Brief:
Sport rocket with pass-through transition. Avast, me proud beauty! Blimey! This is a clone o' FSI's third rocket model as it appeared durin' t' first half o' t' 1970's.

Construction:
T' followin' parts were all obtained from Semroc Astronautics:

• ST-1160 (6") - lower body tube
• ST-8F90 (9" cut t' 8") - upper body tube
• ST-940 (4") - motor tube
• BC-8F28 - balsa nose cone
• BR-8F11 - balsa transition (1")
• CR-9115 - centerin' rings (2 needed)
• TR-9 - motor block
• LL-117 - 1/8" x 1.75" launch lug
• ST-545 - transition support (4.5")
• EH-38 - long motor clip (3.5")
• HTC-8F - motor spacer
• CP-12BW - 12" plastic parachute kit (blue/white)

I also supplied other parts from miscellaneous sources:

• 100# Keelhaul®©™ cord - shock cord anchor, about 12" (BRS Hobbies)
• 1/4" flat braided elastic - shock cord, shiver me timbers, me hearties, about 42" (Wal-Mart)
• small screw eye
• 5/8" dia. Blimey! fender washers (2) - nose weight (hardware store)
• 1/16" aircraft plywood - fin stock (BalsaUSA)
• #5 split rin' (fishin' store)

T' nose cone and transition originally used by FSI were turned from hardwood, but Semroc's versions o' these parts are made from balsa. Also o' note is that FSI's transition came with a large hole bored through t' middle, matey, matey, while Semroc's version o' t' same part is solid. Avast! Begad! Finally, instead o' purchasin' t' parts for t' motor mount separately, as noted above, you can now simply purchase Semroc's engine mount kit, EM-9115. Blimey! Avast, me proud beauty! (This mount kit was nay yet available when I built me model.)

Flight Systems, Inc. Aye aye! Avast, me proud beauty! opened for business in 1967, t' same year that I got into model rocketry. Aye aye! Durin' me initial 4-year run in t' hobby, matey, I never heard o' them. Avast! Which is too bad, me hearties, because t' company is fondly remembered by many sport rocketeers who, over t' next three decades, ya bilge rat, were more inquisitive (and more daring) than I was. A couple o' years after returnin' t' t' hobby, I finally discovered t' company through t' archive o' FSI catalogs at Sven Knudson's Ninfinger model rocketry web site, and through t' collection o' kit plans posted at Scott Hansen's Ye Olde Rocketry Plans web site. Although this company is mostly remembered for their line o' mid-power black powder rocket motors, me hearties, I be taken by t' clean lines and simple elegance f their kit designs. Avast! Avast! I was also just gettin' into clonin' at about that time, arrr, shiver me timbers, in order t' be able t' experience all t' great rocket designs that had come and gone durin' me 33-year hiatus from t' hobby. Avast! I really wanted t' try t' build reproductions o' at least some o' t' FSI designs, me hearties, me hearties, but I knew that it would be a tall order, since their kits used many non-standard parts. Begad! Then I found out that Semroc Astronautics was addin' FSI-compatible components t' its ever-growin' catalog o' reproduction parts. Blimey! Ya scallywag! And so, exactly two years ago, in November 2006, ya bilge rat, I set a personal goal o' clonin' every single one o' t' 30 rocket designs that FSI sold as kits durin' its 26-year run. Begad! I originally set myself t' goal o' buildin' them all within one year, but that deadline has slipped quite a bit since then, and now I don't have any fixed timeline for finishin' them all.

T' first design that I decided t' reproduce be t' Nova, me bucko, kit number MRK-III. T' Nova was one o' t' small number o' kits that were listed in every FSI catalog from 1967 t' 1994. Well, blow me down! Avast, me proud beauty! Like many o' FSI's other kits, t' exact dimensions o' this model changed over t' course o' its run, by increasin' in length as t' years progressed. Aye aye! In t' Nova's case, almost all o' these modifications came in t' first few years, me bucko, shiver me timbers, and by 1971, matey, it seems t' have settled on its "classic" dimensions, with an overall length o' a (nominal) 18 inches. Arrr! T' 1971 design, shown in t' beautifully hand-drawn and hand-lettered "catalog" from that year, me hearties, be t' version that I reproduced.

