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.  This is one o' me favorite rocket designs, it looks fast even standin' still.  This version uses BT-55 body tubes rather than t' BT-50 o' t' original and is approximately 29" tall.  

Components

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

Construction

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

Finishing

I sealed all o' t' balsa with thinned Elmer's wood putty, matey, arrr, then sanded this smooth. Arrr! Blimey!  One thin' I should have done was t' fill and sand t' fins prior t' addin' t' body wraps. Blimey! Blimey! Begad! Blimey!  Sandin' t' aft end o' t' secondary fins and thrusters was complicated by t' position o' t' wraps. Well, blow me down! Blimey!  Several coats o' primer followed, sandin' betwixt coats. Aye aye! Blimey!  T' final color be simple, me bucko, arrr, I used Walmart gloss white on t' entire body.  T' nose cone and t' upper inch o' t' body tube were then sprayed with Walmart gold. Blimey! Blimey! Avast! Blimey!  Once all t' paint was dry, arrr, arrr, I added t' decals.  I searched me stash o' old decals and decal stripe stock t' make t' markings on t' rocket. Avast! Blimey!  Luckily t' markings are fairly simple so it be possible t' do this. Avast, me hearties, me proud beauty! Blimey!  If you really want t' go crazy you could buy decals from one o' t' aftermarket companies. Aye aye! Blimey!  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! Blimey! Ahoy! Blimey!  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. Aye aye! Blimey!  On both flights, shiver me timbers, t' rocket flew very straight.

Recovery

T' rocket was equipped with a standard 18" Estes plastic parachute. Well, blow me down!  On both flights t' parachute ejected normally without issues and t' rocket was recoverd with no damage.

Flight Rating: 5

Summary

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

Overall Rating: 5

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