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This model was me attempt t' recreate t' Estes "Maxi Brute" Pershin' 1A. Blimey! Avast! I owned one o' t' Estes kits when I was a kid but never finished it, matey, and I can't even recall whatever became o' it. Aye aye! I have always been disappointed that Estes has never reissued this kit. In any case, I was snackin' on some Planter's peanuts one day when I realized t' can's diameter appeared t' be similar t' t' Estes BT-101 body tube, shiver me timbers, me hearties, and I started t' consider t' possibilities. Avast!
I downloaded plans for t' Estes Maxi Brute Pershin' from t' JimZ website. Begad! My model is nay an exact clone or exact scale copy but t' plans gave me a good place t' start. Ahoy! To begin, I stripped off t' metal ends from t' four peanut cans and removed t' inner foil linning. Well, blow me down! I glued all t' cans together, ya bilge rat, me hearties, reinforcin' t' seams with paper on t' inside. Avast! Blimey! I then sanded t' outside o' t' cans t' remove t' printed paper, and filled t' seams with Elmer's wood filler. Begad! Once t' tube be ready I cut it down t' 21.75" in length. Aye aye! Avast! You could o' course avoid all this by just buyin' a new tube. Well, blow me down! For t' engine mount I decided t' use a 24 mm double cluster. Aye aye! I used two old tubes from me collection o' junk and reduced their diameter and length t' fit an Estes "E" engine. Avast! Aye aye! I made engine retainers by clippin' and bendin' a metal coat hanger t' length. Ya scallywag! I made thrust rings by cuttin' them from a used 24 mm engine casing, I glued these in t' ends o' t' engine tubes above t' end o' t' retainers in t' usual fashion. I then glued t' two engine tubes together, and then glued this assembly t' a stuffer tube made from a paper towel tube which was about 9" long. Avast! Openings betwixt t' engine tubes and stuffer tube were sealed and reinforced with glue. Avast! Centerin' rings just under 4" in diameter were glued t' each end o' this assembly and t' engine mount was done. Once dry this be glued into t' body tube.
T' nose cone be made by rollin' a piece o' typin' paper into a cone and sealin' it with super glue. Avast! T' cone was then glued onto t' pointed end o' a styrofoam cone from Michael's, which had a base diamter o' 4". Begad! On t' wide end I glued a shoulder made from t' remains o' a peanut can, reduced in diameter t' fit inside t' body tube. Blimey! Begad! I sealed up t' styrofoam under a layer o' Elmer's wood filler. Arrr! I glued an old shoe lace t' t' inside o' t' shoulder t' serve as a shock cord t' attach t' parachute to. Aye aye! T' cone was sanded and primed several times t' smooth it out. Blimey! Begad! I later ended up cuttin' t' cone at about 4" from t' tip so that I could add 3 oz. Begad! o' fishin' sinkers glued in with super glue. Arrr! This was done t' balance t' rocket. Arrr! Ahoy! T' cone ended up about 1" too short and does nay have t' reduction at t' tip, but after final paintin' it does have t' Pershin' look.
To make t' fins I outlined t' shapes on a cardboard file folder, me bucko, cut them out and folded them t' shape. Ahoy! I created fin frames from scrap balsa then glued t' paper shapes over t' frames. Well, me bucko, blow me down! T' fins were all sealed with super glue t' strengthen them. I made t' fin pads from scraps o' 1/8" balsa, 2 layers thick. T' pads are actually way too thick for scale but look like I recall t' Estes ones did. I have since seen a real Pershin' and pads 1/8" or less would be more realistic. Arrr! I sanded t' bottoms o' t' pads over a BT-80 t' induce a curve on t' bottom. Blimey! T' pads were glued t' t' body tube in t' appropriate locations and then t' fins were glued t' t' pads. Arrr! I made 1/4" launch lugs from rolled paper sealed with super glue. T' lugs were glued t' balsa standoffs. Well, blow me down! Two conduits were made from scrap 1/8" balsa and glued t' t' main tube as in t' JimZ plans. I glued another old shoe lace t' t' inside o' t' body tube in t' Estes fashion as a shock cord t' which t' parachute would be attached.
