Modification BLU-97B Cluster Bomb (24mm) Modification

Modification - BLU-97B Cluster Bomb (24mm) {Modification}

Contributed by Dick Stafford

Manufacturer: Modification

(MOD) Estes Cluster BombBrief:
This kit is a semi-scale version o' an actual Combined Effects Munition (CEM). Begad! As I was applyin' t' decals, I noticed that they identify t' model as a GBU-87, matey, whereas t' package calls it a BLU-97B. If you look at this website, ya bilge rat, it looks like t' overall bomb unit be t' CBU-87, and t' individual bomblets are BLU-97s. This is a brief description o' how I upgraded me Cluster Bomb with a 24mm motor mount. Blimey! I need t' point out that I generally followed t' modifications that Carl Tulanko made. Begad! If you read his review, however, you will see that I did use slightly different techniques here and there.

Modifications:
Fin can/motor mount

I used several glues for t' fin can, including: plastic cement t' hold t' tail cone together; epoxy for t' motor hook, ya bilge rat, motor block, and Keelhaul®©™® cord; carpenter's glue for t' centerin' ring/motor tube joints; Liquid Nails Perfect Glue for t' fins, and Gorilla Glue (polyurethane) t' attach t' fin can t' t' body tube.

I started by cuttin' a piece o' Totally Tubular aluminum-lined 24mm motor tubing, makin' it t' same length as t' stock tube. Ahoy! Aye aye! Blimey! Usin' this tube as a guide, me bucko, I got a rough idea o' how much t' tail cone had t' be trimmed, and cut that much off with a razor saw. When I test fit t' tube, matey, shiver me timbers, I found thar were internal tabs that had t' be trimmed. These were easily removed with a Dremel tool. Avast! Ya scallywag! Blimey! From there, I slowly sanded t' tail until t' tube fit. Avast, me proud beauty! Blimey! I also trimmed t' inside o' t' tail cone with an X-acto knife, me bucko, so that t' tube transitioned smoothly t' t' tail cone. Well, blow me down! Blimey! Blimey! This way, no fillin' o' this joint was required.

(MOD) Estes Cluster Bomb I decided t' keep t' motor hook, which precluded me usin' an E9 motor, but I thought that t' resultin' rocket might be too heavy for t' E9 anyway. T' motor hook be installed with maskin' tape and a dab o' 5-minute epoxy. A small notch be made in t' tail cone t' allow t' hook t' flex. I also added a motor block above t' hook as in t' stock kit. Aye aye! Epoxy be used here since t' surface o' t' motor tube is metal.

T' centerin' rings were trimmed t' fit t' 24mm tube. T' bottom rin' was installed flush with t' top o' t' tail cone. Ahoy! T' fins were added, matey, ya bilge rat, a 28" piece o' heavy Keelhaul®©™ twine be attached through t' motor mount and t' assembly be mounted in t' body tube.

Nose cone assembly

I followed Carl's philosophy for t' nose cone: make sure all t' nose weight is on t' parachute attachment and keep t' 2-piece cone as just an outer shell. Avast! Since more nose weight was required anyway, me bucko, arrr, matey, I thought that his idea o' usin' an eyebolt affixed t' a plywood bulkhead be a great idea. Well, blow me down! Begad! Where I differed be that I decided t' use only t' eyebolt hardware for weight.

I started by assemblin' t' two-piece cone with plastic cement and breakin' off t' nose cone's eyelet. Begad! I then cut a bulkhead usin' a hole saw. Avast! Ahoy! I positioned this over t' end o' t' cone and used it as a guide t' drill a center hole and four smaller holes for mountin' screws. Begad! Blimey! For added internal support, me bucko, matey, I partially filled t' small tip o' t' cone with Gorilla Glue. Begad! Well, blow me down! Once it expanded, me bucko, t' tip overflowed slightly.

