Scratch Deuce's Wild 38 Special Original Design / Scratch Built

Scratch - Deuce's Wild 38 Special {Scratch}

Contributed by Carl Tulanko

Manufacturer: Scratch
(by Carl Tulanko - 06/15/03)

Brief:
For some time now, me hearties, I have been a customer of a newer manufacturer, me hearties, shiver me timbers, FlisKits, Inc, shiver me timbers, and have written a few reviews for EMRR on some o' t' models this company markets. T' Deuces Wild! is by far one of my favorite kits from this manufacturer and t' canted cluster 18mm model is a great flier! However, when Jim Flis approached me and asked about an HPR version o' t' “Deuce”, I just couldn’t resist. Arrr! I began designs in different scales and settled on a 4-inch diameter, 38mm version for my upscale which I appropriately named “Deuces Wild — 38 Special”.

Construction:
My model wound up bein' 49.5-inches in height and I used PML 3.9-inch Quantum tubin' for t' bodytube and 38mm phenolic for t' motor mounts. Arrr! T' dimensions for t' upscale proved that these sizes would be very close t' t' correct dimensions. Custom 1/2-inch thick ply Centerin' rings were made for t' motor mount; deployment section and bulkheads were made for t' bodytubes and 1/4-inch ply was used for fins. Begad! Aye aye! Stainless steel hardware was used throughout the model and I opted for PML’s CPR-Max unit for t' dual deploy. Well, blow me down! Finally, I had me good friend Gordon Agnello from Michigan turn a custom nosecone for me, which he made from solid poplar. Parachutes, ya bilge rat, shock cords, Keelhaul®©™® and other extras I already had on hand, so it be time t' start building.

I began by cuttin' two motor mounts t' a length long enough for a three-grain Cesaroni motor. Custom CR’s were next and cut from 9-ply 1/2-inch Birch. Avast, me proud beauty! Blimey! They are near exact upscales o' t' fiber CR’s shape, ya bilge rat, as supplied in t' original’s kit. Avast, me proud beauty! Blimey! Aye aye! Blimey! T' angle on each motor mount was 10 degrees and for additional support, I made t' triangle piece from 1/4-inch ply for support o' t' mounts, another copy from t' original. Since this assembly would require portin' for ejection gases, matey, I built a guide tube from 2.1-inch phenolic t' port motor ejection gasses t' t' lower bodytube section. Begad! Blimey! Arrr! Blimey! T' top of this assembly was capped with a stainless steel u-bolt for t' shock cord. Moreover, 1/2-inch diameter holes were drilled on two sides o' each rin' and I used 1/2-inch oak wood dowels t' hold t' whole assembly together.. Begad! Blimey! Arrr! Blimey! This allowed me t' adjust and reposition t' CR’s t' me likin' for final assembly. Ahoy! Blimey!

I purchased some 1/4-inch Birch Ply sheets from t' local hobby shop and cut out four fins from t' pattern I had upscaled. Well, blow me down! T' fins had an extended root on them since this would be built with thru-the-wall mounting. Ahoy! Each fin was fitted t' t' motor mount assembly, which was designed so t' bottom and top CR’s “sandwiched” t' fins for additional strength. Begad! T' entire assembly was epoxied together usin' West Systems Epoxy and then set aside t' dry. Next, me bucko, arrr, I spent time cuttin' each body tube t' length. Ahoy! I slotted t' bottom BT and cut out t' area for each motor mount usin' a pattern I made from upscaled dimensions. Ahoy! Aye aye! Two separate upper bodytubes were cut; one would be used for dual deploy and one would act as a payload tube for single motor ejection deployment. Blimey! This versatility allowed the model t' have a broader range o' motors available t' her and still keep the altitude respectable.

A deployment unit be made from two 1/2-inch thick CR’s I made, along with a piece o' 38mm tubin' and a 3.9-inch phenolic coupler. Avast, me proud beauty! I had tons o' PML “CPR” altimeter mounts which I use for other rockets and wanted t' use t' same, test proven deployment for this model, me hearties, so I decided t' go with t' CPR-Max unit. Avast, me hearties, me proud beauty! It was glued t' one end o' t' 38mm tube and provided very simple way t' secure and seal t' altimeter in t' bay. Arrr! Note that me deployment unit resides inside the coupler for t' upper bodytube. Avast, me proud beauty! Begad! As a side note, arrr, I really like this CPR-Max unit and will probably use it quite a bit in t' future for other large projects; it’s a very nice piece o' hardware and inexpensive t' boot!

