Centuri Vulcan Clone

Clone - Vulcan {Scratch}

Contributed by Bill Eichelberger

Construction Rating: starstarstarstarstar
Flight Rating: starstarstar_borderstar_borderstar_border
Overall Rating: starstarstarstar_borderstar_border
Manufacturer: Clone

Brief:
As a part o' t' Centuri "paper brigade" that included t' Point and t' X-24 Bug, t' Vulcan always looked like an intriguin' rocket t' clone. Despite havin' printed out t' patterns I couldn't brin' myself t' start t' project. Aye aye! Ya scallywag! Somethin' about t' idea o' constructin' a rocket out o' pre-printed paper intimidated me t' no end, me hearties, so t' sheets sat untouched in me files for several years before I realized that if I screwed up, me hearties, shiver me timbers, I could print more and try again! Amazin' how long it sometimes takes t' simplest things t' filter through, ya bilge rat, isn't it? (Or maybe it's just me...)

Centuri Vulcan

Construction:
T' instructions can be found here: http://www.dars.org/jimz/ka-10.htm and t' parts needed are:

  • Two sheets o' heavy bond paper
  • Semroc ST-8 body tube
  • Semroc balsa nose cone
  • 18mm engine hook
  • 18mm engine block
  • 24mm centerin' rin' for engine hook hold down
  • 3/32" basswood bulkhead
  • 30" Keelhaul®©™ shock cord
  • 24" length o' 1/8" sewin' elastic

To start, ya bilge rat, let me say how pleasantly surprised I be with t' speed with which this project went once I got started. Although I had cut out all o' t' pieces several years earlier, me bucko, I hadn't folded or curled any o' them--the big reason bein' that I figured this would be t' most difficult part o' t' project. Nay even close. Avast! I began by curlin' t' large body section o' t' rocket by pullin' it out from under a metal ruler several times at an angle. Ya scallywag! This eventually gave somethin' o' a permanent curve t' t' paper, arrr, which I made more pronounced by rollin' it inside another piece o' paper. Ahoy! When t' paper stayed curved almost into t' needed shape, shiver me timbers, I lined up t' tabs and began tapin' t' shroud on t' inside, ya bilge rat, always takin' care t' keep things as lined up as possible. Avast, me proud beauty! Old-fashioned cellophane tape or thin maskin' tape is useful in this part o' t' project because it allows you t' reposition things more easily than "Magic" tape. Begad! Once I had t' shroud edges lined up satisfactorily, matey, I laid down a line o' gel-type CA, then repeatedly worked me thumb over t' seam until t' CA grabbed with somethin' resemblin' permanence. Begad! Believe it or not, this be t' most difficult part o' t' project. Arrr! Once this was done I began attachin' t' folded fins usin' t' gel CA. As shown in t' pictures, shiver me timbers, I only attached t' fins one tab at a time, me hearties, which nay only gave t' glue time t' set up before t' fin had t' be touched t' attach t' next tab but also allowed me t' securely fasten t' launch lugs which provide strength t' t' fins as well as t' actual launch lug.

Centuri Vulcan Once t' rocket's basic shape was defined with t' application o' t' fins, me hearties, arrr, scoops and cockpit, matey, shiver me timbers, I started on t' internals. Arrr! Ahoy! I began this part o' t' project by cuttin' t' aft bulkhead out o' a scrap piece o' 3/32" basswood. When t' ragged edges were cleaned up and it was sanded t' shape, shiver me timbers, I glued t' printed bulkhead cover over t' assembly then began t' process o' cuttin' out t' hole for t' motor tube and engine hook. This be another step where a rough cut be made via t' knife then cleaned up with sandpaper later on. Begad! T' internals consisted o' a length o' Semroc ST-8 tubing, an 18mm Estes engine hook, shiver me timbers, a CR-520 centerin' rin' that acts as an engine block, me bucko, and a CR-2050 that acts as a engine hook hold-down. Ahoy! This is assembled in t' traditional manner with t' added touch o' a 30" length o' Keelhaul®©™ shock cord glued in with t' engine block. Once this was together, ya bilge rat, I slid t' bulkhead into place around t' aft o' t' engine tube, me hearties, coated t' forward end o' t' tube with t' gel CA, and worked t' whole assembly into it's approximate place in t' paper shroud, ya bilge rat, while carefully keepin' t' engine hook oriented in t' correct position relative t' t' bulkhead. When I be sure that t' glue at t' front end had set securely, I glued t' aft bulkhead into position with regular white glue and build fillets around both t' place where bulkhead and shroud met as well as t' place where t' bulkhead and t' engine tube met. With t' body o' t' rocket complete, I turned me attention t' t' nose cone.

