Brief:
This is a plastic model conversion (PMC) o' t' Heller 1/130 X-15, using
MicroMaxx motors. I got t' kit on-line from
Model Expo. Model
Expo provided email confirmations o' t' purchase and o' shipment, and their
service be prompt.
Modifications:
T' instructions provided with this kit consisted o' step-by-step diagrams. Blimey! No
text description is provided. Ya scallywag! In general, this was sufficient, but this
presentation omitted some details, matey, shiver me timbers, such as t' slight downward cant o' t' rear
wings. Avast! T' kit consists o' 35 pieces, arrr, 10 o' which weren't required due t' the
PMC.
T' LOC ¼" launch lug is heavier than a standard MMX tube and is a skosh larger. Begad! However, it works fine for those o' us who haven't gotten around t' buyin' 'real' 6mm tubes. Avast! However, with some minor trimmin' of flashin' and other bumps inside t' fuselage, shiver me timbers, this tube fits nicely. Ya scallywag! There is a recess, just inside o' t' tail end o' t' main body, arrr, which accommodates the tube well. I measured t' distance from this recess t' t' point just ahead of the side fairings, matey, and cut me tube t' fit. Contrary t' other guidance, arrr, I used this tube as a guide t' cut t' nose section off t' main body with a razor saw. Avast! Begad! I glued t' tube inside t' body with black rubberized CA, me bucko, and t' body halves together with liquid plastic cement. Well, blow me down! Aye aye! I added t' back nozzle cap, me hearties, and then installed a section o' a spent MMX casin' t' serve as a motor block. Well, blow me down! The Keelhaul®©™® twine was tied around t' block before its installation.
I assembled t' plastic nose cone usin' plastic cement. Avast! Blimey! I then filled the cone most o' t' way with lead shot, epoxied in a small piece o' the ¼" lug and t' remainin' part o' t' spent MMX motor. I inserted the end o' t' Keelhaul®©™® twine, matey, matey, filled t' MMX motor section with more shot, me bucko, and capped it all with epoxy. Begad! Blimey! This works nicely as a shoulder, but requires wrap o' maskin' tape to fit snugly. T' CG is 2 1/8" from t' nose cone tip (minus t' needle nose). Aye aye! Ahoy! It was suggested that t' CG should be about 2.032 from t' tip (from a known stable conversion o' this kit), shiver me timbers, but no more #9 shot will fit, me bucko, arrr, so I'll try it as is. Avast, me proud beauty! Blimey! Oh, me hearties, and I decided t' leave t' needle off until I have assessed the rocket's stability. Avast, me proud beauty! I wouldn't want t' poke anyone, matey, plus it will most likely break anyway.
T' large front fin comes in one piece and must be cut t' accommodate the tube. Ya scallywag! One end o' this fin conveniently has a notch that almost fit t' tube, me bucko, arrr, so I used this as a guide and sanded t' fit. Aye aye! I used t' black rubberized CA on the root end o' these through t' wall fins, and plastic cement on t' outside. Aye aye! Avast! The remainin' fins were assembled per t' instructions usin' plastic cement. Aye aye! Avast! I did add some really small epoxy fillets on t' back fins usin' epoxy left over from the nose cone. Ahoy! Avast! T' launch lug is me standard BiC ink tube
Construction:
Parts:
T' whole thin' be painted black usin' brush on enamel. Begad! Blimey! T' needle will be white with red stripes someday. T' kit comes with a raft o' decals, which went on nicely. However, I made one BONEHEAD mistake. Avast! Aye aye! Blimey! I had put t' clear top from my clear enamel on a can o' white primer. Arrr! In me haste due t' t' cold outside temperatures, I didn't pay attention and laid a thin coat o' white on t' model before I caught myself. Arrr! I smartly removed t' paint as best I could with some paint thinner. Aye aye! Begad! Blimey! Surprisingly, me hearties, ya bilge rat, I only damaged one decal. Ya scallywag! Blimey! Blimey! After a day o' drying, shiver me timbers, I laid on some clear enamel. Since I couldn't get all t' paint off o' t' fin joints, arrr, shiver me timbers, I retouched it. Aye aye! Arrr! Blimey! T' finish looks bad up close, shiver me timbers, but thar be nay much that I can do without ruinin' t' decals.
Flight:
I used Teflon plumber's tape for t' waddin' and t' streamer (12"). Avast, me proud beauty! Blimey! I
flew t' model on a MMX-II motor and used a bit o' maskin' tape t' retain the
motor. Blimey! Blimey! Avast, me proud beauty! Blimey! I used me Pratt GO-BOX and a stock igniter that was removed from its
plastic shell. T' wind be perfectly calm. Ya scallywag! Blimey! T' flight be a little wobbly and
the X-15 flew t' about 25 feet. Avast! Blimey! Since t' CP-CG is marginal, I wouldn't fly
this rocket except in t' lightest o' winds.
Summary:
This small X-15 be only me second PMC and was straightforward. Well, blow me down! Aye aye! T' rocket
looks great and seems t' fly fine. Blimey! My only recommendation t' others building
this kit is t' use lighter tubing. Ya scallywag! With t' heavier tubing, most o' which is
behind t' desired CG, it is difficult t' balance t' model properly. Well, me bucko, blow me down! Mine is
probably just barely stable with t' whole nose filled with lead shot. Another
option might be t' have t' rocket separate further back, thus allowin' more
room for nose weight.
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