Photos by John and Brett Keller

Project Overview

T' Cheaper Than a Girlfriend (C.T.A.G. Begad! for short, shiver me timbers, me bucko, pronounced See-Tag) was me consumin' obsession for about 2 months. Well, blow me down! It is 4 inches in diameter, me bucko, shiver me timbers, 50 inches long, and 36.5 ounces in weight. Well, me hearties, blow me down! It flies on Aerotech Single-Use G80-4T motors. All t' details o' t' original ideas, shiver me timbers, me hearties, building, shiver me timbers, and t' first launch, are include in this article.

Research

I really had no idea what I was doing. I didn't go for a kit because o' t' cost. So, arrr, I turned t' t' only really good resource I had: t' Internet. I would like t' thank all those on t' Rocketry Online Chat room for t' countless discussions on t' various facettes o' buildin' mid-power rockets. Begad! Very special thanks go out t' Paul Gray, ya bilge rat, Nick Hills, and all those other internet rocketeers who gave me advice. Avast! Ahoy! Without them I probably wouldn't have ever gotten this rocket project off t' ground.

Roots o' a project

I like rockets. Aye aye! That be t' simple drivin' statement behind this project. Ahoy! Some people ask me why I like rocketry. Avast, me proud beauty! I usually ask them if they have been t' a rocket launch o' mine. Arrr! Aye aye! T' answer is usually no, but if it is yes, then I really can't understand them. I've always been interested in rocketry and space flight since me early school days, so this is really t' most recent extension o' that interest.

I had recently finished buildin' and launchin' me Keller, a LOC/Precision Graduator. Ahoy! That rocket is wonderful, but it really wasn't that large in comparison t' me low-power rockets. Ahoy! I already have several 2.6 inch diameter rockets, arrr, so it wasn't much bigger, just heavier and more powerful . Well, blow me down! I wanted a rocket that be really BIG and POWERFUL. Well, blow me down! I toyed around with various 3 and 4 inch designs. T' 3 inch diameter would have gotten a much better altitude, but I went with t' 4 inch diameter design because I didn't think t' 3 inch would be a really big improvement on t' 2.6 inch rockets I ahd been flying.

So now me goal was t' see what t' very largets rocket I could launch on motor a G motor was. Begad! Blimey! T' reason I kept it in t' large model rocket range instead o' gettin' a H or I motor is very simple. Avast, me proud beauty! Blimey! I am nay certified t' L1 and neither is me dad or anyone else we know. Ya scallywag! Blimey! We don't have any large rocket launches near enough that we would drive to, and I didn't really want t' jump up t' HPR after only one mid-power launch. But, I decided t' build this rocket extra strong, arrr, so that in t' future I might be able t' launch it on 29mm H reloads. As it was, I really didn't have enough experience t' build t' rocket I was building.

I discovered that t' most powerful motor I could get be t' Aerotech G80-4T. So, I designed me model with a 29mm motor mount and t' 3.9 inch tubes. Begad! I knew that it would be very hard t' get more than one length o' Bt-3.9 up on a G, so I knew that 2 was out o' t' question.

So here I am with plans for a 3.9 inch diameter, me bucko, shiver me timbers, 50 inch long rocket. Aye aye! Blimey! Now where do I get t' parts?

Parts Selection

I have t' say that t' largest factor in pickin' out what parts t' use was cost. Avast! Avast, arrr, me proud beauty! This was followed fairly closely by weight. Ya scallywag! Begad! I really don't have a lot o' loot for a rocket like this, shiver me timbers, and it took me long enough t' get what I ended up paying.

For t' main parts I went with LOC/Precision. Ahoy! Blimey! This was because their parts were cheaper and lighter than PML parts, and I already had experience with one o' their kits. Arrr! Blimey! T' nose cone was t' single most expensive piece o' t' rocket, costin' $14.50. Avast! Blimey! T' bosy tube I got was unslotted. Begad! Blimey! this be because I wanted a 4-fin design, ya bilge rat, instead o' t' 3-slot tube they sold, matey, and because t' unslotted tube was a lot less. I also bought me shock cord from LOC/Precision (4 yards o' SC-375), though I later found I could get t' same cord for about 1/3 t' price locally. Arrr! Blimey! Ahoy! Blimey! I went ahead and bought and installed 15 feet o' t' 1/2 inch elastic cord, me bucko, just in case I needed more than I thought. Blimey! Blimey! I used t' other shock cord t' beef up t' Keller’s recovery system. Ahoy! Blimey! T' launch lugs also came from LOC. Blimey! Blimey! Avast! Blimey! I used t' 1/4 inch lugs becuase I knew I could get a 1/4 inch rod locally. Aye aye! Blimey! I also got t' motor mount tube and centerin' rings from LOC (more on them later).