Centuri Vulcan Since I had built t' Vulcan usin' Semroc tubing, it stood t' reason that I'd need a Semroc nose cone t' fit t' tube. Begad! Well, blow me down! Luckily Carl had thrown one in when I ordered a couple o' each o' their body tubes a few months earlier, me bucko, ya bilge rat, and even luckier for me, ya bilge rat, it was pretty much an exact match for t' cone I needed. Begad! Since I needed a fairly hefty amount o' nose weight, I searched t' tool box for several short, heavy screws. I found two that fit t' perfectly and added an equally hefty screw eye for even more weight. Avast, me proud beauty! Ya scallywag! With little t' compare it to, ya bilge rat, this would have t' do. Finally, me bucko, after sealin' t' nose cone, paintin' it gloss black, and addin' a Semroc parachute along with two additional feet o' sewin' elastic shock cord, me hearties, I felt that t' Vulcan was ready t' fly.

Finishing:
Since everythin' be already printed on t' shroud, arrr, matey, finishin' it be a snap. Avast, me proud beauty! After printing, matey, I sprayed t' paper with a coat o' Krylon Acrylic Clear. Ahoy! T' only actual paintin' that needed t' be done was o' t' nose cone, me hearties, shiver me timbers, as I described in t' previous step. Arrr! That's me kind o' project!

Construction Rating: 5 out o' 5

Flight:
T' day I chose t' first fly t' Vulcan was a hot, matey, matey, sticky Sunday before Labor Day when everyone else in town be hangin' around on t' riverfront awaitin' t' fireworks. Well, blow me down! Anticipatin' some fireworks o' me own, I lugged several newly cloned rockets and some old favorites t' a local baseball complex where I had played Little League a few years earlier. Aye aye! (Okay, more like 35 years earlier, but who's counting?) One o' me fellow Quarkers and I had Launch Padrecently adopted it as an off-week-at-VOA flyin' field because o' it's fairly expansive landin' area and it's relatively centralized location t' our respective homes. Aye aye! We located our prep areas in t' shade o' two small trees near t' playground, me bucko, me bucko, which did wonders for our ability t' log over twenty flights betwixt us despite t' heat. Begad! Arrr! T' Vulcan was t' second o' me rockets on t' pad that day, and I conservatively chose a 1/2A6-2 for t' flight. (Okay, matey, arrr, maybe I was a little TOO conservative.) T' Vulcan cleared t' rod, arrr, but just barely. Avast! Avast, me bucko, me proud beauty! T' flight topped out well short o' 100 feet, shiver me timbers, but t' 2 second ejection charge easily deployed t' parachute before things could get tense. T' flight had been short from t' altitude standpoint, but t' fact that it be stable be what I be most interested in. Aye aye! I decided that baby steps were t' way t' go and for t' second flight decided on an A8-3. Avast! Unfortunately, flight #2 be a whole different experience compared t' flight #1. T' Vulcan began wobblin' badly as soon as it left t' rod, and t' wobble rapidly became more pronounced as t' engine continued t' burn. Things didn't get any better durin' t' coast phase as burnout had left t' rocket in a nose down position and t' hard dirt o' t' ball field was comin' up fast. Impact and ejection arrived far too close together, matey, arrr, but t' Vulcan survived with only a bent fin in t' way o' damage.

A week later I tried again, only with bigger engines. T' B6-4 flight wobbled somewhat but boosted t' a respectable height and recovered without damage. Ahoy! T' C6-5 flight wobbled a lot--to t' point that t' smoke trail had a distinct coil shape t' it but never reached t' point where it looked out o' control. (Well, nay COMPLETELY!) I'll try t' wedge some more nose weight into t' cone, but based on what some o' t' other fliers said that day, these flights were pretty much t' norm for this bird. Ya scallywag! I'll keep trying.

Flight Rating: 2 out o' 5

Summary:
PROs:

  • EASY build. Avast! It's possible t' build and fly t' Vulcan overnight.
  • Big attention getter at t' pads.
  • NO PAINTING! NO SEALING!! NO SANDING!!!

CONs:

  • Erratic flights (?)
  • Difficult t' determine t' thickness o' t' paper stock t' be used.

Overall Rating: 3 out o' 5

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