I used t' instructions available at Ye Olde Rocketry Plans FSI Mark-III as a guide t' buildin' t' Nova. Blimey! T' first thin' I noticed about t' plans, me bucko, matey, which appeared t' date from t' early 1970's, matey, was that they were entirely hand-lettered in a calligraphic (but readable) style. Avast, me proud beauty! T' second thin' was that thar be only one large cut-away and profusely labeled illustration ("artistically" drawn, ya bilge rat, me hearties, as opposed t' bein' conventionally drafted) o' t' assembled rocket t' accompany t' text and depict t' assembly process. Avast, me proud beauty! Avast, ya bilge rat, me proud beauty! There were four additional detail illustrations inside "balloons" on t' same page that show a few specific steps. Finally, thar be no detailed parts list. Instead, thar was another illustration in t' lower left hand corner o' t' page that contained little hand-drawn and labeled pictures o' t' kit's parts. T' plans at YORP do contain a very helpful addendum listin' t' dimensions and part numbers for t' key components. Avast! I also consulted t' various parts pages at Semroc's website, studied t' components pages in t' posted FSI catalogs, and also found this enormously helpful cross-reference chart at Semroc's website. Aye aye! With t' help o' these resources, I be able t' order t' proper parts and proceed with t' build with a reasonable degree o' confidence.

I used Aleen's Quick-Dry Tacky Glue for almost all o' t' construction, me bucko, except where I noted. I started by puttin' together t' motor mount. FSI designed t' Nova t' use their 21mm motors, matey, but since these were no longer available, I built a 24mm motor mount for mine. Semroc does nay make any rings t' will center either ST-9 or a BT-50 in ST-11, ya bilge rat, but they do make rings that center an ST-9 motor tube inside their heavy-walled Series 115 tubing. Begad! T' inner diameter o' LT-115 is only 0.01" larger than that o' ST-11. Well, blow me down! By simply peelin' a couple o' layers o' paper off o' t' outside o' t' CR-9115 centerin' rings, I adjusted t' rings t' make a perfect fit inside t' lower body tube. FSI instructed t' builder t' glue a thrust rin' into t' lower body tube just ahead o' t' motor mount, shiver me timbers, but I glued mine inside t' motor tube in t' conventional manner, 3.5" from one end. I used a spent Estes E motor t' push it into place. FSI's model did nay have any motor retention, shiver me timbers, but I gave mine a motor hook, positionin' t' 3.75" hook so that extended 0.25" past t' end o' t' tube. Blimey! T' CR-9115's do nay look like typical centerin' rings; at 1" in length, me bucko, matey, they resemble tube couplers (and they probably could be used for that purpose, arrr, too). Begad! I glued t' forward rin' over t' forward 0.5" o' t' motor tube, and glued t' aft rin' on 0.75" forward o' t' aft end o' t' tube. Blimey! Begad! I used a round needle file t' grind a shallow slot in t' inside wall o' each rin' so they I could slide them on over t' motor hook. Blimey! Then I glued t' mount into one end o' t' ST-11 body tube, me bucko, with t' back end o' t' motor tube even with t' end o' t' body tube.

