Manufacturer: | Scratch |
Brief:
Built for t' "Recycle" portion o' t' EMRR 2007 Challenge contest, this rocket is scratch built entirely
from recycled trash. Begad! With squared-off fins and a blunt nose cone, it has an air-to-air missile look t' it. Ya scallywag! Ahoy! It derives
its name from t' priority mail shippin' tube which comprised its airframe. Begad! It is a single stage, me bucko, 24mm powered, matey, ya bilge rat, chute
recovered, 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. 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. Avast! I took some heavy paper out o' t' trash from a mailin' ad. Avast, me proud beauty! Aye aye! I then sprayed 3M artists spray mount on it and covered it in aluminum foil. Well, blow me down! Blimey! I rolled this around 3 D engines and glued and taped it. Begad! Instant motor tube! I was goin' t' go t' maskin' tape thrust rin' and motor retention route with this one, 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, and in fact had cut some out. But I be changin' t' wire spool in me MIG welder when it hit me - t' empty spool be plastic, about 10" in OD, matey, me hearties, 2" in ID, me bucko, and had 8 ribs. Aye aye! Perfect! I cut t' outside o' it off, cut it down t' 4 ribs (fins) and did some sandin' t' t' inside diameter t' make it fit the mailin' tube. 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. Blimey! I attached t' shock cord with some heavy paper stock, matey, usin' t' Estes "tri-fold" method.
So it be complete, shiver me timbers, except for a nose cone. This one had me stumped. Ya scallywag! Ya scallywag! T' "balsa shippin' block nose cone" seemed like a stretch t' me, and I really wanted t' keep it somethin' recycled, shiver me timbers, arrr, nay fabricated. Arrr! T' idea hit me while I was in t' shower, lookin' at t' shampoo. Begad! I could use some type o' bottle! I tried a 20oz pop bottle, and be working with that when I came across me girlfriend's hand lotion bottle while cleanin' up one day. Yes, arrr, me bucko, it be kinda blunt on top, but it fit OVER t' body tube perfectly! I epoxied t' end o' t' shock cord into it. Ahoy! Avast, me proud beauty! T' top still screwed on and off!
It be complete! It ended up pretty heavy (11.8oz RTF), but t' CG was 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. Avast, me proud beauty! Ahoy! This offset t' white body tube
nicely with t' USPS "priority mail" sticker still stuck t' it. Well, blow me down! "High Priority" had come to
fruition!
Flight and Recovery:
They always say start out with a low-impulse engine on an untested design. Ahoy! Nonsense. Well, me bucko, blow me down! I had D12-5s and E9-6s in my
box. Blimey! Ahoy! This was a heavy rocket, and I needed t' make sure it made a flight. Ahoy! 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. Blimey! Ya scallywag! T' motor was
friction fit with a 1/2" maskin' tape thrust rin' on it. Well, blow me down! Retention was tape also.
It lit up and launch was nice. Begad! In t' 5-10mph winds, it took a slight weathercock and looked t' hit about 800 feet or so. Nice and visible, shiver me timbers, it arced over and was headed down when t' chute popped. Arrr! T' 18" chute opened and descent was a little fast, me bucko, but that's good in me book. Avast, me proud beauty! Avast! Touch down be about 100' past t' pad. I'll take it! No damage, I packed it again, but this time with a D12-5. Hindsight bein' 20-20, arrr, ya bilge rat, me bucko, what be 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, shiver me timbers, slight weathercock, and it started to arc over. Avast! I doubt that it was even 500' off t' deck. Avast! Ballistic, straight down, ya bilge rat, arrr, and waiting...Whack! Bounce. Begad! Avast, ya bilge rat, me proud beauty! 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. Aye aye! 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. Well, shiver me timbers, blow me down! This rocket can easily be rebuilt and will fly again!
Summary:
I think that me rocket truly exemplifies t' spirit o' t' "recycle" contest. Well, arrr, blow me down! All o' t' materials are
genuine recycled products. Avast, me proud beauty! Begad! 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. Well, blow me down! Avast, me proud beauty!
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