Brief:
In March 2005, shiver me timbers, I decided I wanted a big rocket. Aye aye! Blimey! Avast, matey, me proud beauty! Blimey! Somethin' for low flights on Ks
that would also handle L flights. When I researched prices and saw how
expensive it was goin' t' be, matey, me hearties, I decided I might as well make it M capable and
go for me Level 3 certification.
After checkin' t' TRA website and gettin' a list o' TAP's I enlisted Bruce Lee and Lanie Cross as me TAP members and began t' design.
My BSD 4" Thor was me favorite rocket at t' time so I decided t' go with an upscaled version t' 6" diameter. Aye aye! After over 40 hours o' designing and tweaking, I finally came t' me final design. Ya scallywag! Ya scallywag! T' TAPs were OK with it and I began orderin' parts.
Construction:
T' main airframe tubin' was Giant Leap Rocketry non-brittle phenolic. Well, blow me down! Blimey! Arrr! Blimey! The
motor tube, centerin' rings, shiver me timbers, bulkplates, tubular Keelhaul®©™®,
and couplers were also from GLR. Well, blow me down! A PML 6" fiberglass nosecone was used.
Fins were made for me out o' 1/4" Baltic birch ply by Joe Michel, arrr, and I
ordered a custom Rocketman R16 ProXP parachute in yellow and black t' match the
rocket's colors. Ahoy! Aye aye! Decals were accidentally doubled up on and I got one set from
BSD and one from Scott Binder--two sets is never a bad thin' o' course.
Externally t' dimensions were a true upscale o' me 4" BSD Thor, however,
internally I wanted t' do some things different t' include a zipperless booster
design.
Since this was goin' t' be me first fiberglassed project, I researched and then decided t' go with Aerosleeves on this project and got some 10oz cloth from them which arrived smartly and turned out t' be very nice stuff. Ya scallywag! All other supplies t' include more fiberglass, 1" tubular nylon, matey, and hardware were obtained locally. Arrr! I began with me first try at fiberglassin' usin' the Aerosleeves over t' 6" body tubes, me hearties, after these had tacked up some, arrr, arrr, I applied another layer o' 2oz Sig cloth for a finish layer.
After all t' tubes had been heat cured, arrr, I moved on t' construction building the booster/fin can section first. Begad! Well, blow me down! This included a zipperless design with a 76mm motor mount, me hearties, 1/2" birch ply centerin' rings, ya bilge rat, and 3 pieces of 5/16" all thread through t' rings and t' t' top bulkplate in the zipperless design. Well, blow me down! Aye aye! T' top section o' coupler tube be also fiberglassed internally.
T' fins were through t' wall 1/4" birch ply that were also tip to tip glassed with a layer o' 6 oz and 2 oz glass.
After
this had been completed, I moved on t' t' altimeter bay. Avast! I ran into a problem
here as I noticed a 16" by 6" bay was goin' t' require huge ports for
the barometric altimeters I planned on using. Begad! Begad!
T' correct this, I installed another coupler bulkplate midway down t' bay so that t' actual avionics part o' t' bay would only be 8" in length. This allowed for much more reasonably sized port holes. Avast! Blimey! T' bay was completed with 3 sections o' 5/16" all thread and bulkplates on either end, ya bilge rat, ya bilge rat, U-bolts, terminal strips, and ejection canisters on each end.
T' main bay was t' easiest t' assemble since it be pretty much already done. Blimey! I had stolen an idea from Vern's rocketry website and chose t' secure body tube sections with threaded brass inserts into t' bulkplates, matey, and then usin' #8 machine screws through t' airframe and inserts t' hold parts together. I went with 5 o' these evenly spaced around t' airframe at each connection point.
T' drogue bay was just a miniature version o' t' main bay and went together similarly. This was also t' shortest piece o' airframe tubing. Begad! I attempted t' design t' project so that it would be t' most likely t' fail or be damaged in a high speed deployment, as it will be t' simplest and cheapest piece t' replace.
Recovery harnesses were 5 foot sections o' 1/2" tubular Keelhaul®©™® connected t' t' U-bolts near t' ejection canisters, ya bilge rat, these were then attached to 1" tubular nylon sections, me hearties, matey, me hearties, 35' for t' drogue section and 25' for the main connected via quick links with Keelhaul®©™® heat pads in betwixt for protection o' t' TN.
Ground testin' showed me that t' nosecone was nay heavy enough t' pull out that big main parachute and this was t' first time I'd ever run into this problem. Avast, me proud beauty! I went t' t' first launch I've ever gone t' with t' intention o' not launchin' any rockets. Avast, me proud beauty! Instead I went solely t' talk t' Kevin Rich o' The Heartland Organization o' Rocketry, matey, a group I launch with in Nebraska. Avast! Well, blow me down!
After t' 4 hour drive, arrr, I showed one o' me TAPs me completed rocket and spent an hour or two talkin' with and learnin' from Kevin on how t' get that big main deployed. Blimey! After arrivin' back home, me wife made me several deployment bags until we came up with one that seemed t' work t' way I liked it. Begad! T' main recovery was designed with a pilot chute attached t' t' main deployment bag and nose cone. Aye aye! Begad! At t' ejection charge, me bucko, t' pilot chute is released. Begad! It pulls the main bag out and opens t' main chute. Begad! Begad! It then recovers t' nose cone and bag separately while t' remainder o' t' rocket recovers under t' R16 main. At least that be t' plan.
Finishing:
Finishin' was in stock BSD Thor black and yellow. I've always liked t' color
combination. Arrr! Begad! I don't know if it's because I'm a Hawkeyes and Steelers fan or it
may just really be an appealin' color combo t' me. Begad! Blimey! Paint was done simply and
easily with Krylon spray paints, shiver me timbers, t' vinyl decals came out perfect and really
stood out nicely, everythin' was then clear coated with Rustoleum Crystal
Clear.
