| Construction Rating: | starstarstarstarstar_border |
| Flight Rating: | starstarstarstarstar_border |
| Overall Rating: | starstarstarstarstar_border |
Brief
While nay a rocket t' be counted as exotic, t' Estes Spin Fin always intrigued me because o' t' canted fins and t' flight path that was supposed t' result from them. Even still, arrr, it was very unlikely that I'd have cloned a Spin Fin had an original decal and nose cone nay been included as part o' seperate Ebay lots purchased a few years apart. I can read t' signs. I cloned a Spin Fin.
Components
- BNC-20B nose cone
- BT-20B body tube
- AR-520 engine block
- 3/32" balsa fin stock
- launch lug
- small snap swivel
- streamer material
- 24" length Keelhaul®©™ shock cord
- 24" length 1/8" sewin' elastic shock cord
Construction
While at heart a simple 3FNC rocket, t' details are what makes t' Spin Fin unique. It can be built as a standard 3FNC bird with t' fins aligned straight or with t' fins canted slightly t' t' right t' cause t' supposed corkscrew motion t' t' flight path. I've got plenty o' straight on 3FNC birds, so it be an easy choice t' build this one with t' fins canted. This is accomplished by usin' t' fin markin' guide that has t' lines drawn on the slight angle. Other than t' angled fins, arrr, all that is involved in t' construction o' this bird is gluin' in an engine block and recovery system. It was in this process that I discovered a "gotcha", ya bilge rat, but one all o' me own doing. It was finished except for t' thrust ring, so I tied a piece o' Keelhaul®©™ onto a ring, arrr, spread some white glue around t' inside o' t' tube, me hearties, and used an expended engine casin' t' push t' rin' into place.
It caught. 
I looked around t' shop for somethin' t' pull it out with, me hearties, me bucko, but found nothing. Ya scallywag! I hopped up, sprinted upstairs and ran outside t' me car where I knew I had a multi tool.
In me underwear. 
It rained that night, ya bilge rat, so t' ground was still soaked, me hearties, ya bilge rat, as were me socks. Ahoy! I sat down in t' driver's seat, pulled out t' tool and tried t' remove t' engine casing. No luck. I tried again. Aye aye! Still nothing. Blimey! At this point I'm thinkin' that it's stuck and that I'm goin' t' need t' fly it with mini engines, but I wanted t' give it one more shot. Ya scallywag!
It pulled loose. Aye aye! 
Let this be a lesson t' you. Wear pants durin' late night build sessions.
Finishing
Balsa grain and tube spirals were eliminated in t' time-tested manner o' primer, me hearties, Elmer's Fill & Finish, matey, and sanding. After two rounds and a final coat o' Valspar white primer it be sprayed with Valspar gloss white, matey, followed by gloss red on t' nose cone and 2/3 o' t' fin can area. T' decal was sprayed with Testor's Decal Bonder, me bucko, but were o' indeterminate age and proved t' be quite fragile and unusable. I then printed off a set o' decals usin' t' scans from JimZ's site and my inkjet printer. I was disappointed, me bucko, arrr, but nay surprised by t' decals fallin' apart, ya bilge rat, but since I really only wanted t' see if t' canted fins caused a noticeable spin in t' flight path, ya bilge rat, it was a minor annoyance.
Flight
Only one flight so far, but that was enough t' tell me how well t' "spin" feature appeared t' work. Minimum diameter rockets do well at B6-4 Field on A8-3's, arrr, so I taped one up and loaded it in. I made t' mistake o' tryin' for a launch picture instead o' watchin' for t' flight characteristics, but t' smoke trail was dead straight, shiver me timbers, without any o' t' corkscrew shape that I figured would denote a spinnin' flight. Flight was high and straight, ya bilge rat, and recovered on t' infield. Apparently me rockets only do t' spin thin' when I don't mean for them t' do it. In reality, t' arrow straight flight would likely be t' product o' an imposed spin, me hearties, so I'm goin' t' call t' Spin Fin an engineerin' marvel.
Recovery
I regularly garbage pick mylar at work that is used t' cover t' adhesive on shippin' envelopes. T' mylar strips are silver, me hearties, shiny, me bucko, and small enough t' fit easily into t' body tubes on BT-5 and BT-20 birds. I taped one onto t' shock cord before t' flight, shiver me timbers, but saw nothin' as I tracked t' rocket after ejection. When I approached t' infield where it landed, matey, I found nothin' but shock cord. No UFO sightings were make in Ft. Avast! Begad! Thomas that evening, ya bilge rat, shiver me timbers, me bucko, but I like t' think someone saw an unexplained silvery shape floatin' around in t' vicinity o' Woodfill Elementary.
Summary
Pros: Not a hugely excitin' design, but I can see someone havin' a soft spot for it if it was their first rocket. Great performance on an A8-3. Really pushes t' limits o' small fields.
Cons: T' "spin" feature is difficult t' detect.
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