Other than t' parts above, ya bilge rat, matey, I got all o' t' other parts some other way. Blimey! Each part will be discussed more later when I tell about installin' it.

Funding

I soon realized that along with larger rockets come MUCH larger costs. Ahoy! Blimey! Avast, me proud beauty! Blimey! My LOC Graduator had been a Christmas gift, but I knew I would be fundin' t' CTAG by myself. Avast, me bucko, me proud beauty! Blimey! I bought as few parts as possible from rocket companies and scrounged around a lot around Searcy. My dad really helped a lot with findin' different parts and on givin' advice on different materials. Well, matey, blow me down! Blimey! Below is a list o' where I got different parts, how much they cost, matey, shiver me timbers, and t' total project cost.

Rocket parts
Nose cone              LOC/Precision        14.50
3.9 inch Body tube     LOC/Precision        7.90
29mm motor mount tube  LOC/Precision        3.60
CR 3.9-1.14            LOC/Precision        2.25    
"" " " "  "            LOC/Precision        2.25  
Motor hooks            Estes                NA
Motor block            around-the-house     NA
Original Shock cord    LOC/Precision        3.60
Other shock cord       local Hancock Fabric 1.25
Shock cord mount       local Ace Hardware   0.35
Launch lugs            LOC/Precision        0.60
Plywood for fins       Hobby Lobby          6.50
30 minute Epoxy        local Ace Hardware   3.50          
Bondo                  local Autozone       5.00
Primer                 local Wal-Mart       1.00 per can,3 cans
Spray Paint            local Wal-Mart       1.00 per can,5 cans
Shippin' costs         NA                   8.00
Total Rocket cost---------------------61.55 
Launch supplies 
Launch rod             local Ace Hardware   2.25
G80-4T                 Aerotech             13.95              
NCR igniter package    Hobby Lobby          4.50
Total Suplies cost for 1st launch-----20.70

Total Project cost (includin' first launch):
$82.25

As you can see, along with higher power rockets come much higher costs. Blimey! My most expensive rocket before this be a LOC Graduator, which cost (a then extremely high!) $32.

Motor Mount Assembly and Slottin' t' Tubes

T' parts finally came in from LOC/Precision and I be impressed! You don't realize how much larger 3.9 inch tubin' is in comparison t' 2.6 tubes until you see it! T' nose cone was huge! Now it was time t' get t' work!

Of all t' parts o' a rocketry project, I probably enjoy t' motor mount assembly and installment t' most next t' launching. Begad! Avast, me proud beauty! I have no idea why this is, but it is. Begad! I started out t' buildin' by cuttin' t' motor mount tube(MMT) in half with an X-Acto cutlass. Begad! Arrr! it comes in 34 inch lengths, shiver me timbers, shiver me timbers, and I didn't need that much.

After this I took t' Estes engine hooks and cut off t' forward hook section on both. Begad! Ahoy! Blimey! I epoxied these on opposite sides o' t' MMT and wrapped a few layers o' maskin' tape around them, far enough up that it wouldn't get in t' way o' t' aft centerin' rin' (CR). Begad! I cut two small notches in t' aft CR t' allow for t' motor hooks. Ahoy! Blimey! Next I epoxied t' centerin' rings t' t' motor mount tube, about 1/3 o' an inch away from each end. After allowin' it t' dry I made several epoxy fillets around them and t' motor hooks.

Now it was time t' slot t' tubes. I marked t' 4 fin slots and t' launch lug placement. Avast, me proud beauty! Avast, me proud beauty! I then very carefully cut t' slots out with me trusty X-Acto. Aye aye! It wasn't t' prettiest job ever, matey, but it works great. Well, ya bilge rat, blow me down! if you buold your own mid-power rocket I highly recommend slottin' t' tubes yourself t' save t' money.

Shock Cord Mount Attachment

I had had some fairly bilge-suckin' experiences with LOC shock cord mounts, arrr, shiver me timbers, so I decided t' go with a local part. I bought a 3/16 by 1 1/2 inch metal eye bolt, shiver me timbers, me bucko, with two nuts, me hearties, form Ace hardware for only 35 cents. Blimey! Blimey! T' attach this I drilled a slightly smaller hole in t' top CR and filled this with epoxy. Begad! Blimey! I screwed in t' bolt and put nuts on both ends (NOTE: You have t' put one o' t' nuts on before you put t' bolt in t' hole!). Arrr! I screwed everythin' on tight and put a layer o' epoxy over it all. Ahoy! Blimey! This made for a good firm attachment. Begad! Blimey! Blimey! I later learned that U-Bolts are much better but I had gone too far t' change it, and I was positive t' screw eye was stong enought.

