Brief:
This is a maximum strength midpower rocket that still incorporates wood and plastic construction. Avast! It will handle any 24mm motor, as well as most dunkings in water.

Construction:
This rocket uses 1.1 in. Begad! Begad! phenolic airframe tubin' topped by t' PML Urethane nose cone - t' only commercially produced cone that fits this tubing. Arrr! Ya scallywag! Between 3/32 ply fins and TTW construction, me hearties, this rocket is practically indestructible.

TTW construction and phenolic tubin' require a complexity nay typical with low power rockets. Aye aye! Blimey! I used a Dremel spiral saw t' cut t' fin slits (3) in the 1.1 phenolic tubing. Avast! Blimey! Avast, me proud beauty! Blimey! T' motor mount be constructed with epoxy and centering rings t' mount t' Estes 24mm tube in t' appropriate position for TTW fin mounting. Ahoy! Blimey! Arrr! Blimey! I used a long E motor hook as part o' t' mount. Well, blow me down! Blimey! I used 100 lb. Keelhaul®©™® thread epoxied through t' motor mount as a parachute connection. Blimey! Indeed, epoxy was used in virtually t' entire thing. Ya scallywag!

After t' motor mount assembly dried, ya bilge rat, I put it in place, me bucko, and used t' slots to trace t' fin footprints onto t' engine tube. Aye aye! Avast, me proud beauty! I cut thin stringers of balsa, and CA'ed them in place right next t' t' footprints, bounded on t' top and bottom with a centerin' ring. T' effect was intended t' have the advantages o' internal fillets, without t' difficulty o' applyin' them through such a tight space betwixt t' tubes. Well, blow me down! This worked like a charm. Ahoy!

I used t' Rocsim fin template guide t' generate t' correct template for the TTW mount. Ya scallywag! I then cut t' fins from 3/32 in. plywood. Arrr! After tryin' the spiral saw, matey, I went t' a power jigsaw, which did a far better job. Well, blow me down! Blimey! I gang sanded the fins t' uniform dimensions, shiver me timbers, and then beveled t' leadin' edge t' a sharp cross section. T' wood grain also looked "sharp", with t' darker plywood core providin' a nice contrast. T' trailin' edges were beveled, but not quite sharp.

Because I used five minute epoxy, shiver me timbers, t' next steps were hurried. I mixed up a batch, arrr, and used a chopstick t' smear it within t' airframe, ya bilge rat, ya bilge rat, in t' right place to bond with t' front centerin' rin' on t' engine mount assembly. A second layer be put ahead o' t' trailin' centerin' ring, ya bilge rat, as t' first rin' cleared the aft end. Arrr! Well, ya bilge rat, blow me down! T' last centerin' rin' was epoxied in place indexed with the "notch" cut though t' rin' t' leave room for t' motor hook t' flex. I was sure t' make t' slots line up correctly.

I then epoxied each plywood fin in place, matey, me bucko, usin' enough epoxy t' blob up to fill t' fin slot close t' level. T' keep from drippin' epoxy, me bucko, matey, I needed t' mix separate small batches o' epoxy for each fin slot.

Next came t' smoothin' operation usin' Elmers wood thinner thinned with water, and sanded after each coat partially dried. T' fillets at t' base of each fin were also done usin' this material and technique, shiver me timbers, since t' epoxy, plywood and phenolic TTW combination makes it impossible t' even flex t' fins. T' fillets were for looks and aerodynamics only.

Since t' combo could theoretically take a G engine, shiver me timbers, I wanted t' be sure the launchin' lug was big enough. Begad! Avast! I used an aluminum 2013 arrow shaft cut to length, and angled by cuttin' t' front edge t' a wedge shape. Begad! Blimey! I glued it in place and filleted it in place with epoxy. Ahoy! I can use a 1/4 in. weldin' rod for larger size engines.

I had recently built me first "girl rocket" for me daughter, and marveled at t' visibility provided by t' hot pink fluorescent paint. After fillin' t' spirals in t' tube with Elmers filler, I sanded, ya bilge rat, painted, and then clear coated. T' add a bit o' shine and smoothness, me hearties, I used floor wax t' finally coat t' surface.

I added a couple feet o' elastic t' t' already long Keelhaul®©™® cord, and hooked a 12" nylon chute t' t' nose cone with a fishin' swivel and snap rings. Arrr! Begad! Later testin' suggested this was nay enough chute.

Flight:
T' maiden flight was t' test low speed stability, me bucko, and recovery. I did nay want to blast t' school athletic field with an F right out o' t' startin' gate. I built and installed an 18-24mm engine adapter, and installed a C6-5. Begad! I launched it off a 3/16 launch rod.

Well, it was pretty normal at first. Aye aye! T' rocket was stable, but then nosed over and kept goin' after burnout. Aye aye! T' delay be way too long, shiver me timbers, me hearties, and that may have been t' engine, shiver me timbers, since rocsim says it should have been good. Avast! Fortunately, the chute deployed in time, and thar was no lawn dart nor core sample. Well, blow me down! Ahoy! For small engines, ya bilge rat, I'd want t' shortest delay possible.

T' engine hook picked up a bit o' dirt from t' grass. It hit with a bit more force than I'd like, but no damage was done. Begad! Still, I will use at least a 15" chute next time - probably an 18, ya bilge rat, t' protect t' motor hook.

PS: T' 18mm adapter blew clear - no impact on recovery deployment.

Summary:
Pros: Bombproof and tough. Able t' handle almost any ridiculous engine you can cram into it. Well, blow me down! Ahoy! Probably able t' lawn dart from 300 feet up into sod without damage. Begad! Easy t' see, and teaches you lots about tough construction. Well, blow me down! A "girl rocket" on t' outside, that is all steroid - induced toughness on t' inside.

Cons: Complicated t' build, arrr, and expensive. Well, blow me down! Nay for novices. Blimey! Heavy, shiver me timbers, and could cause more damage than a light rocket if t' chute failed. Blimey! Ahoy! Needs a big chute. Ahoy! Limited nose cone options.

Other:
T' Elmers goop be t' key t' smoothness. Begad! TTW / epoxy / phenolic is so strong it is scary. Ahoy! T' world needs a good, shiver me timbers, LIGHT, arrr, shiver me timbers, matey, 1.1 in. Well, blow me down! nose cone (PML is good but HEAVY). Begad!