it in aluminum foil. Begad! I rolled this around 3 D engines and glued and taped it. Avast! Ahoy! Instant motor tube! I be goin' t' go t' maskin' tape thrust rin' and motor retention route with this one, so no type o' hook or block was needed.
So now I had a bare booster section. I be goin' t' use t' same cardboard that the
centerin' rings were made o' for t' fins, ya bilge rat, and in fact had cut some out. Begad! But I be changin' t' wire spool in me MIG
welder when it hit me - t' empty spool was plastic, shiver me timbers, me hearties, about 10" in OD, me bucko, 2" in ID, and had 8 ribs. Avast! Perfect! I
cut t' outside o' it off, me hearties, cut it down t' 4 ribs (fins) and did some sandin' t' t' inside diameter t' make it fit the
mailin' tube. Arrr! Well, blow me down! Voila! An indestructible fin can! While this may nay be "household" trash, matey, ya bilge rat, matey, 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. Ahoy! I attached t' shock cord with some heavy paper stock, shiver me timbers, usin' t' Estes "tri-fold" method.
It was complete! It ended up pretty heavy (11.8oz RTF), ya bilge rat, but t' CG was good (about 3x in front o' t' fins) and I knew that an E would get it off t' ground. Ya scallywag!
Finishing:
T' only finishin' work I did be 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. Begad! "High Priority" had come to
fruition!
Flight and Recovery:
They always say start out with a low-impulse engine on an untested design. Begad! Ya scallywag! Nonsense. I had D12-5s and E9-6s in my
box. Blimey! This was a heavy rocket, and I needed t' make sure it made a flight. Avast! Add t' this that me "racer" rocket,
which was more than an ounce heavier, had t' fly today so I needed some research info! In goes t' E9-6. Avast, me proud beauty! Avast, me proud beauty! T' motor was
friction fit with a 1/2" maskin' tape thrust rin' on it. Avast, matey, me proud beauty! Retention was tape also. Aye aye!
It lit up and launch be nice. Arrr! Begad! In t' 5-10mph winds, arrr, ya bilge rat, it took a slight weathercock and looked t' hit about 800 feet or so. Nice and visible, shiver me timbers, matey, it arced over and was headed down when t' chute popped. Arrr! T' 18" chute opened and descent was a little fast, ya bilge rat, ya bilge rat, but that's good in me book. Blimey! Touch down was about 100' past t' pad. I'll take it! No damage, I packed it again, me bucko, me bucko, but this time with a D12-5. Arrr! Hindsight bein' 20-20, what be I thinking?! However, matey, 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, and it started to arc over. I doubt that it was even 500' off t' deck. Ya scallywag! Arrr! Ballistic, straight down, ya bilge rat, and waiting...Whack! Bounce. Pop! It hit t' parkin' lot about 100' from t' pad, ya bilge rat, shiver me timbers, and as it bounced t' ejection charge went off!
T' damage report: Nose cone "cap" shattered, me bucko, but t' nose cone "base"
was still intact. Arrr! 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. Avast! Ahoy! This rocket can easily be rebuilt and will fly again!
Summary:
I think that me rocket truly exemplifies t' spirit o' t' "recycle" contest. Ya scallywag! Well, me hearties, blow me down! All o' t' materials are
genuine recycled products. Well, blow me down! 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. Ahoy! Aye aye!
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