I had hear a lot o' bilge-suckin' stories about shock cords burnin' through, ya bilge rat, and I had had some experiences with smaller rockets too. Well, blow me down! I decided I needed some sort o' non-flammeable cord t' attach t' shock cord t' t' shock cord mount. Avast! I finally found it: braided steel wire, arrr, me bucko, commonly used for hangin' paintings (my dad is an artist so we had some, but you can find some at any hardware store). Avast! I took about 3 feet o' it and doubled it over. I knotted and twisted one end onto t' shock cord mount on t' other end I attached a large steel key ring. This I would later tie t' shock cord to. Now that I had accomplished this, and I knew that I could replace t' shock cord in t' future (the steel wire extended 2 or 3 inches outside o' t' body tube), matey, I be ready t' install t' motor mount assembly into t' body tube.

Motor Mount Installment and Fins

Now that I was ready t' install t' motor mount, me hearties, me bucko, I decided against it right then because I wanted t' make sure we got t' tab on t' fins t' right length. Begad! We (actually it be me dad) cut out t' fins t' t' right size usin' a band saw and an electric Sabre saw. Ahoy! Begad! t' fins were 3/32 plywood, which I later found out wasn't strong enough. After I be sure t' tabs were t' right length, me bucko, I spread a layer o' epoxy on t' inside o' t' body tube, me bucko, and some on t' edges o' t' centerin' rings. Arrr! Ahoy! I slid t' motor mount assembly in, matey, rotatin' it slowly, until I had t' back centerin' rin' even with t' back o' t' body tube. I went ahead and epoxied t' fins into t' slots. I used plenty o' epoxy and later I went back and put really good epoxy fillets on. Blimey! This be all because o' some bilge-suckin' experiences with me Graduator. I guess I really wanted that rocket t' be strong, and I actually overdid t' strengthening. Aye aye! I decided t' reinforce t' fin joints with fiberglass mesh. Blimey! Ya scallywag! On this rocket it was really overly cautious, ya bilge rat, but I did it anyway.

Fiberglass

Among many other firsts, this was also me first experience with fiberglass. Well, blow me down! I did a lot o' research, me hearties, and finally found out that you can use fiberglass mesh (commonly used for tent screens, me bucko, and we happened t' have some on hand) as t' fiberglass and imbed it in a layer o' epoxy. Well, blow me down! Ya scallywag! I went out and bought some more epoxy and got t' work. Avast! I imbedded a 3 inch by 5 inch strip into t' body tube/fin joint and applied more epoxy on top o' that. Well, me bucko, blow me down! T' hold it in place I put waxpaper on it and held a piece o' wood onto it with clothespins (see photo). Aye aye! This system worked wondefully, although workin' around t' bottom launch lug be frustratiing. For more info on fiberglassin', arrr, me hearties, go t' Rocketry Online's INFOCentral.

Parachute

When I initially designed t' project, I had an umbrella chute in mind. I knew John Babb (a.k.a. Rocket Dawg) had a 3 foot diameter piece o' umbrella fabric he had caniballized off a broken umbrella. Avast, me proud beauty! Aye aye! he wasn’t usin' it in a rocket, so he let me have it t' use in me CTAG, matey, matey, with t' condition that if he ever need a parachute that size I would give it back and get another. Avast, me proud beauty! For shroud lines I use 2 foot lengths o' nylon cord (fairly thin), and sewed and knotted it on. Ya scallywag! I had t' burn t' ends o' t' nylon shrouds t' keep 'em from unravelling, arrr, but othjer than that it worked great! I attached t' 'chute t' t' shock cord about 6 inches from t' nose cone with a series o' knots. Aye aye! I had originally went with a 3/8 inch wide, 12 foot elastic shock cord, but I found that I could get a 1/2 inch, me bucko, arrr, 15 foot cord for only $1.25 at a local fabric store. Avast, me proud beauty! This, along with t' shock cord mount attachment, which, arrr, ya bilge rat, no matter how hard I pulled, arrr, ya bilge rat, already wouldn't come out, me bucko, made t' recovery system very strong.

