Semi Scale Model- SpaceShipTwo

I received me box o' parts and was surprised at how much stuff was sent back in comparison t' t' amount I submitted for t' contest. Ya scallywag! Some o' it should have been thrown out ages ago, ya bilge rat, some o' it was good, me hearties, matey, but thar be clearly enough t' build a rocket or two for t' contest. I had me heart set on buildin' a boost glider before seein' t' box o' parts, ya bilge rat, and be a bit disappointed by t' lack o' usable balsa once it came. Arrr! However, ya bilge rat, thar be some balsa included and a nice sheet o' 1/8 inch basswood. Ahoy! Surely, me bucko, I could come up with something. I even contemplated usin' t' box itself for win' or fin material which I usually reserve only for makin' centerin' rings.

(Click t' Enlarge)

There be a time or two where I thought about doin' somethin' sci-fi. Avast! Begad! There were plenty o' rings, me hearties, sticks, wood bits, and plastic doo-dads for that, but it’s nay really me forte. I love when other people do it, me hearties, me bucko, I simply don’t have much experience scratch buildin' that sort o' thing.

Not entirely sure what I wanted t' do now, matey, I stuffed all o' it back into t' box and didn’t think too much about it. After all, matey, we had plenty o' time until t' contest deadline.

I normally spend a week or two buildin' and paintin' a single rocket from start t' finish, then account for any unexpected tweaks t' t' design, me bucko, and t' dreaded written assignment. Begad! A few weeks prior t' t' contest deadline I thought I had better seriously get workin' on this before time ran out. Begad! I decided t' surf t' web t' get some much needed inspiration.

In addition t' gliders, matey, ya bilge rat, I’m also a fan o' flyin' scale models. Blimey! I began searchin' for some scale subjects that may nay have been kitted before or have had little exposure. Avast, me proud beauty! Avast, me proud beauty! Sci-fi is very cool stuff, ya bilge rat, but I figured many o' t' entries might go in that direction, ya bilge rat, and scale would be more o' a rarity for this contest and definitely more up me alley. Durin' me search, I came up with a couple military missiles that looked promising, but t' love for boost gliders kept naggin' at me.

I remembered a discussion I had with Wes Oleszewski o' Dr. Begad! Begad! Zooch Rockets at a recent club launch. Aye aye! We were talkin' about X-Prize rockets. Ya scallywag! Aye aye! At one point in our conversation, I suggested it would be cool t' see a SpaceShipOne kit that wasn’t so heavy as t' Estes kit and could return via glide recovery. Well, blow me down! Ahoy! He raised his eyebrows and thought for a second. With little doubt in his voice he said, "You know, that’s probably possible t' do." That’s all t' endorsement I needed. Avast, ya bilge rat, me proud beauty! He’s a busy man with lots on his plate, me hearties, arrr, and several rockets in queue. Avast! I knew this wasn’t a project he’d be considerin' anytime soon and I didn’t push too hard.

After remember that conversation, I thought this contest might be a good opportunity t' try out me idea. Blimey! I began searchin' for pictures and drawings o' SpaceShipOne on t' internet. Avast, me proud beauty! There is plenty o' scale data out thar for t' X-Prize winner, but t' reality o' what parts I had t' work with be setting… t' nose cone bein' t' biggest obstacle.

Searchin' for data on SpaceShipOne inevitably leads a person t' pics and articles on Virgin Galactic’s, shiver me timbers, SpaceShipTwo. Arrr! Once I saw t' concept art for SpaceShipTwo, I be hooked. Begad! This looked like an even more promisin' design for a boost glider. And, me hearties, I had a plastic BT55 cone in me parts box that could possibly be modified t' suit me needs….or close enough for t' contest’s sake. I downloaded several photos and press images from http://www.virgingalactic.com and started t' process o' scratch building. Blimey! Begad! Blimey! Keep this link handy as you’ll need t' download some o' t' same images I did for your build. Blimey! Blimey! I failed t' make any templates and you’ll see why later.

