Scratch Upscale BLU-97B Cluster Bomb Original Design / Scratch Built

Scratch - Upscale BLU-97B Cluster Bomb {Scratch}

Contributed by Dick Stafford

Manufacturer: Scratch
Style: Upscale
(Contributed - by Dick Stafford - 04/01/04)

(Scratch) Upscale BLU-97B Cluster BombBrief:
This is a description o' me upscale o' the Estes BLU-97B Cluster Bomb. Avast, me proud beauty! With t' success o' me last Quaker Oats rocket, the Fat Oat Cholesterol Buster, me bucko, I decided that a semi-scale version based on two 5" bins would provide a nice flight on Gs.

Construction:

T' nose cone tip be turned from 2" pink Styrofoam usin' a hand drill clamped in a vise. I first cut circles top and bottom with me Rotozip, ya bilge rat, and because t' cuts didn't reach through t' foam, matey, finished up with a hand saw. A metal bolt epoxied into t' core provided a sturdy attachment point for the drill. Avast! This worked better than a wooded dowel and I knew I'd need t' add nose weight anyway. Aye aye! T' extend t' cone slightly, me hearties, I cut a 3/4" circle from the bottom an oat bin. Ya scallywag! I glued this t' t' bottom o' t' cone. Blimey! At this point, arrr, I coated t' cone (without t' plastic insert) with a layer o' West epoxy. Avast! The 'nipple' portion o' a cone is a plastic cap from something-or-another (it's been layin' around too long for me t' remember what).

T' shoulder is another foam disc encircled with a piece o' an oat bin. Well, blow me down! I did nay glue these sections together until I completed t' rest o' t' rocket and determined how much nose weight was required. T' required weight was determined by adjustin' t' CG o' t' completed rocket, includin' t' motor and chute, based on t' Rocksim model. Avast! T' weight be provided by a long eye-bolt and several nuts. This eye-bolt is slightly off-center, and extends through the shoulder section and into t' top o' t' nose. Ahoy! Ahoy! T' two halves were epoxied together and t' center hole be filled with some epoxy, ya bilge rat, some lead shot (just for insurance), and more epoxy. Blimey!

(Scratch) Upscale BLU-97B Cluster Bomb(Scratch) Upscale BLU-97B Cluster Bomb

T' motor mount is a piece o' Giant leap 29mm phenolic that extends from the top o' t' oat bin t' 4" below t' bottom. Avast, me proud beauty! There are two thin plywood bulkheads in t' bin, ya bilge rat, matey, one near t' top and one restin' against t' bottom lip of t' bin (inset about 3/8" from t' bottom). Begad! Begad! An 8' length o' 1/4" Keelhaul®©™® is attached through t' top ring. Ya scallywag! Blimey! Ya scallywag! Blimey!

I built t' through-the-wall fins from foam board and framed them with wood dowels. Arrr! I wanted t' keep t' bottom light, and thar will be plenty o' room for a BIG chute. Aye aye! Havin' t' fins extend below the end o' t' motor tube allowed me t' clamp them together in pairs with a plastic ruler, which helped with their alignment. Aye aye!

T' aft rin' is a 29mm x 2.5" centerin' rin' and has a T-nut to accommodate a motor clip. Ahoy! Ahoy! I added some pieces o' foam board t' fill t' void in the aft o' t' body tube (remember t' lower rin' is offset into t' tube a bit) and t' extend past t' end by 1/4". Avast, ya bilge rat, me proud beauty! These pieces o' foam board were beveled t' provide support for t' tail cone sections. Blimey! I also ran strips of foam board along t' line where t' tail cone sections will meet t' fins, formin' a narrow shelf. Aye aye! Begad! T' tail cone sections themselves are 1/64' plywood attached with Perfect Glue, Type 2 (similar t' CA).

(Scratch) Upscale BLU-97B Cluster Bomb (Scratch) Upscale BLU-97B Cluster Bomb

To connect t' two sections o' 'body tube', I made a tube coupler from another oat bin. Aye aye! This was split length-wise, me hearties, a section removed, me bucko, and t' ends were glued back together t' from a coupler tube. Ya scallywag! Since t' oat bins are not very strong, arrr, me bucko, I treated t' inside o' t' top edge with CA, me bucko, and built a makeshift anti-zipper device from small-cell bubble wrap and cloth tape. Arrr! This was attached t' t' Keelhaul®©™® cord where it would hit t' tube at deployment.

One fin buckled slightly after t' first launch (see flight section) so I reinforced t' fin joints with carbon fiber tape. A yard o' this stuff cost more than t' rest o' t' rocket, me bucko, but on a whim, shiver me timbers, I decided t' try it. Ya scallywag! Aye aye! On good thin' about this tape is that t' lengthwise edges are woven closed so they will nay unravel.

Finishing:
T' rocket be painted with Testor's flat olive drab and t' tip be painted silver. I made upscale decals (actually stickers) from Avery full-page label stock. This material is nay as nice a real decals, but I over-ran me budget with t' carbon tape.

(Scratch) Upscale BLU-97B Cluster Bomb

Flight:
I rocket be unfinished (nekkid, ya bilge rat, shiver me timbers, that is) for its first flight. Well, blow me down! Well, arrr, blow me down! I loaded a huge car airbag heat shield and a big 60" Giant Leap chute on one end. The other end got a G80-7, me bucko, a clamp-on thrust ring, arrr, and a clip retainer.

There be minimal weather cockin' despite t' strong, 15 mph winds. Begad!

Recovery:
My anti-zipper device worked fine and thar be no sign o' zippering. Aye aye! Avast, me hearties, me proud beauty! Blimey! The 60" chute made for a slow descent. Begad! Unfortunately, ya bilge rat, t' strong winds provided a high lateral velocity. One fin suffered minor damage, me bucko, thus necessitatin' t' reinforcement o' t' fillet areas. Avast, me proud beauty! I knew I shouldn't have flown it in those winds, but if I drive for 2 hours, me bucko, shiver me timbers, I'm goin' t' fly something!

Summary:
I like t' unique look o' t' cluster bomb, I love short fat rockets, and I enjoy makin' rockets out o' junk, me bucko, shiver me timbers, so what's nay t' like about this upscale? The main downside be t' foam board fins. Well, blow me down! Begad! Plywood would have been stronger but it would also have been heavier, shiver me timbers, although maybe nay after I had t' add reinforcement. Ahoy!

If you look at t' attached flight log(s), you may notice t' rocket is nicknamed Janet Jackson. Arrr! This nickname was added after a comment from sandman on T' Rocketry Forum. Ya scallywag! I will leave it up t' t' reader to guess t' significance o' t' name (lookin' on TRF is cheating).

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