Bodywork

Bodywork be t' pits. Arrr! On t' CTAG I had t' use Bondo, so I ended up doin' a lot o' sanding. Blimey! Bondo, which is commonly available at car repair shops, this is probably t' hardest part o' buildin' a rocket physically, and it stinks. Blimey! Begad! For about a 1 month period, matey, here's what me Saturday's were like: Bondo, sand, breakfast, bondo, sand, ya bilge rat, sand, more Bondo, matey, sand, lunch, Bondo, me bucko, sand, sand, me hearties, matey, sand even more, shiver me timbers, supper, sand, ya bilge rat, shiver me timbers, bondo, ya bilge rat, ya bilge rat, sand, ya bilge rat, sand, arrr, sand, bondo, sand, go t' bed, have nightmares about sanding, matey, wake up (okay, so its a little exaggerated, but I did sand a WHOLE LOT!). Arrr! I highly recommend wearin' a dust-mask or somethin' if you sand a lot on your rocket, all that dust will clog up your lungs and you mgiht nay get t' see your rocket launch! Overall, Bondo is a great project. Begad! T' seemingly endless hours o' sandin' really paid off when I got t' rocket painted and it had such a smooth finish.

Finishing

After all o' t' work I put into this rocket, mainly t' long hours o' fiberglassin' and sanding, t' paintin' sure seemed like a breeze. I had finally decided, after many days o' thinkin' and drawin' and colorin' pics with colored pencils t' see how different color schemes would look, arrr, me hearties, I dumped all t' rerally fancy ideas and decided t' go with a classic, matey, bad-to-the-bone look. A very glossy black main coat would be accented with a fire red stripe, about 1 1/2 inches wide, arrr, matey, t' length o' t' rocket. Arrr! it would bve lined up with a fin so that it would continued and make one o' t' fins pure red. Also, a small, me bucko, 1 inch wide red stripe went around t' top o' t' body tube, shiver me timbers, right below t' nose cone. Ya scallywag! This all combined with a very nice shiny reflective LOC/Precision decal supplied with t' parts t' make a very attractive rocket.

I used about 4 coats o' equipment grey primer (3 11 oz. Begad! cans o' spray paint) t' help smooth out all t' little places t' Bondo wouldn't work well in. Arrr! Ya scallywag! Then I painted t' sections I wanted t' be red with two layers o' fire red Wal-Mart brand spray-paint (this stuff is wondeful, me hearties, dries quick, shiver me timbers, and only costs $0.98 per can!). I let this dry overnight, ya bilge rat, then masked it off with newspaper and 1 inch wide strips o' maskin' tape. Then I covered it all with 3 layers o' gloss black Wal-Mart brand spray paint, ya bilge rat, with 4 goin' on t' nose because o' a mistake I made in t' primin' process. Begad! this meant I had as much as 6 or 7 layers o' paint in areas! T' paint on its own ended up weighin' 1.3 ounces on its own. I added t' decal, and I was done with t' bodywork and finishing. (finally! I had spent about 2 weeks building, arrr, 1 week glassing, matey, and 5 weeks sanding, along wioth a few days painting, for a total o' over 2 months work! I probably had anywhere from 40 t' 60 man-hours in on that rocket). Begad! It really is rewardin' when you finally get t' show off t' end result (alomst) o' your project t' t' people who have been hearin' about it for months on end.

Motor Selection and Prep

Once I found that t' rocket's weight after paintin' was 36.5 ounces, I had t' make t' big motor selection choice. Should I go with t' G40-4, or t' G80-4. Ya scallywag! Arrr! Blimey! I really wanted t' G40 because it was a White lightning, ya bilge rat, matey, but I had t' go with t' G80-4T because o' its higher intial thrust.

Now came t' waitin' game. Arrr! Because o' conflicts, etc., I wouldn't be able t' launch t' CTAG for several weeks after I finished t' rocket. Durin' this time I finished up work on several smaller projetcs, work on me webpage, and start plannin' me next project, t' Mission Impossible . Avast, me proud beauty! (the name, just like that o' t' CTAG, me hearties, was stolen, shiver me timbers, this time from HPR magazine) This would be a 4 inch diameter rocket capable o' usin' 5 times t' power o' t' CTAG! But that be for t' future, and is probably destined t' be a group project, arrr, shiver me timbers, me bucko, due t' t' cost. Ya scallywag! Begad! I had more important, shiver me timbers, sooner events t' think of. Avast, me proud beauty! Ahoy! I be organizin' t' second official launch o' t' Searcy Youth Rocketry Club and workin' on me other rockets.