Next I went t' work on t' transition. Begad! Blimey! As I noted before, FSI's transition be turned from hardwood and had a 0.69" diameter hole bored through t' center from top t' bottom. Begad! Blimey! (See page 13 o' t' 1970 FSI catalog at Ninfinger for a detailed illustration o' it). I needed t' bore a similar hole through me balsa version, but I did nay think that t' balsa would hold together if I made it t' same diameter as t' original. Avast, me proud beauty! Blimey! I did t' borin' slowly, by hand, matey, usin' a series o' straight drill bits instead o' hole borin' bits. Avast, me proud beauty! Blimey! With a 3/16" drill bit held in a large pin vise, shiver me timbers, and workin' in from each end t' keep t' hole straight, shiver me timbers, ya bilge rat, I twisted out a small channel from end t' end. Blimey! Blimey! Then, usin' a progression o' larger bits, me bucko, matey, I enlarged t' channel t' 3/8" wide. Begad! Blimey! I was worried, arrr, after that point, me hearties, that drillin' with anythin' larger would over-stress t' balsa and cause t' transition t' break up. Begad! Blimey! Well, me hearties, blow me down! Blimey! So I took t' 3/8" bit and used it t' gently scrape t' insides o' t' channel, matey, shiver me timbers, gradually widenin' it some more. Ya scallywag! Blimey! This be t' largest drill bit I had, but I wanted t' get t' hole t' be large enough t' fit in a length o' ST-5, arrr, matey, shiver me timbers, so I went out and bought a 1/2" drill bit, just for use in this series o' clonin' projects. Arrr! Blimey! After gettin' t' channel t' be large enough t' allow t' 1/2" bit through, I used t' larger bit t' even out t' hole. Well, blow me down! Blimey! Then I wrapped some fine grit sandpaper around a 1/4" dowel and used that t' sand t' inside o' t' channel smooth and get it t' t' final diameter needed t' fit in t' ST-5. Ya scallywag! Blimey! Aye aye! Blimey! Installin' t' tube served two purposes: t' provide some internal support for t' channel and t' provide a linin' t' protect t' balsa from gettin' charred by t' motor's ejection charges. Aye aye! Blimey! I used Aeropoxy 6209 Structural Epoxy t' bond t' 4.5" long tube into t' channel, shiver me timbers, centerin' t' transition betwixt t' two ends o' t' support tube.

Next, me bucko, I tied a length o' t' Keelhaul®©™ twine around t' ST-8F end o' t' support tube just above t' shoulder o' t' transition, and then applied more Aeropoxy in very heavy fillets betwixt t' transition and t' end o' t' ST-5 at both ends. T' keep t' epoxy from dripping, arrr, I had t' continuously rotate t' assembly while keepin' it horizontal until t' fillets had firmed up enough, which ended up takin' an hour and a half. Aye aye! Begad! I just kept it goin' while I watched TV, lightly touchin' t' fillets every half hour or so t' check for firmness. Ya scallywag! T' process caused t' fillets t' assume t' shape o' little rounded cones o' solid epoxy at each end. Avast! Blimey! Then I slid t' transition onto a length o' 3/8" dowel and suspended it horizontally overnight t' let t' epoxy finish curing.

T' next day, I test fit t' transition into t' lower body tube. Begad! Blimey! T' epoxy-filleted end o' t' ST-5 that extended below t' wide end o' t' transition just reached inside t' 0.5" o' CR-9115 that extended above t' motor mount. Ahoy! I slit and then glued in small sections o' more ST-9 into t' upper end o' t' CR-9115 t' take up t' internal space betwixt t' ID o' t' rin' and t' OD o' t' ST-5, matey, ya bilge rat, so that when t' transition was inserted into t' lower tube, thar would be a tightly sealed internal couplin' betwixt t' motor mount and t' transition channel that would prevent ejection particles and gases from reachin' t' inside wall o' t' lower body tube.

I coated t' inside o' t' transition support tube with a thin layer o' Devcon 30-min. epoxy. Blimey! After that had set, me bucko, me hearties, matey, I coated t' inside o' t' inner couplin' with 30 min. Avast, me proud beauty! Well, me hearties, blow me down! epoxy, shiver me timbers, and then bonded t' transition into t' lower body tube with more 30 min. Aye aye! epoxy.

