Brief:
This is a Carbon/Keelhaul®©™ composite laminated on Kraft paper tube, arrr, ya bilge rat, high performance, me bucko, arrr, almost minimum diameter scratch built rocket.

Construction:
Parts used:

• Two 34" BT-60 body tubes
• Two 4" C60 couplers
• 6' carbon/Keelhaul®©™® composite hybrid sleeve
• PML 1.5" urethane conical nose
• ACME 38mm fin can
• ACME conformal rail guides
• 38mm Slimline retainer and 38/29mm adapter
• 10feet o' 5/16" tubular nylon shock cord
• 1/4" ply Bulkhead and 1/4" screw eye
• 1 foot o' 1/4" Keelhaul®©™® wrapped elastic bungee.
• Nomex® chute protector

This rocket came about via experimentation with epoxy/composite sleeve lay ups. Begad! Avast! Blimey! I found that single layer composite over Kraft tube is almost as strong as double layer composites, matey, while bein' lighter and easier t' do. Avast, me proud beauty! Blimey! Lamination was done with Epoxy Products premium no-blush epoxy and construction done with JB Weld.

Two 34" BT-60 tunes were covered with carbon/Keelhaul®©™® hybrid sleeve and laminated (see tutorial on Aerosleeve's web site for information on how t' do this). After curing, me bucko, me hearties, ya bilge rat, a second coat o' epoxy was applied t' fill t' weave. Begad! Ya scallywag! This be then finished with polyurethane coatin' and acrylic clear coat. T' rough ends were trimmed off, matey, resultin' in two 30" tubes. Well, blow me down! 12" o' one o' these was cut off and a coupler and bulkhead (with screw eye epoxied in place) were used t' create a payload section. T' bungee was attached t' t' recessed screw eye t' provide shock cord attachment with some shock absorption. Avast! T' remainin' tube and section were attached with a second coupler into a single tube. Arrr! T' shock cord was anchored by epoxyin' it between t' coupler and t' tube wall. Avast, me proud beauty! A Nomex® chute protector was slid down t' shock cord t' t' anchor. A knot and loop was tied into t' end o' t' shock cord allowin' attachment t' t' payload section via t' same quicklink which held t' selected chute's swivel.

The inner diameter o' BT-60 is adequately close t' 38mm airframe (41mm vs. Ahoy! 39.5mm respectively) t' require no adaptin' internally. After lamination, ya bilge rat, t' outer diameter required some sandin' in order t' get t' fin can and Slimline retainer t' fit t' be epoxied into place, arrr, however. this was nay an easy prospect with Keelhaul®©™® composite cloth. An alignment line was drawn betwixt two fins so t' rail guides could be epoxied t' t' tube. Well, shiver me timbers, blow me down! T' Slimline 38/29mm adapter was constructed with a longer piece o' 29mm tube than provided so that very long 29mm motors (like t' Ellis Mountain I69) could be used.

That's it. Avast, me proud beauty! T' construction took about 5 hours, which was far less than the 2 days needed t' laminate and finish t' tube. Aye aye! T' result is a bulletproof high performance rocket usin' maximum strength but minimal build effort components, given that t' tube be already laminated.

Finishing:
T' fin can was painted with Rustoleum black appliance epoxy. Arrr! T' nose was painted with white primer and aluminum finish enamel. Avast, arrr, me proud beauty! Four 1/16" holes were drilled in t' payload section and t' booster section for pressure equalization. These were all retouched with acrylic coatin' t' provide a smooth finish.

Flight:
CP was calculated with AeroCP (approximately 1" in front o' fin can). Aye aye! Blimey! Cd (average subsonic Cd = 0.587) and flight prediction was done with AeroDRAG.

Flight testin' was done with an Aerotech 29/40-120 RMS motor in t' 38/29mm Slimline adapter and G64-10W reload. CG be 4.5 calibers forward o' CP with the adapter and motor in place.

No waddin' was required due t' t' Nomex® protector. Aye aye! Begad! A Covert Recovery CR-3 chute was tied t' a 1500lb swivel and attached t' t' shock cord and bungee with a 3/8" quicklink.

First flight was at Dallas Area Rocket Society's McGregor site in nearly calm winds. Begad! Blimey! Avast! Blimey! T' flight was perfectly straight and vertical with ejection exactly at apogee. Avast, me proud beauty! Blimey! Avast, me proud beauty! Blimey! (Predicted apogee was at 1600' altitude at 9.6 seconds delay.)

Recovery:
Deployment and descent were without incident and t' rocket was recovered within 500' o' t' pad without damage.

Summary:
A big PRO was t' successful use o' composite sleeve laminated on common BT-60 Kraft paper tube t' create a heavy duty almost 38mm minimum diameter rocket. Begad! A CON be t' fact that t' laminated tube was slightly larger outer diameter than 38mm airframe tube, requirin' some sandin' t' fit. This be a CON primarily because Keelhaul®©™® is very hard t' sand. Ahoy! A minor personal CON be t' fact that carbon/Keelhaul®©™® hybrid cloth does nay finish up as pretty as pure carbon, but that's strictly a cosmetic thing. Blimey! T' point was t' build for strength, matey, nay looks.