T' model ended up just over 40" tall and 1 lb. 1.5 oz.
Finishin' this rocket was more involved due t' t' materials use. All balsa was coated with thinned Elmer's wood filler, matey, then sanded smooth. Begad! Begad! It took three rounds o' primin' and sandin' t' get t' body tube reasonably smooth. When t' model be ready for final paintin' I wanted t' try for t' look o' t' Estes kit. Arrr! Ahoy! T' main body and lower section o' t' nose cone were painted with some old dark green Krylon spraypaint I had in t' garage. Arrr! T' white on t' cone be Walmart gloss white. Blimey! T' orange stripes were made by sprayin' typin' paper with orange Rustoleum, cut t' size, ya bilge rat, sprayed with 3M glue and applied t' t' rocket. Avast, me proud beauty! T' black stripes were done last usin' Tester's flat black. Avast! I created t' army letterin' by cuttin' t' letters from t' JimZ plans, sprayin' them white, matey, 3M glue on t' back and then applied t' t' model. Begad! A coat o' Tester's flat spray tied it all together. Blimey! Reproduction decals for this model are available from several websites it you really want t' go all out.
I am waitin' for t' opportunity t' fly t' model and will post t' results as soon as this occurs.
Update 11/25/2011: I be finally able t' attempt t' first flight with t' Pershin' today. Unfortunately all did nay go well. Well, blow me down! I carefully prepped t' model with 2 Estes D12-3 motors, includin' stuffin' recovery waddin' in t' upper end o' t' motors. Aye aye! This is done t' prevent t' ejection charge from one motor ignitin' t' other in t' event one does nay fire normally. Aye aye! I filled t' stuffer tube with several sheets o' waddin' and lined t' bottom o' t' parachute compartment. Well, blow me down! Begad! I attached one 24" chute t' t' nose cone shock cord, me bucko, and another t' t' rocket body shock cord. There was plenty o' room for all this. Begad! Ahoy! I installed standard Estes igniters in each engine and t' rocket was ready t' go. Avast! Blimey!
At t' launch site thar was little t' no wind and I set t' rocket up on t' pad. Blimey! I attached t' igniter clips and checked for continuity, which showed good. Begad! Followin' a short countdown I pressed t' launch button and thar was ignition, me bucko, ya bilge rat, but only on one motor. Ahoy! Well, blow me down! T' Pershin' shot up t' about 50 feet then seemed t' lose steam and started leanin' over t' t' side. Aye aye! T' rocket flew on in a horizontal fashion for another 50 feet, shiver me timbers, and then fell from t' air, landin' hard on one side, me hearties, with an audible thud. Avast, ya bilge rat, me proud beauty! I am sure t' ejection charge must have fired but t' nose cone be jammed on and did nay eject. At impact t' nose cone shattered into a number o' pieces, and both fins on t' side o' t' body tube which hit t' ground were mangled. Avast! Avast, me proud beauty! Based on t' way t' nose cone disintegrated I am nay sure it would have even survived under a parachute landing, me hearties, me bucko, clearly a big cone made o' paper and stryofoam is nay t' best solution. Avast!
While this flight be a spectacular disaster for t' Pershing, arrr, it should live t' fly again. Aye aye! I be never really happy with t' shape o' t' nose cone anyway so now I have a good reason t' start over. Aye aye! Next time I am usin' balsa. Ahoy! T' fins will be a quick repair. Arrr! Ya scallywag! T' bigger question is how t' ensure that both motors ignite, as this rocket needs t' power. Blimey! So far in me rocket career I have about a 50% success rate on cluster ignition usin' Estes igniters and an Estes launch controller. Begad! Arrr! Does anyone have suggestions on how t' ensure cluster ignition without carryin' a car battery around?
This will be described after t' model is flown. Still nothin' t' add here since t' chutes never had a chance!
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Hans "Chris" Michielssen (October 6, 2011)
Wow! A great job on a true scratch model. I'm going to start saving peanut cans.