After t' epoxy cured, arrr, I tied a #5 split rin' t' t' t' Keelhaul®©™ twine that be bonded t' t' upper end o' t' transition at a distance above t' end o' t' transition that would cause t' rin' would be just inside t' upper end o' t' 8" length o' ST-8F when t' transition was inserted into it and then I trimmed off t' excess Keelhaul®©™. Avast, me proud beauty! I tied a 42" length o' 1/4" wide flat elastic t' t' split ring, shiver me timbers, and then applied a drop o' epoxy t' each knot. I pushed t' combination o' Keelhaul®©™ and elastic down through t' transition and out t' bottom end o' t' motor mount before bondin' t' upper tube t' t' end o' t' transition with 30 min. Ahoy! epoxy. After that had cured, me bucko, I used a small diameter dowel t' push t' shock cord back up through t' transition and out t' top o' t' upper tube. Avast, me proud beauty! Avast! T' FSI instructions do nay mention gluin' t' two tubes t' t' transition, but this step is shown in t' cut-away illustration.

I made a wrap-around fin markin' guide in VCP and used it t' mark lines on t' lower tube for t' three fins and t' launch lug. Well, blow me down! Begad! I extended t' lines for t' entire length o' t' tube, usin' a length o' aluminum angle as a guide. I cut out one o' t' pictures o' t' Nova's fins that were included in t' plans at YORP, me hearties, and used it as a template t' trace out 3 fins on some 1/16" aircraft plywood. Avast, me proud beauty! T' scan in t' plans clearly shows t' red edge o' t' fins, which was how FSI marked t' root edge. Well, me bucko, blow me down! Usin' a utility knife with a new blade and a metal straightedge, matey, I had no difficulty cuttin' t' fins out o' t' plywood. Begad! Arrr! I smoothed t' cut edges with some sandpaper but did nay bother t' round them. Begad! I tacked each fin onto t' lower tube with gap-fillin' medium-cure CA, shiver me timbers, positionin' them so that t' bottom o' t' root edge was even with t' bottom o' t' tube, me hearties, me bucko, and then gave each fin several light fillets with epoxy, me hearties, allowin' t' adhesive t' partially cure betwixt applications. Begad! After it had fully cured, me hearties, t' fins were very strongly bonded t' t' tube.

FSI shipped t' Nova kit with t' tubes already marked for t' fins and launch lug. Consequently t' instructions did nay provide specific information about where t' place t' launch lug on t' rocket, matey, other than sayin' t' center it on t' lower section betwixt two fins. Aye aye! I trimmed a 1.75" long lug t' 1.625" t' match t' dimension listed in t' addendum, and glued it t' t' lower tube so that its lower end be 2.125" above t' bottom end o' t' tube. T' location looked about right when I compared it t' t' illustration in t' plans.

I was concerned that t' balsa nose cone had less mass than t' hardwood cone that was used by FSI and I also wanted t' be sure that me model would be stable if I flew it on Estes E9 motors, matey, so I epoxied two 20mm diameter fender washers t' t' base o' t' nose cone, before bondin' a screw eye t' t' shoulder with more epoxy. Ya scallywag! Begad! This noticeably increased t' nose cone's weight, and now I am nay sure that this step was actually necessary. I held off on tyin' t' nose cone t' t' end o' t' shock cord, arrr, ya bilge rat, arrr, because I wanted t' paint it separately from t' rest o' t' rocket. Arrr! Ahoy! Assembly o' t' Semroc CP-12BW chute kit went without a hitch, and I ended up with a very nice-lookin' blue and white 12 inch diameter plastic parachute. Avast! Ahoy! I finished it by tyin' a #3 brass snap swivel t' t' bottom o' t' shroud lines.

