Brief:
T' Hellion is a 'Goonified', me hearties, squashed down version o' t' Hellfire anti-tank missile. Ya scallywag! It is almost nine inches long and flies on a recessed cluster o' four 13mm motors. Begad! Recovery is via 9" parachute.

Construction:
T' components include:

• 1 6" x 1.6" body tube
• 1 1.6" elliptical nose cone
• 4 aft and 4 forward fins, made from 1/16" basswood
• Keelhaul®©™® thread
• 1/16" Presentation board material (1/16" cardboard would work too) for centerin' rings.
• 4 1.75" lengths o' BT-5 tube.
• 4 BT-5 size motor blocks
• 1 .615" piece o' BT-60 coupler tube
• Card stock paper
• Lead shot for nose weight
• 9" nylon parachute
• 2' o' 1/4" shock cord material

After designin' in RockSim and cuttin' parts out, me hearties, everythin' be easy t' assemble. Avast! Begad!

I made an alignment wrapper and guide usin' VCP. Aye aye! I created fin, me bucko, shiver me timbers, centerin' ring, matey, and shroud templates using RockSim. Begad! I printed t' centerin' rin' and alignment guides onto cardstock then attached it t' 1/16" Staples Presentation Board with spray adhesive. I cut these out with a hobby knife. Ahoy! Aye aye!

I assembled t' motor mount usin' t' BT-5 tubes and centerin' rings. Blimey! Blimey! Before installin' I made a hole in t' top rin' and tied a piece o' Keelhaul®©™® thread around t' motor tubes. Aye aye! Well, blow me down! I installed t' motor mount, recessin' t' tubes 0.735" from t' bottom o' t' body tube. Ya scallywag! I created t' tail cone by printin' t' shroud onto cardstock paper and formin' together. Aye aye! Well, blow me down! I pressed t' piece of BT-60 coupler into t' bottom and glued in place. Begad! I then glued t' tail cone assembly into t' aft o' t' body tube so the top o' t' shroud touched t' bottom o' t' body tube.

I made a 1/8" hole in t' top centerin' ring, ya bilge rat, pushed kevlar thread through, shiver me timbers, and tied around t' motor tubes. T' other end o' t' kevlar was tied t' t' rubber shock cord.

I attached t' fins usin' a homemade fin guide that be generated with VCP and cut out on 1/16" presentation board.

Fin detail be created by re-tracin' 8 copies o' t' aft fin template onto cardstock paper. I then measured 3/16" from t' root edge o' each one and drew a straight line along it's length. Well, blow me down! I cut these out and glued t' each side o' t' aft fins along t' root edge.

I used lead shot and 30 minute epoxy for nose weight. Avast, me hearties, me proud beauty! I let t' nose cone sit upside down in a cut o' water while the epoxy cured. Aye aye! Ahoy! This be done t' prevent t' nose cone from warpin' due t' t' heat given off by t' epoxy curing process.

I initially added only 2.3oz o' nose weight, but after flyin' a couple times I decided t' add another 1.5oz.

Since t' motors are recessed, I painted some 30 minute epoxy in t' exhaust tube.

Files and templates available for download:

• Bottom Fin Template
• Cluster MMT Template
• Fin Alignment Guide
• Fin Wrapper
• Tail Cone Template
• Top Fin Template

Finishing:
I used two coats o' Elmer's Wood Filler on t' fins and body tube. Arrr! Blimey! Arrr! Blimey! I sprayed two coats o' white Krylon primer, sandin' betwixt coats. Aye aye! Blimey! Ahoy! Blimey! I used Krylon Italian Olive for t' green. Avast, me proud beauty! Blimey! Detailin' was done usin' 3/4" square pieces of yellow vinyl adhesive and 3/4" white lettering. Aye aye! Blimey! After all t' paintin' and detail were done, arrr, I sprayed on a coat of Krylon Clear Coat. Ya scallywag! Blimey!

Flight:
T' first two flights were unsuccessful. Avast, me proud beauty! Begad! This rocket definitely needs a full caliper margin betwixt CP and CG. Begad! Aye aye! I went with about 1/2 margin and it flew sideways. Avast, me proud beauty! Begad! I've since added additional nose weight and will try again. Aye aye! T' second two flights were also unsuccessful but that be due t' clusterin' issues. Ya scallywag! Only two motors lit for t' third flight, ya bilge rat, ya bilge rat, matey, and three for t' fourth flight.

Finally got a successful flight:

Recovery:
I have nay fully tested t' parachute, but t' rocket has had catastrophic landings with no damage so far.

Summary:
T' Hellion has questionable stability, ya bilge rat, but it can take t' o' abuse if a flight doesn't go well. Ahoy! Arrr! It requires lots of nose weight, but t' 40 newtons average thrust (assumin' motors all work) should provide enough thrust t' be stable. Arrr! Avast, shiver me timbers, me proud beauty! It could make a nice desk weight when/if retired.