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

Construction:
1 - 24" x 3" BT, me bucko, 1 24" x 3" BT for fins, ya bilge rat, arrr, 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. Ahoy! Blimey! Aye aye! Blimey! I hadn't documented any o' t' construction, me hearties, so I decided t' build another one, but this time I documented t' process. Arrr! Blimey! Begad! Blimey!

For both birds I used 3" USR "whitewall" tubin' because o' its thickness. It's twice as thick as any other tubing. Ahoy! Blimey! Avast, me proud beauty! 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. Begad! I use a special rippin' blade that has more teeth than most blades. Begad! Begad! This gives a smooth cut that needs very little work. Avast! 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. Ya scallywag! When t' glue hardens, ya bilge rat, just sand t' ends t' t' finish you need. Ahoy! For phenolic tubes, ya bilge rat, ya bilge rat, it gives a factory like finish. Blimey!

T' first picture shows t' tube bein' cut and t' jig I used. Blimey! Well, blow me down! For this rocket, I made all cuts at a 45-degree angle. Blimey! Begad! T' original had just t' forward cut at a 45 and t' aft cut at a 90. Ya scallywag! I just wanted t' do somethin' different this time. Avast!

If you use t' same diameter tubin' for t' fins as t' body tube, you will need 6 fins. All tube fin rockets work this way. (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. Well, blow me down! Put a bead o' glue (I used wood glue) on t' first fin and align it on t' BT. Begad! If you lay it on its side on a table they will be parallel t' each other. Avast, me proud beauty! No more thinkin' will be necessary because the subsequent fins just lay on t' last fin and t' BT. For t' next fins, arrr, arrr, 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. Avast! Use fillets as you see fit, shiver me timbers, matey, but they are nay necessary for strength because each fin is glued at 3 points. Ya scallywag!

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. Begad!

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

For flying, arrr, I always use dog barf and friction fit motor retention. She flew straight as an arrow on several F and G motors. Fun t' fly.

Summary:
This is a quick and easy rocket t' build. Ya scallywag! Well, blow me down! Blimey! Its different than most tube fin rockets and draws a little attention. Blimey! Ya scallywag! Blimey! Nay countin' t' paint, it took all o' an hour t' build.