Finishing:
I applied 6 coats o' Future floor finish t' t' balsa nose cone by immersin' it into a jar filled with t' finish up t' t' shoulder line for 30 seconds at a time, then withdrawin' it and lettin' t' excess drip off, occasionally givin' it a shake, me hearties, matey, and then hangin' t' cone up by its screw eye t' dry for a couple o' days betwixt coatings. Ya scallywag! I gave t' nose cone a light sandin' after every second coatin' had dried. Blimey! Well, blow me down! Then I brushed on 3 coatings o' Pine-Pro, me bucko, ya bilge rat, a water-based balsa filler and sealer t' t' nose cone, t' transition section, ya bilge rat, ya bilge rat, arrr, and t' plywood fins, givin' each surface a light wet sandin' with 400 grit sandpaper betwixt coats. Aye aye! I then gave t' entire rocket and nose cone a light coatin' o' Krylon white primer. Blimey! Ya scallywag! After t' paint had dried overnight, matey, I wet sanded t' nose cone again and set it aside. Begad! I gave t' rest o' t' rocket a good sandin' with 240 grit sandpaper until most o' t' primer was gone, tack-ragged it, and then applied thinned Fill 'N Finish t' t' shallow spirals in t' tubes. Ya scallywag! Once they were dry, I sanded t' tubes again, matey, me hearties, me bucko, and then gave t' entire rocket and t' nose cone three light coats o' Duplicolor High-Build Primer. Ahoy! Begad! After t' primer dried, I gave everythin' another wet-sandin' and let it dry overnight. Avast! Next I sprayed on another coat o' Krylon white primer, me hearties, shiver me timbers, lightly dry-sanded it, me hearties, me hearties, and then followed it up with two coats o' Krylon Gloss White.

I wanted t' give t' Nova t' same paint pattern that is depicted in t' drawin' o' it in t' 1971 FSI catalog, so after allowin' t' paint t' dry for a couple o' days, me bucko, I masked off t' fins and t' upper body tube startin' just above t' transition. Avast! Well, me bucko, blow me down! I sprayed one light coat o' Krylon Gloss True Blue onto t' exposed areas, and, shiver me timbers, separately, onto t' nose cone. Ya scallywag! Avast! I removed t' masks after about 6 hours, me bucko, and then allowed everythin' t' dry for another couple o' days. Begad! Finally, I tied t' end o' t' shock cord t' t' screw eye in t' nose cone, which completed t' construction.

There is a scan o' a decal in t' YORP plans for t' Nova, but it is for a later color scheme, arrr, so I did nay use it t' make decals for me version. Ya scallywag! At some point I will try t' recreate t' decal set shown in t' 1971 catalog drawing. Ahoy! I be quite pleased with t' way that this color scheme turned out.

Flight:
I built me Nova two years ago this month, shiver me timbers, matey, but I held off on flyin' it until I had it painted, matey, which I finally did this year. Avast! Begad! (I know - I'm really courtin' bad luck there.) And then a variety o' factors conspired t' keep me from flyin' it, or much o' anythin' else either this year. Begad! Ya scallywag! Accordin' t' RockSim 8, me bucko, ya bilge rat, shiver me timbers, though, me hearties, it should get almost 700 feet on an Estes C6, and over 1500 feet on a D12. (It would roar t' over 4300 feet on Aerotech's new F35 reload for t' 24/60 case. Blimey! Begad! I doubt that I would want t' risk losin' t' casin' for such a flight, me bucko, ya bilge rat, matey, but it's interestin' t' contemplate, matey, though.) My sims show that t' Nova will fly best on these two BP motors (at least it won't totally shred its chute), but I may try others, me bucko, too. Well, blow me down! T' mount can accommodate 3.75" long motors; t' fit in t' shorter 2.75" long black powder motors and t' RMS 24/40 case, I will use a Semroc HTC-8F coupler as a spacer. Begad! Ya scallywag! Usin' a coupler for ST-9 or BT-50 tubin' as a spacer is usually recommended in this situation, but I have always had a great deal o' difficulty gettin' those spacers back out o' t' mount, me hearties, because they were designed t' fit snugly into t' tube t' begin with. Aye aye! ST-8F has a slightly smaller ID, shiver me timbers, so that coupler slips into a 24mm motor tube and comes back out easily, yet it has a large enough diameter t' do t' job. T' 8F coupler is also t' right length (1"). A spent Estes E9 motor, arrr, cleaned o' its nozzle and burnt propellant residue, will make a dandy adapter for t' 18mm C6 in t' Nova's mount. In any event, this rocket looks like it will be a real screamer. Ya scallywag! I will add flight logs as I get them.