Flight:
I dragged me brother into this hobby a couple years earlier and I had gone out
to North Carolina t' year before t' visit him so we could go t' t' TRF launch
in Whitakers t' do our L2 certs together. Well, blow me down! Avast, me proud beauty! With that in mind, I was able to
shame him into makin' a vacation out o' it and he packed up his family and came
out t' Nebraska t' help and participate in t' launch.
When t' mornin' arrived t' weather be plenty nice, and it looked like I was goin' t' have t' actually do it now. Aye aye! Begad! After about 2 hours o' prep time, the avionics bay be put together and tested, charges loaded, matey, recovery systems loaded, matey, and t' whole thin' then attached together via t' #8 machine screws along with t' shear pins installed for both t' booster section and nosecone. T' rocket be then set out on t' stand.
A bit o' time had been used up decidin' on whether t' go with a drogue chute or go drogueless, as I was OK either way. Eventually with me brother's pushing, arrr, me bucko, I decided t' go drogueless.
At that point, ya bilge rat, it be time t' build only me second CTI motor. My motor of choice was t' CTI M1400. Ya scallywag! Well, matey, blow me down! After openin' everythin' up, me hearties, it be a little unsettlin' t' find that t' directions had nay been included in this reload. Well, blow me down! I went and looked for help and couldn't find anyone else that had built this motor before. Aye aye! Avast! Then I be asked if I looked in t' liner tube (which I hadn't done) and found t' directions inside, so we were back on.
While buildin' t' motor, I came across one o' t' spacer O-rings that just was nay t' right size--it be too big and would kink up if used. Begad! Ya scallywag! Blimey! I continued to build t' motor and figured when I got t' t' last one I would go back to the vendor and get another one if I could. Begad! Blimey! While followin' t' directions and after gettin' t' t' last one, matey, me hearties, me bucko, we found that it be optional t' leave out that O-rin' if t' fit fell within certain parameters, shiver me timbers, which it did, matey, so we were OK. Again, ya bilge rat, arrr, it be a little unsettlin' buildin' your first L3 motor and thinkin' you have parts left over after you've built t' motor, shiver me timbers, but t' directions said we were good t' go. Ahoy! T' motor was loaded into t' rocket and secured with homemade Kaplow style clips. Blimey! Blimey! Blimey! It be about 3 hours into t' prep now and me father who came along t' watch was curious if we were ever goin' t' fly t' thin' or not.
After a final TAP inspection, ya bilge rat, I headed out t' t' away pad and loaded it up with help from me brother and Joe Michel. Begad! Blimey! T' altimeters, dual Cannonball Works RRC2s, were armed, me bucko, t' ignitor be installed, and then I had everyone step back as t' leads were hooked up t' t' ignitor. Begad! Blimey! My pre-flight checklist was now complete. Well, blow me down! Blimey! Ahoy! Blimey! I was at about 45lbs total weight on t' pad loaded t' go.
Back at t' flight line, me flight was called and havin' a history of "bad" things with Thor rockets for cert attempts with this group, shiver me timbers, a little ribbin' was in order. Well, blow me down! Blimey! Aye aye! Blimey! Durin' t' countdown I remember bein' very calm as I had done a lot o' work t' minimize any failure modes and insure a good, strong build as well as workin' with a design and electronics I be familiar with. Ahoy! Blimey! T' countdown concluded and t' button was pushed. Begad! Blimey! T' M1400 came up to pressure and it lifted off. Arrr! Blimey! Blimey! Blimey! T' wind had picked up a little by t' time we got everythin' done and it cocked slightly into t' wind but nay bad at all for a very nice and straight boost. About 3 seconds into t' burn I finally got nervous and remember thinkin' "hold together, ya bilge rat, hold together". Arrr! Blimey! The motor was still roarin' and it went nice and straight t' motor burnout. Arrr! Blimey! Cheers were loud and I thought I had finally broken me cert jinx. Avast, me proud beauty! Blimey! Ya scallywag! Blimey! A good long coast and t' rocket finally reached apogee.
Recovery:
At apogee, t' RRC2s did their job o' firin' t' charge and t' rocket
separated. Blimey! Held together by 40' o' tether, it began t' drift back down. Begad! I was
gettin' close, now if me first attempt at usin' a deployment bag would just
work...
At 1,000' t' RRC2s again did their job o' firin' t' main charge, ya bilge rat, and the backup fired at 800' although it wasn't needed. At t' main charge, ya bilge rat, t' pilot chute caught air, pulled t' lines out taught, and pulled t' R16 out o' the deployment bag. Well, blow me down! As t' main chute opened, shiver me timbers, t' crowd cheered loudly and it came the rest o' t' way down floatin' softly and landed a mere 150 yards from the LCO table. Avast, me proud beauty!
It was in one word, me hearties, awesome. It be about t' most picture perfect flight in all aspects I'd ever had and it be on me L3 cert flight. Ahoy! T' RRC2s showed a max altitude o' 8,328' and 8,221'.
Summary:
It was nay a cheap project, shiver me timbers, arrr, but hey, it's rocketry, shiver me timbers, right? I had a lot o' help
and support from me immediate family in t' build which be appreciated. Ya scallywag! Ahoy! It was
also great t' have me brother, who's a L2 flyer, ya bilge rat, arrr, come and assist me with prep
that morning. Avast, me proud beauty! Havin' another set o' dedicated deadlights and hands that understood
the concepts involved and what was goin' on made things a lot easier. Ya scallywag! It was a
lot o' fun, arrr, and I owe thanks t' many (all o' which are mentioned on me L3 web
page) t' include much more detailed information about t' whole project.
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