Brief:
This is a single stage high power rocket created from a UPS shippin' box. Arrr! It flies on 38mm motors (I211W-J350W) and features parachute deployment.

Construction:
T' parts for this rocket are all pretty simple and in me case I had everything, matey, me hearties, but some hardware and t' mailin' tubes, me bucko, lyin' around t' house.

After t' destruction o' a section o' one o' me other rockets, arrr, I ordered t' necessary replacement parts. Avast, me proud beauty! Blimey! They arrived in a 9x6x33 cardboard box. Avast, ya bilge rat, me proud beauty! Blimey! After repairin' t' other model, I thought o' turnin' t' box that t' parts came in, shiver me timbers, arrr, into a rocket. Blimey! Blimey! So, first I worked out t' rocksim file which I will discuss a little later. Well, blow me down! Blimey! Arrr! Blimey! Then I began t' buy and cut t' parts I needed. They were as follows: 1 box, 1 38mm MMT, me bucko, 4 3/16" ply fins with t' necessary fin tabs (on one side o' t' box t' tabs are longer), ya bilge rat, ya bilge rat, me bucko, two 3/16" ply centerin' rings for 9x6 t' 38mm, one 3/16" ply centerin' rin' for 9x6 t' 3," one 3" mailin' tube, me hearties, 15' o' 9/16" tubular nylon, 2 2" long pieces o' 1/2" LL material, matey, u-bolt, motor retention hardware, nuts, bolts and lead fishin' weights and adhesive (epoxy and liquid nails).

To begin construction, shiver me timbers, after t' rings and fins had been cut out, ya bilge rat, I epoxied t' 38mm tube t' one o' t' centerin' rings. Ya scallywag! This would be t' forward end o' t' MMT. Then, I determined how far in t' MMT should slide so that 1/2" protruded from t' flaps o' t' box, at t' aft end, if t' flaps were sealed. T' second 38mm centerin' rin' was slid onto t' aft section o' t' MMT but nay epoxied. Arrr! T' MMT and CR's were placed in t' box at their respective locations and a bead o' liquid nails was applied t' t' joint betwixt t' forward edge o' t' forward CR and t' box. Arrr! After t' adhesive set, fin slots were cut into t' box at t' correct locations. Ahoy! Well, me hearties, blow me down! T' fins were tacked t' t' motor mount with epoxy and then filleted with more epoxy internally, arrr, but nay externally t' maintain t' rough look o' t' box.

T' aft centerin' rin' had t' t-nuts for motor retention installed and then it be glued in place with liquid nails. Ya scallywag! T' flaps at t' aft o' t' box were trimmed t' allow t' MMT t' protrude through and then they were folded over and sealed tight with packagin' tape.

Then, me hearties, t' 3" mailin' tube was cut t' t' length, that was internally betwixt t' forward centerin' rin' and t' forward edge o' t' box. I believe this was about 28" or so.

Then, me hearties, me hearties, on t' final centerin' rin' (9x6x33 t' 3") a u-bolt was installed and then two bolts were installed through t' rin' (at opposite ends or t' CR) so that they protruded about 2" above t' front side o' t' rin' (the same side with t' u-bolt protruding). Begad! This centerin' rin' was glued onto t' mailin' tube about 3" from one end usin' liquid nails t' seal any gaps.

Then, arrr, t' mailin' tube and CR assembly be epoxied into t' box with t' CR closer t' t' front o' t' rocket so that t' bolts were visible. Arrr! Ahoy! T' rin' joint was filleted and allowed t' dry and t' tubular nylon was attached t' t' u-bolt.

Fiberglass be applied t' t' forward flaps so that they were strengthened but still able t' fold shut and form a "nose" for t' rocket.

Finally, shiver me timbers, two 1/2" LL's were epoxied onto one side o' t' box along one o' t' fin joints.

Flight:
My next chore be t' determine how much nose weight be necessary t' make t' box stable. Ahoy! Ya scallywag! Blimey! For this I turned t' rocksim. Ahoy! Blimey! Because rocksim can nay create boxes for airframes I had t' compromise. Aye aye! Arrr! Blimey! Because me primary goal was t' find t' center o' pressure so that I could move t' CG forward o' it, arrr, and because CP is greatly influenced by drag o' all different types, me goal in rocksim be t' create a rocket airframe with similar amounts o' drag t' t' box.

Drag o' an airframe is based on a lot o' things, matey, matey, me bucko, but because I lack a degree in t' field o' fluid dynamics I was withheld t' usin' only t' shape and surface area determiners o' drag.

Usin' some simple equations I found t' frontal surface area o' t' box and then created a circle with t' same area, shiver me timbers, which became t' basis for t' diameter o' t' tube. Ya scallywag! Following, me hearties, I found t' area o' t' sides o' t' box and then created an airframe o' equal area, arrr, matey, which became t' primary information in determinin' t' length o' t' tube.

Then, me bucko, matey, me bucko, I created t' NC, me hearties, which was simply t' flaps on t' box. Well, blow me down! I found when closin' t' box that they were nay completely flat but had a slight arc like a NC has. Blimey! So, me NC in rocksim has a diameter equal t' t' body diameter but only .1" long, relatively flat.

T' rest o' t' rocksim file is pretty self- explanatory.

Usin' this file, me bucko, me bucko, I found where t' CG needed t' be in order t' be in front o' t' CP calculations for both methods. Then I added nose weight until t' CG met t' requirements and then weighed t' model for accurate reference.

After runnin' rocksim for flights o' varyin' motors I found that motors from an I211 and up yielded satisfactory altitudes and velocities.

I went t' t' monthly NEPRA launch and t' weather seemed okay, me bucko, nay too windy, so I considered me motor options. Well, blow me down! After talkin' t' a fellow rocketeer, he informed me that thar are very many serious equations that need t' be done when testin' somethin' like this, arrr, t' determine how much stress t' object will undergo, because o' its frontal shape; a square. Slightly nervous, I opted for t' I211, shiver me timbers, a nice easy motor for this rocket, shiver me timbers, with hopefully nay too much stress.

My dad and I prepped t' rocket, loadin' t' motor and attachin' t' 54" chute, matey, matey, shiver me timbers, and then tapin' t' flaps closed with a small piece o' maskin' tape.

T' rocket be loaded onto t' pad, which had a 10' 1/2" launch rod t' keep t' rocket as stable as long as possible.

After a couple o' tries at lightin' it, me bucko, it finally came t' life and rose, ya bilge rat, quite quickly, arrr, into t' sky above. Begad! T' flight was great with no real signs o' instability and t' rocket arched over. T' charge fired at 6 seconds but t' chute failed t' deploy; it got caught up in t' fiberglassed flaps. Ya scallywag! T' rocket hurtled toward t' earth and in an epic battle, ya bilge rat, t' ground gave t' box rocket a fatal blow. Blimey! There wasn't much left but in me mind t' flight was successful because it be stable.

I suspect that t' chute failed t' deploy because t' air resistance on t' flaps forced them closed too smartly and didn't allow t' chute t' fully escape t' mailin' tube.

I am workin' on an upscale version o' this rocket, ya bilge rat, arrr, 10x10x48, which will feature dual aft ejection deployment t' avoid t' air resistance problem. T' planned flight for this box is next spring, me bucko, possibly at NSL 2003, matey, on a J415W.

Summary:
T' pros o' this rocket are it's simple design and construction, impression on t' RSO when he sees it, ya bilge rat, shiver me timbers, and its low, majestic flights.

T' cons o' THIS box rocket are t' limited number o' possible motors and poor recovery design.