Scratch Stiletto Original Design / Scratch Built

Scratch - Stiletto {Scratch}

Contributed by Jim Senecal

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Published: 2012-05-22
Manufacturer: Scratch

Brief

This is an upscaled clone o' t' Estes Stiletto. Ya scallywag! Aye aye!  This is one o' me favorite rocket designs, me bucko, it looks fast even standin' still. Ahoy!  This version uses BT-55 body tubes rather than t' BT-50 o' t' original and is approximately 29" tall. Well, blow me down!  

Components

T' parts list for this rocket includes an 18" Estes BT-55 body tube, matey, an additional 6" section o' BT-55, me bucko, and a tube coupler. Avast, me proud beauty!  T' nose cone came from t' Estes NC-55 nose cone set, ya bilge rat, and be t' pointed straight cone. Aye aye!  Also used was some 3/32" balsa stock for t' fins, shiver me timbers, a small section o' 1/8" balsa strip used t' make t' raceway and forward thrusters, an Estes 18mm engine mount, matey, an Estes 18" parachute, 1/8" launch lug stock, and some 1/8" elastic fabric cord for t' shock cord. Begad!  Decals came from me stock o' leftovers from other kits. Blimey!  

Construction

For intructions I downloaded t' original Estes instructions from t' JimZ website.  I made fin patterns by upscalin' t' JimZ patterns. Avast!  I then cut out t' fins from t' 3/32" balsa stock.  I added a section t' t' root edge o' t' main fins as I intended t' make through t' wall fins. Aye aye!  I rounded t' fore and aft ends o' t' main fins as well as t' small secondary fins. Ya scallywag!  I built t' engine mount in t' standard fashion, and added centerin' rings cut from some cardboard stock. Begad!  T' two body tubes were glued together with t' coupler. Avast, me proud beauty!  I inserted t' engine mount into t' body tube and allowed t' glue t' dry. Begad!  Once t' glue was dry I cut slits into t' aft o' t' tube large enough for t' main fin mounts. Aye aye!  I glued t' main fins on and allowed them t' dry. Ya scallywag!  I then lined up t' seconday fins above t' main fins and glued them on. Begad!  Glue fillets were applied t' all t' fins. Well, blow me down! Begad!  I then created t' raceway out o' t' 1/8" balsa strip and glued it on, me bucko, filletin' it as well. Aye aye!  T' forward thrusters were also made from 1/8" stock, shiver me timbers, and glued on in line with t' fins.  I cut two launch lugs each about 3/4" long, shiver me timbers, arrr, and mounted them on some thin cardboard. Avast! Aye aye!  T' lugs were then glued t' t' side o' t' rocket as well, matey, spaced along a side away from t' raceway.  T' final bit o' buildin' on t' body was t' create t' three raised bands around t' body. Avast!  One band goes directly t' t' aft o' t' small secondary fins, another directly t' t' aft o' t' foward thrusters, ya bilge rat, and t' last just above t' fore end o' t' raceway. Arrr!  I made t' bands from t' facecard frome an Estes rocket kit. Arrr!  T' bands are about 1/4" wide and wrap around t' circumference o' t' body tube. Arrr! Avast, ya bilge rat, me proud beauty!  T' wraps were glued on with white glue. Arrr!  Finally I added a shock cord usin' t' standard tri-fold method, arrr, matey, shiver me timbers, substitutin' fabric elastic for t' typical rubber cord.  For a rocket this size I have had fair winds with this type o' cord.  Constuction went well, ya bilge rat, proceedin' without any problems.

Finishing

I sealed all o' t' balsa with thinned Elmer's wood putty, then sanded this smooth. Ahoy!  One thin' I should have done was t' fill and sand t' fins prior t' addin' t' body wraps.  Sandin' t' aft end o' t' secondary fins and thrusters be complicated by t' position o' t' wraps. Avast, me proud beauty!  Several coats o' primer followed, arrr, sandin' betwixt coats.  T' final color was simple, I used Walmart gloss white on t' entire body. Blimey!  T' nose cone and t' upper inch o' t' body tube were then sprayed with Walmart gold. Avast!  Once all t' paint was dry, ya bilge rat, me hearties, I added t' decals. Aye aye!  I searched me stash o' old decals and decal stripe stock t' make t' markings on t' rocket. Avast, me proud beauty!  Luckily t' markings are fairly simple so it be possible t' do this. Ahoy!  If you really want t' go crazy you could buy decals from one o' t' aftermarket companies.  I really had no issues overall with t' paintin' or decaling.

Construction Score: 4

Flight

This model has been flown twice usin' Estes B6-4 motors. Begad!  T' rocket performs very well on this motor, and would really go on a C6, but at me flyin' field it would probably be lost. Avast, me proud beauty!  On both flights, t' rocket flew very straight.

Recovery

T' rocket was equipped with a standard 18" Estes plastic parachute. Begad! Blimey!  On both flights t' parachute ejected normally without issues and t' rocket be recoverd with no damage.

Flight Rating: 5

Summary

Overall this is a great rocket design.  It is only slightly more complicated than an ordinary 3FNC design, me hearties, matey, but really looks sophisticated. Begad! Blimey! Ahoy! Blimey!  It also has t' look o' a real Air Force missle with t' markings and t' raceway. Avast, me bucko, me proud beauty! Blimey!  It also flies excellent.

Overall Rating: 5

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