Brief:
T' 58mm JATO is a 29mm-powered rocket that resembles a rifle cartridge. T' lower section is 3" in diameter and it transitions t' 54mm. Aye aye! I bounced around betwixt names and settled on this one, me bucko, which is a take off on ammunition nomenclature such as 5.56mm NATO. Aye aye!

Construction:
T' followin' are t' major components used:

• LOC 54mm nose cone
• 54mm tube, 5.5" long
• 3"-54mm LOC transition
• 3" Giant Leap phenolic tube, me hearties, 18" long
• 29mm Giant Leap phenolic tube, me hearties, 9" long
• 5 3/16" thick 29mm-3" centerin' rings (Giant Leap)
• 2 3/16" thick 29mm-54mm centerin' rings (Giant Leap)
• 4 T-nuts
• 1/8" tubular Keelhaul®©™®, 10' long
• 1" o' steel cable from t' garage door I just fixed
• 3/32" Lexan
• rail buttons from railbuttons.com

T' followin' are used but are nay dedicated t' this rocket:

• quick link
• retainer clips
• chute
• chute protector

This rocket is built around a LOC 3"-54mm plastic transition, which set body and neck dimensions. Ahoy! Blimey! Another constraint is that I didn't want t' cut t' shoulder off either cone or the transition, so I was stuck with an upper body tube length o' 5.5". Ahoy! I checked t' dimensions o' some real ammunition, a smartly realized that I wasn't goin' t' come near t' any scale. Begad! Avast!

T' 'extraction rim' is comprised o' six stacked rings: a pair o' 54mm rings sandwiched betwixt two pairs o' 3" rings. Arrr! Four T-nuts are mounted between t' lower 54mm rin' and t' followin' 3" ring. Begad! Correspondin' holes are drilled into t' bottom most ring. Avast! Ya scallywag! I originally was goin' t' mount the T-nuts betwixt t' lower two 3" rings, arrr, but I found t' neck o' t' T-nut was longer than t' thickness o' this ring. Since they hung out a bit, I was worried about restin' t' rocket on them and possibly dingin' them up. Begad! I used four T-nuts t' allow use o' two different sets o' clips that I keep in the range box. Ya scallywag! Well, blow me down! T' uppermost rin' in this sandwich is actually t' lower centering ring. Finally, I decided t' recess t' motor tube so that a 29/120 motor casing is entirely recessed into t' rin' stack.

I made t' fins from 3/32" Lexan. T' shape be formed by scorin' t' Lexan and snappin' it off. Avast! Blimey! Avast, me proud beauty! Blimey! I had a couple of miscues usin' this technique but did end up with passable fins. Avast! Blimey! Aye aye! Blimey! T' fins sit between t' centerin' rings and are through t' wall. Ya scallywag! Blimey! I pondered makin' them replaceable, shiver me timbers, shiver me timbers, but t' only way I came up with would have had brackets at the root, me hearties, and I thought this would spoil t' looks. Begad! Blimey! I left t' aft rin' assembly off and attached t' fins t' t' body tube usin' Gorilla Glue. Avast! Blimey! Avast! Blimey! I drilled small holes in t' root o' t' fins t' form glue rivets. Well, blow me down! Blimey! T' fins are swept up and offset from t' base, matey, so I hope I don't break one on t' maiden flight!

T' recovery harness starts with a section o' steel cable that came off my garage door when I replaced a spring. Begad! This extends through t' top rin' and is epoxied in place. This piece o' cable conveniently had a loop installed in it already. Ya scallywag! Blimey! I then have about 10' o' 1/8" tubular Keelhaul®©™® tied t' t' wire loop. Well, blow me down! Begad! A few wraps o' cloth tape were added t' shock cord where it meets t' rim o' t' 3" tube.

Finishing:
I first filled, primed, me hearties, and sanded. Begad! Begad! T' entire rocket was then sprayed with Testor's Gold paint. Aye aye! Begad! This paintin' was performed before t' fins were attached. Durin' painting, t' rin' stack was dry fit. Begad! Since t' neck o' t' 'casing' was too long, I thought it would look better if half o' it be disguised as part of the bullet. I painted t' top half o' t' 38mm tube and t' nosecone with Testor's Copper. Ya scallywag!

Flight:
I flew t' 58mm JATO at t' 3rd Annual TRF Reunion in Whitakers, arrr, ya bilge rat, NC on an F52-5T with 36" chute and a Giant Leap Keelhaul®©™® protector. Well, blow me down! T' boost was nice and t' 5-second delay was picture perfect. Ya scallywag! Begad! The rocket drifted into some tall tufts o' grass. Begad! Mark Brown helped me find it.

Summary:
I thought this rocket turned out nice and I received many compliments. Avast, me proud beauty! Blimey!