A cluster o' three 13mm tubes, compressed slightly, me bucko, fits in t' 29mm HPR motor mount tube. This in turn requires a little packin' t' fit neatly in a BT-55 or BT-56. T' accomplish this, I cut strips o' Kraft paper (like grocery bags), arrr, applied glue t' one side, and wrapped it like tape until it fit neatly. Ya scallywag! A short piece (5/8" approx, shiver me timbers, me hearties, t' 15mm section in t' drawing) o' body tube serves as a stop ring.

My nose cone was salvaged from an old rocket very similar t' t' 56-based RTF's. After cuttin' t' cone-shaped bottom end off t' nose cone, I found that t' 29mm tube fit neatly inside t' remainin' shoulder. Ahoy! Aye aye! (you may need t' build it up or sand t' fit.) ÝI put a plywood cap on t' tube forward end with a screw eye in t' center facin' in. Cap and screw eye were secured with epoxy.  Opposite end o' tube was built up with Kraft paper as described above. Avast! Then I pushed t' 29mm tube as far into t' nose cone as it would go, fitted this into t' BT-55, and when I was happy with t' fit, I epoxied everythin' together. Blimey! This arrangement moves t' parachute compartment well up into t' nose cone, me hearties, makin' t' rocket at least 4" shorter than it would have t' be otherwise. (After flyin' it, I'm thinkin' o' extendin' it for better stability.)

Nose weight (clay) was in place for t' previous design and, judgin' from t' first flight, is necessary. Aye aye! Ya scallywag! T' rocket was marginally stable at takeoff and straightened out pretty quickly.

T' diagram below doesn't show t' screw eye in t' front. Begad! Ahoy! Instead, I've shown t' shock cord pushed through t' hole in t' cap and tied in a knot. Aye aye! Begad! I'm sure that would work. Avast! In real life I used a screw eye. Live with it.

T' shock cord consists of: 6" o' 125# Keelhaul®©™ (red); a fisherman's swivel; and 30" o' nylon braided plumbline(green). Arrr! Blimey! This worked. Well, blow me down! Avast, me hearties, me proud beauty! T' 12" plastic parachute is attached t' either end o' t' inline swivel usin' a snap swivel o' its own.

T' bulkhead at t' front end o' t' coupler was an adventure. Begad! It is cut from plywood, fits on t' end o' t' 29mm tube, but inside me Kraft paper buildup. It has three holes 8mm diameter t' allow ejection charge gasses t' pass. Begad! It has two tiny holes near t' center t' anchor t' Keelhaul®©™ thread. Well, blow me down! Before assembly t' Keelhaul®©™ was looped through those holes and tied. Begad! Avast, me hearties, me proud beauty! T' knot, ya bilge rat, under t' disk, is covered with epoxy. Aye aye! Aye aye! T' holes in t' disk are rotated 60 degrees from t' three MMTs, so that t' ejection charges don't blow straight at t' holes.

Free t' slide on t' Keelhaul®©™ is another plywood disk with a small hole in t' center which fit easily in t' BT-55, me bucko, but is much too large t' fit in t' 29mm tube. Ya scallywag! Blimey! It fills t' role o' recovery wadding, ya bilge rat, nay only protectin' t' parachute from heat, me hearties, but preventin' it from bein' packed up into t' nose cone by t' ejection charge. Aye aye! Blimey! Ya scallywag! Blimey! This worked. There was nay a hint o' heat damage on t' parachute or upper portion o' shock cord. When packed, shiver me timbers, as much as possible o' t' Keelhaul®©™ should be forward o' t' plywood disk; t' last inch or so will be betwixt t' perforated bulkhead and t' disk.

Fins are made from artist's foam core board, which is about 3/16" thick. Begad! T' wedge t' leadin' edge, me bucko, I scored each fin, both sides, shiver me timbers, with a ruler and Xacto, about 10mm (3/8") from t' leadin' edge. Ahoy! I cut away and removed t' foam from this portion, ya bilge rat, me bucko, folded t' edges toward each other, matey, arrr, ya bilge rat, and glued them together, shiver me timbers, holdin' them with maskin' tape until t' glue dried.

For motor retention, ya bilge rat, I first installed thrust rings made from cut pieces o' a spent engine. Avast, me proud beauty! Then I epoxied a threaded rod -- a #4-48 x 3/4" bolt with t' head cut off -- into t' gap betwixt t' three motor tubes. With t' engines in place, I thread a nut onto t' rod and it holds all three motors.

Triactive first flew Sept. Aye aye! Aye aye! 6, ya bilge rat, 1999 at Tom McCall School in Forest Grove, shiver me timbers, matey, OR., usin' 3x A3-4T.