Scratch USS Moebius Original Design / Scratch Built

Scratch - USS Moebius {Scratch}

Contributed by Todd Mullin

Manufacturer: Scratch

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I loved EMRR's new "Spaceship Design Contest", but in t' beginning, I wasn't excited by any o' t' designs. Aye aye! Avast! But, shiver me timbers, over t' weeks that followed, arrr, I rotated t' pictures on me desktop wallpaper and studied each for a few days and finally settled on this design. Avast! I thought that t' outboard motors would be an interestin' challenge that I had nay tried before. Aye aye! Avast! This design reminds me o' t' look o' t' ships o' Star Trek, arrr, though somewhat "lower tech" looking. Begad! Probably around t' time o' t' "Enterprise" series and an early Star Fleet tug or supply ship from its looks. Avast, me proud beauty! Workin' with that line o' thought, as many o' t' ships in t' Star Trek universe are named after famous scientists and scholars, shiver me timbers, I decided t' name this rocket t' USS Moebius.

I started out t' design process by firin' up me handy-dandy copy o' Rocksim. Ahoy! I got t' basic model built and lookin' pretty good, I thought. However, thar was one little problem... Rocksim said it was totally unstable even with several ounces o' nose weight! At this point, I decided t' go ahead and build t' rocket that, me hearties, with me many years o' experience, shiver me timbers, I was pretty sure would be stable.

I decided that I would use an old Estes Fat Boy nose cone that I had kickin' around after me last Fat Boy lost it's match with gravity. Ahoy! This provided t' scale for t' design and t' rest was scaled t' look proportional t' t' picture. I decided t' keep t' design as simple as possible and pop t' nose cone on each nacelle instead o' tryin' t' passport t' ejection charge t' push out t' main nose cone. Begad! Arrr! Due t' t' naggin' feelin' in t' back o' me head created by Rocksim, arrr, I decided t' go with 13mm motors instead o' t' larger 18mm t' cut back t' weight on t' tail end as much as possible.

Right side

This rocket provided me with an interestin' new challenge as well. Ahoy! Arrr! T' get t' nose cones for t' nacelles t' look right, ya bilge rat, I would either need t' use a BT-5 stuffer tube inside o' t' BT-20 nacelles t' get t' correct look, or try t' turn t' cones. Well, blow me down! I up until this point had been highly intimidated by t' though o' tryin' t' turn cones for myself. Avast! For some reason, t' process seemed much more dauntin' than it actually (if you'll pardon t' pun) "turned" out t' be! I cut a chunk o' balsa t' 1"x1"x1" and CA'd a piece o' hard wood dowel into one end. I chucked this into me drill after it cured and locked t' drill in t' "on" position. I let t' drill rest on t' ground and held t' dowel as it turned (I'd recommend gloves for this...friction burns are nasty...) and used some 80 grit paper t' slowly round t' balsa into shape. T' first one came out amazingly perfect! I was floored! T' came t' harder part.... Ahoy! Makin' three more that were identical.... Begad! Heady with me initial success, it took a couple extras t' get four that were suitably close enough for use. Avast, me proud beauty! If you have nay tried this because it seems t' "scary", me hearties, me hearties, give it a shot. T' process is reasonalby simple t' grasp, shiver me timbers, but it is definitely an artform. Ahoy! Give it a little practice and it is really rewarding!

I also had t' turn t' tailcone for t' Moebius as well. Ya scallywag! This was somewhat easier as I be able t' trim t' diameter o' t' balsa t' match t' tube before I started turning. Blimey! Ahoy! After turning, me hearties, I glued t' cone flush without it havin' a shoulder. Aye aye! Ahoy! It seems t' be sturdy enough t' survive without t' extra weight that t' shoulder would have added.

Tall

T' rest o' t' build be fairly straight forward. I tacked t' fins t' t' nacelles with CA and Tite-bond, me bucko, filletin' after t' root bond had cured. I eyeballed t' alignment o' t' fins onto t' main airframe since me fin alignment guide wouldn't fit under t' outboard pods, usin' t' same gluin' technique. I finished up where I normally start, shiver me timbers, buildin' and insertin' t' mini-motor mounts into t' pods.

