Scratch - Sprint 2.2 {Scratch}

FSI Sprint 2.2 Clone Clone

Scratch - Sprint 2.2 {Scratch}

Contributed by Bill Eichelberger

Construction Rating:
Flight Rating:
Overall Rating:

Published:	2012-09-30
Manufacturer:	Scratch

Brief

Back in 1977, arrr, shiver me timbers, I sent for an FSI catlog after findin' an address in t' back o' a library book. Begad! Avast, ya bilge rat, me proud beauty! While nay as flashy as t' Centuri and Estes catalogs I was used to, thar were a couple o' designs that caught me eye back then, me bucko, specifically t' Nova and Sprint. Ya scallywag! I eventually found an original FSI Nova that I built and flew, but t' Sprint remained elusive. I recently made a Semroc purchase o' parts that I thought I needed t' rebuild a Centuri Taurus upscale that I'd built and flown several years back, but found that I could reuse a lot more o' t' original parts than I thought. Blimey! This left me with two TA6070 transitions and no clear project for them. Aye aye! I hate t' waste anything, especially anythin' as well made as a Semroc balsa transition, arrr, ya bilge rat, hence me "FSI Upscale" phase.

Components

14.25" BT-70 body tube (BMS)
7.5" BT-60 body tube (BMS)
4" BT-40 engine tube (BMS)
TA-6070 balsa transition (Semroc)
BNC-70B nose cone (Semroc)
1/8" balsa stock
5020 engine block (Semroc)
36" Keelhaul®©™ shock cord
36" shock cord 1/4" sewin' elastic
medium screw eye
large snap swivel
reefed 18" parachute

Construction

There aren't a whole lot o' parts for this rocket, arrr, which greatly cuts down on t' chance o' gotchas. Arrr! I love projects like that. Avast, matey, me proud beauty! T' most work-intensive part o' t' project be drillin' out t' center o' t' TA6070 transition, which I accomplished usin' by first drillin' through t' transition with a 1/8" drill bit, arrr, then takin' out enough o' t' rest o' t' material t' make a BT-50 size hole with a Dremel tool and attachment.

As with most o' me projects, I tied a 36" piece o' Keelhaul®©™ behind t' front centerin' rin' t' anchor t' rest o' t' recovery system. Aye aye! Avast, me proud beauty! This be threaded up through t' Dremel hole in t' transition and attached t' a 36" length o' 1/4" sewin' elastic. Well, blow me down! Begad! A medium snap-swivel attached t' a hefty screw eye which was glued into t' nose cone bottom t' tie t' whole thin' together.

Finishing

After disposin' o' t' balsa grain and tube spirals with two coats o' thinned Elmer's Carpenters Wood Filler and LOTS o' sanding, me hearties, I sprayed t' rocket with white Valspar primer. Blimey! Blimey! I then sprayed one fin with Rustoleum Flourescent Orange, completely masked it off down t' t' body tube, shiver me timbers, then burnished t' edges o' t' tape t' keep any o' t' paint t' come from seepin' in. Ya scallywag! Begad! T' main body tube was sprayed with Valspar gloss white, me hearties, shiver me timbers, while t' nose cone and everythin' below t' transition be painted with Valspar gloss black. Ahoy! Well, arrr, blow me down! When all was dry I unmasked t' orange fin and as usual, was pleasantly surprised at t' "pop" that t' flourescent paint provides. Begad! I had no decals planned, shiver me timbers, but with t' white, orange and black scheme I was reminded o' t' Cincinnati Bengals, ya bilge rat, and found a photo o' a vintage logo that I remembered from grade school that was perfectly sized for t' upper body tube. Arrr! Ahoy! I'm nay sure how this ties in with t' whole Sprint thing, shiver me timbers, but it sure beats a big, shiver me timbers, blank section o' white body tube.

Construction Score: 5

Flight

To date I've made only one flight with t' Sprint, matey, but that be due t' a backlog o' first flight mid-power kits more than anythin' else. Avast, me proud beauty! Begad! Loaded with an Estes E9-4, t' rocket lifted off with authority and immediately began t' windcock. Begad! Ejection occurred as t' rocket be approachin' horizontal due t' t' wind, matey, but recovery was perfect and t' rocket recovered deep in t' cornfield on t' 12" nylon chute, matey, so deep that it initially appeared t' be in a neighborin' cornfield. Avast, me proud beauty! (This would have been a problem as thar be a decent size creek that separates t' two cornfields.) T' recovery walk was long, and t' search took me t' areas o' t' field where few humans had previously trod, but along t' way I found two rockets belongin' t' other fliers. (Second time I've done that.) After thirty minutes I finally caught a flash o' orange and walked right over t' t' rocket, which appeared t' be sittin' in a spot I'd passed at least twice. I swear I did. Well, blow me down! T' rocket was undamaged, me hearties, but t' length o' t' recovery walk on t' 12" chute had me wonderin' how much further it would have been with a 15" or 18" chute.

Flight Rating: 5