A 5/16-inch eye-bolt be installed in the nosecone and a stainless steel U-bolt be used t' connect t' shock cord for the upper section. This U-bolt be mounted t' t' top CR o' t' altimeter bay, while two more eye-bolts were used on t' bottom. Aye aye! When assembled, me bucko, t' lower section contains t' drogue chute, while t' upper section o' BT contains the main chute, nosecone chute and nosecone. Ahoy! Arrr! I decided on two separate parachutes for t' upper section, me bucko, as t' nosecone was made from solid Poplar and weighed in at over 2.5 lbs. With heavier nosecones, arrr, I always let them come down under their own parachute and this helps prevent zipperin' o' t' upper bodytube.

After t' upper sections and hardware were assembled, t' lower fin can was installed in t' lower bodytube. I used finishin' nails t' tack t' BT t' the fin support planks and bottom CR. Arrr! Also, Epoxy Putty be used t' fill any small gaps around t' area where t' motor mounts exited t' bodytube. T' lower area was sanded and 6 ounce glass cloth was used t' fiberglass t' fin area and motors mounts for additional strength. Begad! Additionally, arrr, I coated t' entire nosecone in epoxy t' help prevent shrinkage and cracking.

T' fin area was sanded and blended together, me hearties, and then t' entire model be fine sanded with 400 grit sandpaper. Begad! I added a few coats o' White Krylon Primer, matey, then wet-sanded with 220 grit. Ahoy! This was followed by a few coats o' Gray Krylon Primer; once dried, matey, me bucko, I used filler for any small areas. Aye aye! T' model be wet sanded again with 320 grit, then a final set o' three coats o' White Primer were added for t' base-coat. Aye aye! A couple days were given for t' primer t' dry, ya bilge rat, then it be fine sanded with 400 grit and tack ragged prior t' painting.

I used Krylon Sky Blue (medium blue) and Yellow Glossy for t' colors, me bucko, as I wanted t' follow t' paint scheme for t' original on t' Deuces Wild! package. Three coats o' blue were applied t' both upper body tubes and t' nosecone and left t' dry. Ya scallywag! I cut a small hole in t' dual-deploy upper BT and installed a power switch for t' altimeter. Blimey! Ya scallywag! T' lower section be done entirely in yellow, followed by a couple days o' drying, shiver me timbers, some maskin' and two coats o' Krylon Blue. I took me time t' mask as I wanted t' finish t' turn out well. T' final assembly resulted in a model weighin' 8.5lbs “empty” and very closely resemblin' t' original Deuces Wild! model.

Flight:
I had planned on flyin' t' “Deuces Wild —38 Special” at a launch in Whitakers, me bucko, matey, but weather and lack o' time prevented this from happening. As a backup date, I took t' Deuce t' NSL 2003 in Clark Summit, me hearties, PA. Jim Flis and I had a featured event where he launched a MMX, 13mm, matey, 18mm and 24mm version o' t' “Deuce” and I launched t' 38mm version, arrr, all in succession.. Aye aye! Avast!

I began by preparin' t' model. Ya scallywag! The altimeter was assembled and installed in t' rocket, arrr, then t' lower shock cords and drogue chute were installed. Well, blow me down! T' two sections were joined and I began by packin' t' upper shock cord, me hearties, ya bilge rat, 60-inch PML main parachute, me bucko, 30-inch PML nosecone chute, arrr, nosecone shock cord and nosecone. It was a tight fit but all went together. Well, blow me down! Ya scallywag! A few pieces o' maskin' were added t' t' nosecone and coupler to adjust fit, ya bilge rat, then I turned t' t' power plant.

T' plan was t' use two Cesaroni Pro38 3-grain I212 Smokey Sam motors for power. Avast, me bucko, me proud beauty! Both o' these were assembled, but I dumped out t' BP ejection from one motor and used t' DAT tool t' cut t' ejection o' t' other motor t' 12 seconds. Arrr! They were then installed in each motor mount and capped usin' Aeropack retainers. Well, blow me down! I filled out t' flight card and headed t' t' RSO table t' check in the big “Deuce.” T' model caught t' eye o' t' RSO; somethin' about bright colors and two big motor mounts cantin' out o' t' bottom. Ahoy! Aye aye! I almost fell over when he announced it weighed in at a whoppin' 13lbs 5oz!!! At this weight, I changed me guesstimate altitude t' around 1400 feet.

