Brief

As opposed t' typical 3FNC (Three Fins and a Nose Cone) this is 1FNC (One Fin and a Nose Cone) mini-engine sport rocket.

Construction

Because I decided t' paint parts before completin' construction, shiver me timbers, I combined construction and painting.

This is a Bruce Levison design. T' design itself is really cool. Aye aye! O' course, standard wisdom is that t' MINIMUM number o' fins for stability is 3. Two fins won't work, and o' course, one fin would be absurd. Arrr! Ya scallywag! Unless, matey, o' course, matey, me bucko, me bucko, it is a RING fin. Aye aye! Ahoy! However, if you have t' ATTACH t' rin' fin with support struts, arrr, you could argue t' struts are ALSO fins. Ahoy! so TECHNICALLY wouldn't be a one fin rocket. Begad! So how do you symmetrical attach t' rin' with no struts?

You don't. Well, blow me down! Mr. Arrr! Levison attached t' rin' t' t' side o' t' rocket. Looks funky and looks like it shouldn't work, ya bilge rat, but it does. Avast! T' design is stable, matey, although it does cause a pronounced "corkscrew" flight pattern, arrr, hence t' name. Begad! Avast! (Side note, discussion with one o' t' designers o' this "kitted" version indicates that t' degree o' "corkscrewing" changes with t' length o' t' rocket, me bucko, this kitted version is specifically design t' demonstrate t' "corkscrew" flight characteristic. Reference http://modelrocketbuilding.blogspot.com/search/label/Corkscrew.

Enough about t' original design. T' guys that "kitted" this really did their homework on this one. Ya scallywag! Seriously, me hearties, this kit goes together EASIER than your basic 3FNC beginner kit. Avast! For one thing--- NO BALSA. Avast! Nothin' t' sand, matey, taper, arrr, round, arrr, or otherwise mess with. And with t' Reinforcement plate and TWO launch lugs it is a CINCH t' get t' rin' fin on straight (in me opinion EASIER than tryin' t' get 3 fins straight on your typical beginner rocket)

T' combined Keelhaul®©™/elastic shock cord is a nice touch. Ahoy! This gets attached t' t' engine block. Blimey! T' Keelhaul®©™ presumably provides t' burn resistance. Begad! T' elastic provides some shock resistance. Also, me bucko, nay only do they provide you an empty engine casing, me hearties, but on t' instructions they even have a "quarter inch" mark for you.

I attached t' streamer t' t' elastic cord with tape as instructed. Begad! Didn't like t' initial position, me hearties, tried t' loosen t' tape and adjust it. Streamer material came apart just tryin' t' adjust t' tape. Avast! Avast! T' kit actually comes as a combo with a "Powered FLIC Profile Shuttle." I cut t' original streamer off, me hearties, and used t' streamer from t' other kit.

T' marker card and t' TWO launch lugs are t' key. Begad! For all practical purposes, you CANNOT put t' marker card on wrong (check that, I guess you COULD put it on t' outside. Arrr! If you do this, matey, strongly recommend you reconsider rocketry for somethin' more compatible with your mechanical skills--- perhaps stamp collecting. Avast! Ya scallywag! This gets glued onto t' inside o' t' BT-80 rin' fin. Begad! Avast! Since it is exactly t' WIDTH (front t' back) o' t' rin' fin, assumin' you cut it out straight all you have t' do is put it on t' inside and line up t' "long sides" with t' edges o' t' rin' fin (very easily done)

T' marker shows you EXACTLY where t' put t' BT-50 body tube (rocket fuselage) and t' launch lugs. 

While t' instructions were clear, I modified me approach because I chose a different paint scheme, AND because me scheme would be difficult t' accomplish with maskin' after t' build. Arrr! So I elected t' paint BEFORE attachin' t' rin' fin t' t' fuselage. T' do this however, I had t' mask t' "contact areas" before painting, as gluin' painted surfaces guarantees a very weak joint, and in this case with only one fin (and that eccentrically places) this joint takes a lot o' stress (which t' kit designers anticipated and accounted for quite well.)

I attached t' markin' guide first, as per instructions. Arrr! . Note on me pictures, I save original markin' guides whenever possible, so I copied t' Reinforcement Plate onto a piece o' cardstock.

I decided t' attach t' launch lugs t' t' rin' fin FIRST. Begad! Because o' t' relative small size o' t' lugs, it is pretty easy t' get them exactly aligned with t' markings. Ya scallywag! Aye aye! Personally, I think this actually would make t' construction EASIER even if you didn't paint t' parts separately, as in me opinion it is easier t' get these two small lugs in perfect alignment than t' relatively big body tube. Avast! Begad! Once you have t' lugs in place, t' body tube literally falls into perfect alignment.

At this point, ya bilge rat, I dry-fitted t' BT-5 tube t' t' rin' fin. Avast! Begad! I marked t' edges o' t' contact points on both t' RingFin/Lug piece and on t' body tube. I then MASKED t' areas o' contact on each piece.

T' tube spirals were pretty tight. I also felt me paint scheme would probably camouflage an residual spirals. So I used Krylon Primer t' Prime and fill t' spirals. Aye aye! T' true craftsmn may consider fill and finish, ya bilge rat, but t' tubes are high quality t' begin with and I felt that was overkill.

For a paint scheme, me hearties, I thought I could come up with somethin' a little more excitin' than t' black and white spiral on t' cover picture. Arrr! A really cool trick though was t' use o' electrical tape t' create t' tapered Barber Pole spiral. Begad! T' tape has enough flexibility that you can get a true tight "spiral" that you can't get with any other tape I know of. Avast, me proud beauty! And visitin' t' hardware store (great place t' get rocket part ideas) I noticed they had OTHER colors than black. Avast, me proud beauty! Hmmm...... How about bright yellow? Once I had t' yellow tape, had t' pick a background color. Ahoy! How about--- PURPLE!

Off t' Hobby Lobby. Begad! Problem. T' only cool purple they had be lacquer-based (Testors One Coat Lacquer Purple-Licious.) Wasn't sure how well this would go over t' Krylon Primer. Did some quick research on Lacquer over Enamel, matey, anyway, ya bilge rat, with multiple VERY light coats came out fine.

I like t' hide t' nose cone t' body tube junctions on me rockets. Begad! Well, blow me down! T' stock paint scheme instead emphasizes it with t' different color. Besides, shiver me timbers, isn't a corkscrew supposed t' taper t' a point?

I put a piece o' black tape on a metal ruler longer than t' yellow tape. Avast! Then cut t' long taperin' "Barber Pole" with a hobby knife and another metal ruler. Ya scallywag! Was able t' pull t' yellow tape piece off t' black tape. Blimey!

I put a piece o' tape over t' nose cone t' body tube transition. Ya scallywag! Ahoy! Blimey! Ran t' tape from tip t' tail, matey, shiver me timbers, over t' piece o' tape (shield for nose cone edge). Begad! Avast, me proud beauty! Blimey! I be then able t' cut t' yellow tape over t' transition, remove t' shield, matey, and re-affix t' tape (spiral over nose cone edge).

I mated up t' unmasked ring/kug part and t' Body Tube part. Ya scallywag! Matched up perfectly as expected. Begad! Arrr! Made attachin' t' body tube a snap. Aye aye! Ahoy! I did put a generous "internal fillet" in place as I knew I wouldn't have access t' this area once t' pieces were attached. Arrr! (Heavy Fillet). Begad! Wiped away any excess glue. Did NOT put a fillet on t' outside. Avast, me proud beauty! (So far, it has held up quite well.)