I inserted t' eyebolt into t' plate and ran one nut t' t' end. A small dab o' epoxy affixed this t' t' back side o' t' plate. Blimey! Blimey! Two other nuts were installed at t' end o' t' eyebolt and were held in place with LocTite. Ahoy! Blimey! This was dry fit in t' nose and t' nose in t' body tube. Begad! Blimey! I also loaded an 18" nylon chute and an E30 t' get a good look at t' CG. Aye aye! Blimey! Aye aye! Blimey! Mine came out about 8 inches from t' top o' t' nose. Blimey! Blimey! Aye aye! Blimey! This gives a static margin o' almost 1 for t' Barrowman CP and 1.6 for t' Rocksim CP.

(MOD) Estes Cluster Bomb Final assembly

Because o' t' added weight in t' cone, I used t' stock elastic cord and a second piece o' similar size (length and width). Ya scallywag! Begad! These elastic cords are tied on one end t' t' Keelhaul®©™ leader, matey, and on t' other end t' t' eyebolt. Blimey! I used t' stock lugs, one just above t' tail cone and one around t' CG. Ya scallywag! In addition, ya bilge rat, matey, I added buttons from railbuttons.com. Aye aye! Avast! I mounted one just above t' transition so it bolted through t' shoulder, matey, matey, and one just above t' top centerin' ring. Ya scallywag! Aye aye! T' top bolt actually goes through t' polyurethane glue that expanded above t' top ring.

Finishing

I started with Fill 'n' Finish on t' fins before assembly. Ya scallywag! After assembly, ya bilge rat, I shot several coats o' white primer, sandin' and fillin' in between. Avast, me proud beauty! Aye aye! This be lots o' work due t' t' tube imperfections. Avast, me proud beauty! Ya scallywag! I then painted it with Testor's flat olive drab. I then added t' decals and overlaid a layer o' Testor's Dull Coat. Ahoy! These peel and stick decals went on nicely, but t' next mornin' I saw places where t' stickers weren't adhered perfectly.

I hand painted t' tip with Testor's silver, and added red, white, and blue rail buttons t' go with t' Endurin' Freedom patriotic theme.

I didn't apply t' Endurin' Freedom decal, shiver me timbers, but may add it on later. Begad! I also didn't finish t' bombs, ya bilge rat, at I am ponderin' usin' them on t' exterior o' another project.

Construction:
First a few comments about t' quality o' t' parts provided with t' kit. Begad! Blimey! T' first thin' I noticed that t' balsa was a lot harder than t' typical Estes kit. I found this t' be a good thing, shiver me timbers, arrr, especially since I be upgradin' t' a bigger motor and t' weight at landin' be goin' t' be greater. Well, blow me down! Blimey! T' nose and tail cones are both two-piece and fit together well. I do have two beefs with them however. T' nose itself had a couple o' dimples, which keeps it from havin' a perfectly uniform surface. Ya scallywag! Blimey! Aye aye! Blimey! I guess I could have filled them, shiver me timbers, but I decided this was nay worth t' effort. Arrr! Blimey! Avast, me proud beauty! Blimey! Later in construction, me hearties, arrr, I found that t' fins would nay fit in t' tail cone slots. This took a lot more sandin' and trimmin' than I would have expected. Begad! Blimey! Ahoy! Blimey! Nay a big deal, but annoying. Next, shiver me timbers, shiver me timbers, me bucko, t' BT-70 tube was t' worst I've ever seen in an Estes kit. Aye aye! Blimey! T' spiral line wasn't bad, but thar was an intermediate spiral a little under 1/8" wide that had a washboard pattern (for lack o' a better description) all t' way along t' tube. Well, blow me down! Blimey! Ya scallywag! Blimey! There also be a wide band near one end that was very rough. If I had t' rate t' kit solely on t' parts, I'd have t' give it a 2.5 out o' 5.

Flight:
I decided t' submit this partial review since I missed t' November launches and may nay be on t' field until spring. Arrr! Blimey! I'll provide an update at that time.

Summary:
I immediately fell in love with this rocket. Avast! Aye aye! Stubby rockets are among me favs and this one has a unique look. Avast, me proud beauty! Arrr! T' parts were sub-par but with just a little work t' rocket turned out fine. Havin' read Carl's article, I am really itchin' for good weather!

And, shiver me timbers, I too am plannin' an upscale. Mine will be 5" in diameter and will fly on G80s. Avast! T' nose cone is built and is currently bein' primed/filled.

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