Brief:
A simple LPR single stage, motor deployed chute recovered tube fin rocket.

Construction:
1 - 24" x 3" BT, matey, ya bilge rat, ya bilge rat, 1 24" x 3" BT for fins, 1 chute, 29mm MMT and 2 CR's, a nose cone, shock cord and a launch lug.

I was asked t' write a review on me scratch built Circle Jerk. Aye aye! Blimey! I hadn't documented any o' t' construction, so I decided t' build another one, matey, ya bilge rat, but this time I documented t' process.

For both birds I used 3" USR "whitewall" tubin' because o' its thickness. It's twice as thick as any other tubing. Blimey! Ya scallywag! Blimey! I felt that it gives a better appearance t' t' tube fins.

I cut all o' me tubin' with a 12" DeWalt compound miter saw. Blimey! I use a special rippin' blade that has more teeth than most blades. Ahoy! This gives a smooth cut that needs very little work. Avast, matey, me proud beauty! T' softer paper tubes do fray a little but that is solved by soakin' t' ends o' t' tubes with thin Cyanoacrylate or thinned wood glue. Begad! Avast, me hearties, me proud beauty! When t' glue hardens, me bucko, just sand t' ends t' t' finish you need. Begad! For phenolic tubes, it gives a factory like finish. Ahoy! Blimey!

T' first picture shows t' tube bein' cut and t' jig I used. Ahoy! Aye aye! For this rocket, I made all cuts at a 45-degree angle. Avast, me proud beauty! Blimey! T' original had just t' forward cut at a 45 and t' aft cut at a 90. I just wanted t' do somethin' different this time. Ahoy! Blimey!

If you use t' same diameter tubin' for t' fins as t' body tube, matey, you will need 6 fins. Aye aye! Begad! All tube fin rockets work this way. Avast! (Do t' math) Attachin' the fins is elementary. Draw a line around t' tube where you want t' forward tip of t' tube fins t' be. Put a bead o' glue (I used wood glue) on t' first fin and align it on t' BT. Well, blow me down! If you lay it on its side on a table they will be parallel t' each other. Begad! Aye aye! No more thinkin' will be necessary because the subsequent fins just lay on t' last fin and t' BT. For t' next fins, just find where t' tubes touch, draw a line and put t' glue there. T' final fin will snuggle up betwixt t' last fin applied and t' first fin. Well, matey, blow me down! Use fillets as you see fit, me bucko, but they are nay necessary for strength because each fin is glued at 3 points. Avast!

It's tough t' find t' CP on tube fin rockets like this but it's safe to say that its somewhere in t' fin section ;-) Just make sure t' CG is forward of t' fin section with a motor installed. Well, blow me down!

Flight:
For t' original rocket, I used a standard 29 mm motor mount tubes cut t' 6 inches. Ahoy! Avast! T' centerin' rings (2 o' them) were just 5 ply rings I had laying around. Avast! T' 32" parachute and t' shock cord be from a lawn-darted Aerotech Astrobee D. Avast, me proud beauty! T' nosecone is a 3" PML. T' launch lug is just a ¼" Aerotech igniter tube. Arrr! (OK, me hearties, yeah I'm cheap) T' final weight is about 24oz.

For flying, I always use dog barf and friction fit motor retention. Avast, me proud beauty! Arrr! Blimey! She flew straight as an arrow on several F and G motors. Avast, me proud beauty! Fun t' fly.

Summary:
This is a quick and easy rocket t' build. Begad! Its different than most tube fin rockets and draws a little attention. Aye aye! Avast! Nay countin' t' paint, it took all o' an hour t' build.