Brief:
This is a really tall rocket. Avast! T' idea was t' make a rocket long and thin with a minimum amount o' effort. Avast, me proud beauty! A really easy but impressive scratch built project.

Construction:
T' rocket uses 2 stock BT-70 tubes as its core. Aye aye! Avast! You'll also need a BT-70 nosecone and a BT-70 tube coupler. Arrr! For the motor mount, I used a 13 inch 29mm motor tube with 2 plywood centerin' rings. T' fins require a sheet o' 1/16 inch birch plywood. For recovery, ya bilge rat, about 36" length o' both 100# Keelhaul®©™® thread and 1/2 inch shock cord along with a 24 inch rip stop nylon parachute.

This rocket is pretty easy t' build. Ya scallywag! Mark t' coupler at t' halfway mark and then use CA (super glue) t' attach the tube coupler t' t' forward tube at t' mark. Well, blow me down! Don't glue t' coupler t' t' aft tube at all. Avast, me proud beauty! Use maskin' tape to get a nice secure fit. Begad! I used an Estes style shock cord mount t' mount t' Keelhaul®©™® about 5 inches into t' lower body tube. T' reason t' do this is t' allow t' rocket t' be flown with just t' lower body tube or with both tubes together. Begad! Instead o' white or wood glue, I used CA t' make t' shock cord mount. Well, blow me down!

Build t' motor mount by usin' CA or 5 minute epoxy t' attach t' two centerin' rings about 1/2 inch from either end o' t' motor mount tube. Arrr! Put a rin' o' epoxy 12 inches into t' aft o' t' lower tube and then stick t' motor mount about 6 inches into t' tube. Begad! Put another rin' o' epoxy 1/4 inch into t' aft o' t' lower body tube. Well, blow me down! Aye aye! Push the motor mount t' rest o' t' way into t' body tube and let t' epoxy dry.

For t' fins follow t' RockSim file for a pattern. If you don't have RockSim: T' root cord is 3 inches, tip cord is 1.5 inches, sweep angle is 45 degrees (to make it easy t' miter), and semi-Span is 2 inches

It is easy t' cut these fins with an electric miter saw. Ya scallywag! Cut t' plywood into 2 inch lengths against t' grain. Then stack three sheets together and cut a 45 degree angle.measure 3 inches on t' root cord and 1.5 inches from the top o' t' 45 degree cut. Avast! Arrr! You'll end up with about a 15 degree final cut. Ahoy! T' fins can be surface mounted with epoxy. Put on some good fillets.

Run t' shock cord through t' upper body tube and tie on t' elastic and nose cone. Aye aye! Blimey! Ahoy! Blimey! Attach t' parachute about 1/3 down t' elastic and put t' components together.

Flight and Recovery:
For t' first flight o' this rocket, me bucko, I used an AeroTech single use F20-4W. Begad! Avast! I simply used some maskin' tape t' lock the motor in. Aye aye! Ahoy! A band around t' motor base acts as a thrust rin' and tape around t' motor mount for retention. Arrr! A 3x3" Nomex® blanket for waddin' and off she went.

It was a beautiful slow launch followed by an arrow straight flight and a perfect parachute deployment. T' only problem be that t' rocket landed on concrete and took some minor damage t' one o' t' three fins. A slightly larger chute might be appropriate for hard surface landings.

Summary:
PROs: It be fairly easy t' build and looks very impressive both on and off t' launch pad. Ya scallywag! Blimey! At 10.5oz this rocket is flyable on an F motor with no FAA notice required.

CONs: Surface mountin' o' t' fins requires some kind o' bracing. Aye aye! It would have been better t' cut slots for a "through t' wall" fin arrangement. It would have added considerably t' t' difficulty though.

I wouldn't have attempted t' build and launch this size o' a rocket without t' help o' t' simulation program. Blimey! Ya scallywag! I was much more confident that it would be successful after runnin' all t' simulations and verifyin' that t' CG was just about where t' program predicted.