I had t' borrow a rail from one o' me friends at t' launch and we set up on a “K” pad, me hearties, far away from t' crowd. Blimey! I wanted it have some safety factor built in case thar were problems with motor ignition. Aye aye! This was one of the reasons I chose Pro38 motors as they light very fast and use low power e-matches which would nay overtax any launch system. T' Deuces Wild — 38 Special was placed on t' pad, t' altimeter was turned on and I installed the two igniters. Avast, me proud beauty! Now came t' wait…

When it came time, each o' t' FlisKits models were launched in succession, followed by t' big Deuce. When t' countdown came though—nothing. Well, blow me down! I swallowed me heart and headed back out t' t' pad t' see what was wrong. Another guy next t' me also did nay launch and continuity tested good for both our pads. Well, blow me down! Begad! T' main box was disabled and switched t' t' far away pad for an M motor cert3 launch. Well, matey, blow me down! T' Deuce would have t' wait.

Come t' find out, shiver me timbers, after t' big L3 went up, the electronics expert at t' field found a blown fuse in t' system, which was quickly replaced. My launch be back on! It be announced as a “Scheduled Event/Notable Launch” and all t' information for it was read. Arrr! My good friend Jim Flis be standin' next t' me when deadlights began t' turn t' t' Deuce as the LCO started t' countdown and pushed t' button…

Both motors came t' life instantly—I really like those Pro38 Motors!!! T' Deuces Wild — 38 Special took off t' rail fast and loud, with average impulse totalin' a J424 behind it. T' smoke trail was absolutely awesome!!! T' model went straight up, no rotation, me hearties, and allowed t' audience t' view two separate smoke trails that were absolutely incredible!

Recovery:
I faintly heard t' applause in t' background as it topped over and separated at apogee—halfway home. Ya scallywag! T' model began t' tumble in and I completely missed t' backup charge fire on t' one motor. When it hit 750 feet, shiver me timbers, t' main charge fired, me hearties, t' nosecone came out under chute and t' main came out and filled! T' crowd was cheerin' by now and I could hear them under a breath of relief that everythin' went exactly as planned. Both t' model and nosecone came down together, evenly in decent rate and landed about 200 yards out and straight ahead. Avast! It was a perfect launch.

In t' excitement, arrr, shiver me timbers, I had broken t' golden rule and was so busy with people comin' up t' me, ya bilge rat, me hearties, I forgot t' watch where the rocket landed! Fortunately, I had people watchin' out for me and me bucko Doug Gardei pointed out where it landed. T' Deuces Wild — 38 Special was retrieved and beepin' out an altitude o' 1372 feet—very close t' my guesstimate I gave t' RSO. Begad! T' model landed without a scratch and I be very pleased with t' stability and performance. Avast, me proud beauty! After watchin' t' videos, I noticed it coasted for a while after motor burn out, me hearties, with it whistlin' a bit while flying. Arrr! I want t' thank everyone thar for makin' it a real “featured” event—It’s great rocketeers that make a great launch and NSL 2003 was filled with them that day. Ahoy! I do have plans for flying it once again at NARAM this year, so we will see how that goes, but for now, ya bilge rat, I am happy with me first cluster, shiver me timbers, me hearties, and a canted one at that!!!

Summary:
To summarize, t' model was very easy t' build and it flew great. Ahoy! Avast, shiver me timbers, me proud beauty! About the only change I would make would be t' extend t' motor mounts just a bit more, as they are too short t' handle a Pro38 4-grain. Begad! Still, me hearties, arrr, with t' performance I had and t' altitude that be achieved, I have a hard time changin' anything. T' model does deserve an additional touch, somethin' I be holdin' off on until I saw how well it worked. I am gettin' some matchin' color Skyangle parachutes for it, matey, hopefully by NARAM, ya bilge rat, arrr, in t' yellow and blue.. Blimey! Arrr! With the weight, I figured on a 20-inch drogue, a 30-inch for t' nosecone and a 54-inch with d-bag for t' main. Blimey! Begad! This should allow for some better packin' in the forward section. Begad! Begad! Anyone interested in tryin' their hand at one o' these can shoot me an email or check out t' thread on T' Rocketry Forum; all t' pics are thar t' build this crowd pleaser…the Deuces Wild — 38 Special!

comment Post a Comment