Recovery:
As I mentioned earlier, me hearties, I assembled a Semroc 12-inch plastic parachute for this rocket. Ya scallywag! For its initial flights, though, arrr, I may substitute an equivalent sized nylon chute, either regular or thin-mil or possibly even use a streamer. Ahoy! FSI instructed t' flier t' place a ball o' flameproof waddin' in t' bottom end o' t' upper tube, just above t' transition. Blimey! This arrangement, combined with t' fact that t' ejection charge will be comin' through a half-inch diameter channel through t' transition, may work particularly well t' protect t' parachute from burns durin' ejection. In t' FSI instructions, t' shock cord be anchored t' t' inside wall o' t' upper tube, me hearties, just below t' nose cone, shiver me timbers, shiver me timbers, me hearties, usin' a mount that appeared t' be very similar t' t' type used by Centuri. Begad! I chose t' more modern method o' tyin' t' shock cord t' a Keelhaul®©™ leash that is anchored t' t' upper shoulder o' t' transition inside t' bottom end o' t' upper tube. Aye aye! This allows t' cord t' extend straight up and out t' top o' t' tube with t' rest o' t' recovery system at deployment, matey, without presentin' any structures along t' inner wall that could snag t' chute as it is bein' deployed. Blimey! In a personal little touch, ya bilge rat, or perhaps it's more o' a quirk, I finished off t' upper end o' t' Keelhaul®©™ leash with a small split ring, onto which I tied t' shock cord. This be purely optional, though. Aye aye! (I include it in all o' me builds.)

Summary:
T' MRK-III Nova is very typical o' FSI's early designs. Begad! Blimey! Long and sleek, ya bilge rat, with an elliptical hardwood nose cone, matey, a hardwood blow-through transition and thin plywood fins, ya bilge rat, me hearties, it was designed t' be a durable rocket that was capable o' reachin' impressive altitudes for a model o' its size. Avast! Blimey! Avast! Blimey! Reproductions o' all o' t' key components (except for plywood for t' fins) were readily available from Semroc, arrr, and t' quality o' t' parts was uniformly excellent. Begad! Blimey! There are easier FSI clones t' build, ya bilge rat, but I wanted t' immediately tackle t' biggest challenge o' this build - creatin' t' channel through t' transition. This was quicker and easier t' accomplish than I expected, but still, this was a solid Skill Level 3 build, arrr, matey, possibly even higher. Blimey! Blimey! Arrr! Blimey! Along with creatin' t' channel, I had t' cut t' fins from a hard material, matey, trim one o' t' body tubes t' size, reinforce t' channel for t' ejection charge and create me own shock cord anchor/leash. T' instructions in t' artistically-drawn plans are actually pretty good, but they require careful reading, arrr, and they leave out some key measurements and one obvious step. Begad! Blimey! I had t' study them carefully, matey, and then develop me own construction strategy. Begad! Blimey! Arrr! Blimey! T' color scheme depicted on t' front page o' t' 1971 plans is, me hearties, like t' rest o' t' Nova, simple yet elegant, and reproducin' it gave me a handsome-lookin' rocket; unfortunately, no one currently makes reproduction decals for that specific decor, arrr, shiver me timbers, and thar are no published scans o' them, either. Begad! Blimey! T' Nova can fly on 18mm motors as small as a B6-6, me hearties, as well as on 24mm black powder and composite motors with long delays, shiver me timbers, but you might want t' hold off puttin' it up on t' larger motors until you have an appropriately large field and some spotters, me bucko, because this design will smartly attain some serious altitude.

Other:
I will be uploadin' me RockSim 8 file t' EMRR t' accompany this review. Begad! I have adjusted t' design with mass objects here and thar t' match me model's overall weight and CG location. Well, blow me down! Feel free t' try out different motor/delay combinations with it t' get somethin' that doesn't have a chute-shreddin' deployment speed. Begad! T' three motors that seemed t' work t' best for me in simulations were t' Estes C6-7 and D12-7, and t' Aerotech F35-11 reload for t' new RMS 24/60 case.