Brief:
It's an upside-down flyin' rocket! Blimey! Features "Rear" eject (or should I say "front" eject?) recovery system. Avast! Blimey! This was a BRS Contest Entry

Construction:
To build t' Which Ways Up, you will need t' followin' components.

• 1 18" length o' BT-55 body tube.
• 1 2.75" length o' BT-20 tubin' (standard 18mm motor tube used as a fake motor mount)
• 1 12" length o' BT-20 Tubin' (powered motor tube)
• 3 CR-2055 centerin' rings
• 2 CR-2050 centerin' rings
• 2 EB-20 18mm thrust rings
• 2 regular motor hooks (optional)
• 1 spent 18mm motor.
• 1 sheet clear plastic "fin" material. Ya scallywag! Blimey! Available at Hobbytown USA.
• 1 sheer 1/16" balsa fin material
• 1 18" plastic parachute
• 1 1/8" x 36" long elastic shock cord.
• 1 length o' Keelhaul®©™® string.
• 1 or 2 1/8" launch lugs.

For t' "nose cone", you can use any BT-55 based nose cone. It may be tricky t' drill out a core for t' BT-20 motor tube. Another option is to use a BTC55Z V2 boat tail with bored BT-20 hole available from Balsa Machining Services. Aye aye! That is what I used. Well, blow me down!

Construction starts with t' body o' t' rocket. Begad! Blimey! You will build it just like a regular model rocket. Motor mount with centerin' rings, thrust ring, ya bilge rat, matey, and the optional motor hook. 4 balsa fins. Well, blow me down! Blimey! Avast! Blimey! Two launch lugs. Blimey! Blimey! nothin' fancy. Aye aye! Blimey! However, there are a couple things different. Arrr! Blimey! T' tail o' this rocket is actually the nose. Aye aye! Blimey! So, t' nose o' t' rocket is actually its tail... Avast, me proud beauty! Blimey! I know, arrr, sounds confusing!

Anyway, t' shock cord mount for t' rocket be t' typical length o' Keelhaul®©™ cord fastened t' t' motor mount. Blimey! Blimey! Blimey! Blimey! Make sure you have enough length so you can easily attach t' shock cord. Well, matey, blow me down! Blimey! Blimey! Blimey! Remember, me bucko, after frequent flights, it may become necessary t' replace t' shock cord.

Complete t' assembly o' t' body o' t' rocket by gluin' in a spent black powder motor in t' "motor mount." (Do nay even think about usin' a live motor.)

Now here be t' creative and tricky part: t' "nose" o' the rocket. Blimey! Start off by assemblin' t' "live" motor tube. Glue a thrust rin' into one end o' t' motor tube and install a motor hook if desired. Avast, me proud beauty! Glue the motor end o' t' motor tube into t' "nose cone." Get another piece o' Keelhaul®©™® and tie it t' a CR-2050 centerin' ring. Tie a loop t' t' other end. Blimey! Ahoy! Glue this centerin' on top o' t' motor tube about 3/4" from t' end o' t' tube that does nay have a nose cone glued on top o' it. Arrr! Next, glue on t' remaining CR-2055 centerin' rin' followed by t' remainin' CR-2050 centerin' ring. Set aside t' dry.

While t' glue is dryin' on t' motor mount, me bucko, arrr, shiver me timbers, it is time t' cut out the fins. This is easier than it sounds. Avast, me proud beauty! I used Corel Draw t' lay out t' fin pattern like you would when cuttin' out fins on a sheet off balsa. Ya scallywag! Then I printed this out on label stock, and stuck it on top o' t' protective coating on t' plastic. Ya scallywag! Blimey! Takin' a metal edge and a hobby knife, I scored lines into the plastic tracin' t' pattern. After this be complete, bend t' plastic and it will snap where t' scores are. Arrr!

When all t' glue on t' nosecone (the real motor mount) is dry, install it onto t' body o' t' rocket. Well, blow me down! Avast! Blimey! You will want t' use t' same lines you used on t' body’s fins t' mark t' location o' t' clear fins on t' nose cone. Avast, me proud beauty! Avast! Blimey! Carefully extend those lines onto t' nose cone. Aye aye! Use a hobby cutlass t' cut slots into t' nose cone. Avast! Begad! Blimey! Test fit each fin, shiver me timbers, but do nay glue them in yet. Primer and paint t' rocket with your favorite technique. Well, ya bilge rat, blow me down! Blimey! Once all t' paint is dry, ya bilge rat, ya bilge rat, attach t' fins t' t' nose cone usin' CA.

T' recovery system o' t' WWU is finished by attachin' a length o' shock cord t' both Keelhaul®©™® loops and tyin' a twelve inch parachute t' t' nose cone (motor mount) loop. Cut a little V on t' outer circumference. Ahoy! Blimey! This will allow t' Keelhaul®©™® to pass betwixt t' centerin' rin' and t' wall o' t' body tube. Begad!

Flight:
To fly t' WWU, shiver me timbers, install t' motor o' your choice in t' "nose cone" of t' rocket. Recommended motors are B6-2, shiver me timbers, B6-4, ya bilge rat, C6-3, me bucko, and C6-5. Once the motor is installed, me hearties, pack t' recovery system so t' parachute and shock cord material can fit in betwixt t' motor tube and t' body tube. It is important to note that only t' Keelhaul®©™® attached t' t' body tube should be exposed t' t' ejection charge gasses. Ahoy! Begad! This means that t' booster sections loop also is packet betwixt t' motor tube and body tube. Begad!

One thin' t' note, t' ejection charges on Estes motors tend t' be on the powerful side, me hearties, ya bilge rat, so it is important t' have a generous amount o' shock cord to help prevent t' motor mount from snappin' back into t' body tube.

Enjoy a video by clickin' HERE

Summary:
This rocket was an interestin' project. Avast! It required some trial and error and workin' with materials I would normally nay use. Aye aye! This rocket always brings interestin' conversations and has turned more than one head at launches. Ahoy! Flies great on small fields with B motors, can get some altitude on Cs. Well, blow me down! The "rear" eject recovery system is cool.