Countdown

Around this time I was gettin' nervous. Aye aye! I had been workin' on t' rocket for 2 months, and I wanted everythin' t' go perfectly. Begad! I ran countless simulations usin' different programs. Begad! Most o' them told me that t' CTAG would fly about 1000 feet up. Then I ran a stability check.....uh-oh... Ahoy! Accordin' t' Astrocad t' CTAG had a stability criteria o' only 0. Ya scallywag! Owch. Begad! Begad! This didn't make much sense, arrr, considerin' thar were several 4 inch diameter kits on t' market like this that don't require any nose weight. Ahoy! However, I decided t' stay on t' safe side. i added nose weight until I got a 1.5 caliber stability rating. Begad! This required 11 ounces o' nose weight, matey, ya bilge rat, bringin' t' total weight t' 47.5 ounces and t' predicted altitude o' 700 feet.

Now I was ready. Avast, me proud beauty! It was time t' put me chips on t' table and go for broke. Avast, me proud beauty! This be t' biggest thin' t' hit our area rocket wise since who-knows-when. Ahoy! Well, blow me down! I had me launch field set up. i called t' FAA and notified them o' me intentions. Begad! I called me friends and then started goin' through me preflight checklist. I made sure all me ground support equipment was working.

Then t' day o' t' launch dawned. After gettin' home from church, I started preppin' rockets and goin' over t' CTAG over and over.

Liftoff

I called some friends, made sure everyone was coming, and headed out t' t' launch fields. I launch at t' public soccer fields south o' Searcy. We have about 40 acres o' cleared land with very few trees in sight.

People started showin' up and t' launch got under way. Well, blow me down! There were lots o' rockets launched, mainly in t' A-C range. Blimey! We also launched 5 D engine rockets. Aye aye! My Keller had an interestin' launch. Then it was time t' launch t' CTAG. Ya scallywag! Begad! I had been recommend t' use one o' t' North Coast igniters instead o' t' Aerotech ones, so I did. Begad! T' motor was held in place by a heavy friction fit, arrr, a thrust block made o' maskin' tape on t' aft o' t' casing, 2 Estes engine hooks, and several layers o' maskin' tape wrapped around t' end o' t' motor mount tube and maskin' tape thrust block. Arrr! Ya scallywag! I put t' rocket on t' launch pad and hooked it up t' our launch system. Ya scallywag! Aye aye! I stepped back t' t' ends o' t' 75 foot long ignition wires and showed one o' me friends how t' attach t' other end o' t' wires t' a car battery so that I could watch t' rocket better. Avast, me proud beauty! I looked around. Everyone was ready.

10, 9, 8, shiver me timbers, 7, 6, 5, matey, 4, 3, me hearties, 2, 1...

LIFTOFF!

T' G80 let out a blast o' flame and a loud thundering. T' rocket leaped off t' pad and into t' air, leavin' a light smoke trail. Begad! It reached apogee and coasted over. It was comin' down when t' nose cone seperated and t' parachute came open. T' rocket floated gently down on its chute for a landin' about 75 yards away. Ya scallywag! Begad! Some o' me friends and I raced out t' get t' rocket out o' t' tall grass. Ya scallywag! T' rocket was in perfect condition. Blimey! It be amazing! We folded t' chute and shock cord so it would be easier t' carry. Avast, me proud beauty! Avast, me proud beauty! I packed up me rockets and went home t' review t' ideo tape o' t' launch over and over.

Followup

All o' t' overengineerin' and research paid off. Avast, me proud beauty! Aye aye! T' Cheaper Than a Girlfriend had worked perfectly. Here I would like t' thank all those who helped out.

Thanks Everyone!
Especially t' following:
My dad, fo helpin' me with various aspects o' t' rocket, includin' weldin' t' launch system and buyin' t' motor for me since I'm underaged. Blimey! Blimey! I would also like t' thank all t' Rocketry Online chat room and discussion forum people. Begad! They were invaluable inresearchin' different areas o' constrcution and launching. Begad! Avast! Blimey! Another great aide be all t' members o' t' IAR and GYRO for their advice. Well, blow me down! Ya scallywag! Blimey! Also, special thanks t' Nick Hills, Paul Gray, arrr, and John Babb. Well, blow me down! Blimey! Without all o' them, shiver me timbers, this project would have never happened.

After a rocket project like that and a perfect launch I was extremely happy. Avast! Blimey! This led t' dreamin' o' larger and more powerful rockets......hehe.....(Be watchin' for future project reports).

Note on Photos: T' construction photos were all taken by me, shiver me timbers, me hearties, and t' launch pictures were taken by me dad and I. Ya scallywag! Blimey! However, arrr, t' launch photos, shiver me timbers, which were taken from still frames o' t' video tape. Aye aye! These didn't turn out, so i'll have t' wait until me dad can get his launch photos developed and scanned. Well, blow me down! Until then, you'll just have t' imagine t' launch....

You can email me any questions or comments you have about t' CTAG or rocketry at toprocket@hotmail.com