At this point, ya bilge rat, arrr, I decided it would be a good time for a swin' test t' make sure that I was goin' t' have a rocket t' flew in straight lines instead o' loops! With a couple o' ounces o' sand glued into t' front o' t' Fat Boy cone, matey, t' rocket seemed stable enough for flight! Nice t' see that I haven't lost me eye for stability, arrr, even though t' software said otherwise....

I took a page from t' Master o' t' Dark Art o' Rocketry, Shrox, me bucko, t' add t' details t' t' nose...Pin' pong balls! I cut t' ends off a couple o' balls, arrr, as a full half o' a ball was much too large for t' look o' t' design. Well, blow me down! I had a couple o' old Alpha III cones in me parts box, so I halved them and trimmed them down t' about a third o' t' length so that they would match up nicely with t' pin' pong balls. Avast! Aye aye! Gluin' these t' t' airframe helped disguise t' seam betwixt t' body and t' nose somewhat.

I filled t' seams with Elmer's Fill-n-finish, sanded and primed with Kilz and sanded again. Aye aye! T' tailcone got a coat o' Rust-o-leum Metallic Blue and t' airframe got a coat o' gloss grey. Avast! After maskin' t' grey stripes, I sprayed t' whole model with Rust-o-leum Metallic Black. Begad! T' design for t' contest had a bit o' a pixelated pattern t' t' lighter grey areas, ya bilge rat, so I laid a piece o' loose weave fiberglass over t' grey areas and sprayed them with t' metallic black t' give them a little bit o' t' texture from t' image.

Back side

T' day o' t' launch, I had decided t' nay tempt t' wrath o' t' Rocket Gods and didn't want t' fly t' rocket in it's finished paint. It flew in primer only... Aye aye! Pretty rockets make ugly flights!

My initial flight was on 4 A10-3T's. Blimey! Avast, shiver me timbers, me proud beauty! I loaded t' motors up and installed t' igniters with and borrowed a whipclip from a buddy. All four motors lid and it jumped into t' sky perfectly thanks t' t' high initial thrust spike o' t' A10's. Ahoy! Blimey! All four nosecones popped in series, ya bilge rat, matey, much t' t' delight o' several children who were lookin' on. Aye aye! I had installed two streamers and a parachute, me bucko, leavin' one o' t' cones t' just pop. This brought t' model down reasonably quickly, but with no damage as t' flight be nay very high and our launch field here in San Diego is sand.

Lift-offI waited until another day t' get me additional flight in. Avast, me proud beauty! Begad! Both me second and third flights were near disasters. Blimey! Only 2 or 3 o' t' 4 motor lit on these flights. Avast, me proud beauty! With t' reduction in thrust, t' model be terribly underpowered, barely clearin' t' rod on t' 2 motor burn. Aye aye! At this point, I had burned through most o' me supply o' A10-3t's, so I loaded only two on t' next flight as well as 2 A-10PT's! This one lit perfectly, but seemed t' nay fly quite as high as t' first flight had. Arrr! After another failled flight, with this motor combination, I switched t' me final flight configuration, me hearties, 2 A10-3T's and 2 A3-4T's. Avast! Luckily, ya bilge rat, as these were t' last mini-motors that were left in me flight box, shiver me timbers, all t' motors lit. Ahoy! This combination was again underpowered. My thought had been that it would get more altitude because o' t' longer burn o' t' A3's, but without t' initial thrust spike from 4 A10's, arrr, t' flight barely ejected before impact.

I enjoyed t' experience o' buildin' this rocket because o' t' challenge o' it's outboard cluster and havin' t' learn t' new skill o' turnin' cones. Arrr! Avast! Overall a very satisfyin' experience. Begad! I am goin' t' continue flyin' t' Meobius after t' contest, me bucko, but in a modified configuration. Aye aye! Avast, me proud beauty! I am goin' t' glue in t' nacelle nose cones. Lightin' all 4 motors is more o' a challenge than I would rather deal with every time I want t' fly it. Ahoy! Since t' tail cone is only surface glued t' t' end o' t' main airframe, shiver me timbers, it should be easy t' remove. I'm goin' t' install a central 24mm motor mount that will aft eject, me hearties, as t' nose details are glued securly over t' seam at t' front, makin' a standard ejection impossible.

 

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