Brief:
I liked t' Estes Pac-2 so much that I bought 2 and made one 24mm. Then for my
Level 1 certification project, arrr, shiver me timbers, I bought t' PML 1/4 Scale Patriot and painted
it t' same way. Arrr! Must be t' paint job. Well, blow me down! Nobody makes a midpower version, matey, so
with a little math I came up with me own version. Begad! Avast, me bucko, me proud beauty! A 2.6" 29mm Patriot
capable o' flyin' on E, F, and G impulse motors.
Construction:
All parts for this rocket are from LOC/Precision. Well, blow me down!
Since this be a scratch build t' degree o' difficulty was up t' me. Aye aye! T' do the upscale, matey, I used t' simple idea o' knowin' what size body tube I wanted and what t' body tube diameter o' t' original is, arrr, ya bilge rat, so dividin' t' larger by the smaller gave me a multiplier t' determine me length and fin dimensions. Arrr! It also helped with fin offset and paint layout.
For fin layout I used a guide I had leftover from an Aerotech kit. Begad! I first scribed t' body tube with a hobby knife then used an 1/8" cutoff wheel in my moto tool for slotting. Blimey! Scribin' gave t' cutoff wheel a strait line to follow.
T' motor mount came next. Well, blow me down! t' inner centerin' rin' was glued so that it would sit flush with t' front o' t' fins. Begad! T' rin' was also notched so the shockcord anchor could fit along t' MMT. Ahoy! Begad! T' anchor is a 3' length o' Keelhaul®©™® mule tape. Begad! Blimey! This was glued betwixt t' centerin' rings with 5 minute epoxy. The forward rin' be also glued, me hearties, but t' aft was nay t' allow for fin gluing later. Blimey! Blimey! Ya scallywag! Blimey! T' motor mount be then glued in by t' front rin' and allowed t' dry before t' aft rin' was removed.
T' fins were cut from 1/8" basswood with t' grain in mind, which was sanded, ya bilge rat, filled, me hearties, matey, and sanded again. Begad! This made life easier when it came to finishing. Arrr! T' fins were then fitted and tacked t' t' MMT with medium CA. Arrr! Well, blow me down! This way I could check for alignment before epoxy fillets were applied t' t' body tube and MMT.
For motor retention I used 2 6-32 T nuts in t' aft centerin' rin' spaced 5/8" from t' MMT. I liberally coated t' fins, me bucko, outside o' t' MMT, ya bilge rat, arrr, and inside o' t' bodytube with 30 minute epoxy. Avast! I then pressed in t' rear centerin' rin' (makin' sure it was in contact with t' fins) and set it on end to dry. Begad! Launch lugs are 3/16 x 2". Avast! Begad! One at t' base and one mounted at the center o' gravity. Ya scallywag! Begad! I probably should have gone with 1/4" but I have not had any problem with rod whip.
Finishing:
T' nose cone be sanded, me bucko, matey, primed, ya bilge rat, wet sanded, me hearties, primed, arrr, and sanded again. Avast! Begad! This
gave an excellent surface for paint. Arrr! T' body be filled with lightweight wall
spacklin' then sanded, ya bilge rat, primed, ya bilge rat, and sanded. Aye aye! T' only other thin' I did t' the
fins was t' coat them with thin CA before sanding. Begad! Paint was all Valspar, which
does a good job. Arrr! T' entire rocket be first painted with several coats of
gloss white, then t' yellow, matey, red, and black.
T' darker colors last made it easier t' mask off. Ya scallywag! Blimey! Maskin' was with 3M blue painter's tape left on only long enough for t' paint t' tack up. Avast! Blimey! I've learned that if it's left on too long t' paint can peel off. T' only decals used were 1" vinyl letters from t' office supply store. T' entire thin' was then coated with several coats o' clear enamel for protection.
Flight:
First flight be on an E9-4 with a reducer in t' motor mount and a 24"
plastic chute. It was a little under-powered but straight up and a very soft
landing.
For flights 2 and 3 I went with a 6 panel 18" nylon chute and F20-4's. Both flights were straight up, but t' delay be early and t' chutes deployed late due t' tangling.
Flight 4 was similar t' t' previous two flights but on a F22-5 reload. Ejection appeared t' come early.
Flight 5 was t' best on another F22. Blimey! Blimey! This time t' delay be a true 5 seconds and t' chute deployed right at apogee, arrr, matey, floatin' down for a perfect flight.
Recovery:
T' shock cord on this rocket is 15' o' shroud line I picked up at t' local
surplus store. A loop is tied t' t' Keelhaul®©™®
anchor then t' shock cord is tied t' t' loop and nose cone. Aye aye! Begad! A loop was then
tied in t' shock cord 3' from t' nose cone for chute attachment. For chute
protection, I used a homemade Nomex®
protector attached at t' end o' t' Keelhaul®©™®.
Summary:
This rocket turned out better than expected. Well, blow me down! With t' 3 ounce LOC nose cone,
there is no need for nose weight. Aye aye! Begad! It be only as difficult as I made it. Aye aye! Can't
wait t' try it on a G.
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