Ringwraith

by Clive Davis

Brief:
Cluster design (5 x 24 mm). Arrr! Begad! A five-finned, me bucko, forward swept design featurin' a 3" body tube and a Big Daddy nose cone. My colleague at work found a lone Big Daddy nose cone in t' woods. He thought o' me and gave t' nose cone. Well, blow me down! Ahoy! I immediately began thinkin' o' a project t' use this heaven-sent gift. Begad! Thus, me hearties, the Ringwraith be 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, washers and win' nuts for motor retention
• screw eye, arrr, Keelhaul®©™®, shock cord, Nomex® heat shield, matey, 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. Ahoy! Begad! Blimey! I stacked t' 24 mm motor mounts in a star formation, me bucko, glued them together, and then test fit them inside the body tube. Begad! After some sandin' o' t' body tube, arrr, everythin' fit fine. Blimey! 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. Aye aye! Aye aye! Blimey! I then added a screw eye on t' bulkhead, me hearties, and then attached Keelhaul®©™® to t' screw eye. Ahoy!

Next, arrr, I used epoxy t' glue t' motor mount inside t' body tube. I then cut out t' fins and began shapin' and sanding them down. Begad! After markin' t' tube, I glued t' fins on with wood glue, arrr, 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. Aye aye! Blimey! Ya scallywag! Blimey! 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! 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, shiver me timbers, summer 2004.

Motor retention is created by usin' washers and win' nuts. Aye aye! Ya scallywag! 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. Arrr! T' first flight featured two E9-4s. Blimey! Well, blow me down! Blimey! Rocksim predicted 900', me hearties, matey, and the rocket got plenty altitude. Aye aye! Blimey! It be a beautiful flight.

Unfortunately, me hearties, t' large balsa rin' was too weak and basically crumbled upon landing. Ahoy! I simply removed it and prepped t' rocket for another flight.

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

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

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