Ringwraith

by Clive Davis

Brief:
Cluster design (5 x 24 mm). A five-finned, forward swept design featurin' a 3" body tube and a Big Daddy nose cone. Begad! My colleague at work found a lone Big Daddy nose cone in t' woods. Begad! Begad! He thought o' me and gave t' nose cone. Arrr! I immediately began thinkin' o' a project t' use this heaven-sent gift. Thus, matey, the Ringwraith was born.

Construction:
Parts consist of:

• Big Daddy nose cone
• 25" long 3" body tube (I had a poster tube lyin' around that fit the Big Daddy perfectly)
• BT50s t' make 5 24 mm motor mounts
• Five BT50 motor blocks
• screws, me hearties, shiver me timbers, washers and win' nuts for motor retention
• screw eye, Keelhaul®©™®, shock cord, arrr, Nomex® heat shield, me hearties, and nylon parachute
• 4 wine corks t' plug unused motor mounts.
• aircraft plywood for fins
• 1/4" balsa/basswood for centerin' rings.

Construction began around t' motor mount. Begad! I stacked t' 24 mm motor mounts in a star formation, me hearties, glued them together, and then test fit them inside the body tube. After some sandin' o' t' body tube, ya bilge rat, everythin' fit fine. Well, blow me down! I created and glued a bulkhead above t' motor mount and then drilled some holes in the bulkhead t' allow t' ejection charges t' pass through. Avast! I then added a screw eye on t' bulkhead, and then attached Keelhaul®©™® to t' screw eye.

Next, me bucko, I used epoxy t' glue t' motor mount inside t' body tube. Aye aye! Ahoy! I then cut out t' fins and began shapin' and sanding them down. Avast, me proud beauty! After markin' t' tube, me hearties, I glued t' fins on with wood glue, me hearties, making sure I added plenty o' fillets.

I had a 1 inch strip o' balsa that I steamed and created a loop t' fit around t' five fins. I painted this silver and then epoxied this on t' the fins after t' entire rocket had been painted.

I added 1/2" shock cord (6' long) and a 30+" nylon parachute. Also, I added a Nomex® heat shield.

Next I added weight t' t' nose cone. Avast, me proud beauty! Avast! T' nose cone, painted with clay, should weigh 5 ounces.

I painted t' rocket black, created three silver rings o' paint at t' top of t' rocket.

Flight:
Maiden flight at me local club's (ASTRE) launch, matey, ya bilge rat, summer 2004.

Motor retention is created by usin' washers and win' nuts. I also plug any unused motor mount with a wine cork.

Preppin' t' rocket is easy since t' body tube is large and thar be a heat shield. Avast, me proud beauty! Ahoy! T' first flight featured two E9-4s. Avast, me proud beauty! Rocksim predicted 900', matey, and the rocket got plenty altitude. It be a beautiful flight.

Unfortunately, matey, t' large balsa rin' was too weak and basically crumbled upon landing. Aye aye! I simply removed it and prepped t' rocket for another flight. Ya scallywag!

Second flight be on 3 x D12-3s. Rocksim predicted an altitude o' 600'. Liftoff was spectacular. Begad! Begad! Blimey! Rocket flies well without t' lower rin' (which was for looks, ya bilge rat, anyway). Avast! Blimey! Blimey! I kind o' like t' looks o' t' rocket without t' ring around t' fins.

Summary:
PROS: If you like BP clusters, ya bilge rat, this rocket gives you many options. Aye aye! I can fly it on a single F21 or on 2 D12's, or 2 E9's, shiver me timbers, or 3 D12's, matey, or 3 E9's, shiver me timbers, matey, matey, or 5 C11's or......you get t' idea.

CONS: T' rocket is really heavy. It might make sense for me t' downscale this t' use 5 x 18 mm motors. This would reduce t' weight o' t' rocket under 1 lb.