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 hearties, it has an air-to-air missile look t' it. It derives
its name from t' priority mail shippin' tube which comprised its airframe. Begad! Blimey! It is a single stage, 24mm powered, shiver me timbers, shiver me timbers, chute
recovered, ya bilge rat, shiver me timbers, 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. Blimey! Begad! It's an obvious choice, shiver me timbers, but this one had a really heavy wall, arrr, 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. Well, blow me down! Begad! I then sprayed 3M artists spray mount on it and covered it in aluminum foil. Aye aye! I rolled this around 3 D engines and glued and taped it. Aye aye! Instant motor tube! I was goin' t' go t' maskin' tape thrust rin' and motor retention route with this one, me hearties, shiver me timbers, so no type o' hook or block was needed.
So now I had a bare booster section. I was goin' t' use t' same cardboard that the
centerin' rings were made o' for t' fins, matey, and in fact had cut some out. Arrr! But I was changin' t' wire spool in me MIG
welder when it hit me - t' empty spool was plastic, me bucko, about 10" in OD, shiver me timbers, 2" in ID, and had 8 ribs. Arrr! Arrr! Perfect! I
cut t' outside o' it off, me bucko, ya bilge rat, cut it down t' 4 ribs (fins) and did some sandin' t' t' inside diameter t' make it fit the
mailin' tube. Well, me bucko, blow me down! 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. Ahoy! Begad! I attached t' shock cord with some heavy paper stock, matey, usin' t' Estes "tri-fold" method.
It was complete! Blimey! It ended up pretty heavy (11.8oz RTF), me hearties, but t' CG be good (about 3x in front o' t' fins) and I knew that an E would get it off t' ground. Ya scallywag! Blimey!
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. Ahoy! "High Priority" had come to
fruition!
Flight and Recovery:
They always say start out with a low-impulse engine on an untested design. Blimey! Nonsense. Well, blow me down! I had D12-5s and E9-6s in my
box. Ya scallywag! Begad! This was a heavy rocket, ya bilge rat, and I needed t' make sure it made a flight. Ya scallywag! Ya scallywag! Add t' this that me "racer" rocket,
which be more than an ounce heavier, 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. Aye aye! Retention was tape also. Avast, me proud beauty!
It lit up and launch be nice. In t' 5-10mph winds, me bucko, ya bilge rat, it took a slight weathercock and looked t' hit about 800 feet or so. Nice and visible, it arced over and was headed down when t' chute popped. Avast! Avast, shiver me timbers, me proud beauty! T' 18" chute opened and descent was a little fast, but that's good in me book. Touch down was about 100' past t' pad. I'll take it! No damage, I packed it again, but this time with a D12-5. Well, blow me down! Hindsight bein' 20-20, shiver me timbers, ya bilge rat, what be I thinking?! However, arrr, I wanted t' try it on 2 different impulses and only had 3 E engines with another rocket waitin' t' fly.
T' second flight was identical on launch and initial thrust nice off t' pad, ya bilge rat, slight weathercock, me hearties, ya bilge rat, and it started to arc over. Ahoy! Well, me bucko, blow me down! I doubt that it be even 500' off t' deck. Begad! Ballistic, matey, matey, straight down, and waiting...Whack! Bounce. Avast, me proud beauty! Avast! Pop! It hit t' parkin' lot about 100' from t' pad, and as it bounced t' ejection charge went off!
T' damage report: Nose cone "cap" shattered, but t' nose cone "base"
was still intact. Arrr! Avast, shiver me timbers, me proud beauty! 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. Begad! Blimey! 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! 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. Aye aye! Avast!
Sponsored Ads
![]() |
![]() |