I began measurin' t' picture and began scalin' for a BT55, since t' PNC-55 cone was t' closest thin' I had without makin' a huge project out o' it. Begad! Blimey! Blimey! I had a chunk o' balsa from a Zooch Saturn rocket which someone so kindly donated. Arrr! Blimey! That cone fits a BT60, but that would require more carvin' and turnin' than me skills would allow. Blimey! Well, blow me down! Blimey! And, arrr, matey, bigger scale meant more wood needed for wings, arrr, arrr, fins, shiver me timbers, etc., shiver me timbers, which somethin' I needed t' be mindful of. Ahoy! Blimey! So, BT55 it was. Begad! Blimey! If me feeble math skills serve me correctly, this is roughly 1/63 scale, and I do mean roughly. Ya scallywag! Begad! Blimey! Let’s call this one "sport scale", shiver me timbers, matey, ok?

Next order o' business be t' scale t' concept art t' 1/63 scale and make printouts. Begad! I did this with Adobe Photoshop Elements usin' t' ruler provided in t' software. Again, nay perfect, me bucko, but sized "close enough" t' match me BT55.

Construction started with t' nose cone. Begad! Blimey! Someone was generous enough t' donate a PNC-55AC. Aye aye! Blimey! Ya scallywag! Blimey! Blimey! Blimey! If you know t' Cherokee D, then you know this cone. Ya scallywag! Blimey! Blimey! Blimey! Blimey! Blimey! It was much too long t' keep it in scale with a BT55, me hearties, matey, so I began hackin' away with me razor saw.

T' cone was cut in half. Blimey! With freehand and a pencil I held t' large portion o' t' cone up t' t' concept art and drew lines like this:

Cuttin' on these lines will allow for a windshield area and begin a more drastic taper t' t' nose.

Here it is after t' lines were cut out:

Usin' Ambroid Pro Weld I fused t' two angled cuts together. Avast, me proud beauty! Aye aye! I used a piece o' tape and t' remainin' portion o' cone t' hold it together while t' cement set.

When t' cement was dry I began trimmin' and sandin' away at t' remainin' portion o' t' cone so it would meet flush with t' new cone transition. Ahoy! Blimey! I also trimmed off about ½ inch from t' very tip. Blimey! Once I was satisfied with t' fit, me hearties, I fused t' pieces together usin' t' Pro Weld again. Blimey! Blimey! It was still too long for actual scale, matey, but much better. Ahoy! Begad! Blimey! I can live with it.

Time for t' windshield. Begad! I wanted a rounded profile on t' windshield so I trimmed and sanded t' top edge so it would curve more. I needed somethin' that would close up t' hole left in t' cone and would form t' curve in t' windshield. Avast, me proud beauty! I finally settled on a piece o' BT55 t' fill t' gap and it already had t' curved profile I needed. Avast, me proud beauty! I held t' edge o' t' tube up t' t' cone and traced t' outline, me hearties, shiver me timbers, then cut it out with t' X-acto.

Usin' plastic safe Plasti-Zap CA I glued t' windshield in place.

While t' glue was dryin' in t' previous steps I took t' time t' make t' vertical booms for SS2 spacecraft. Usin' t' profile view that I obtained through Virgin Galactic, I be able t' make a template directly from t' computer printout. Blimey! I traced it t' me 1/8 sheet o' basswood. T' intention is t' still make this a boost glide so I drew a frame pattern within t' vertical stabilizer, me hearties, shiver me timbers, hopefully reducin' weight after it’s cut out.

I can skin t' fames with t' computer paper that was included with me box o' parts… 3 sheets from a Perfect Flight Altimeter instruction manual, t' be exact. Avast! Layin' out piece o' wax paper underneath o' t' work surface, I put t' frames on top o' t' computer paper and used thin CA around t' edges. Avast! Once t' glue was dry, I cut them loose from t' paper usin' t' wood t' guide me X-acto blade

Once both frames were skinned, shiver me timbers, me hearties, I soaked t' remainin' areas o' paper with thin CA t' help toughen t' paper.

Measurin' t' same computer printout I used for t' vertical stabilizers, I figured on 4 inches for t' body tube t' keep it in me "rough" scale. Blimey! Blimey! Avast, me proud beauty! Blimey! This turned out t' be too short, matey, ya bilge rat, but more on that subject later. Avast, me proud beauty! Blimey! Begad! Blimey! I lucked out and received an 18mm x BT55 motor mount which came completely assembled in me box o' goodies…perfect! Blimey! I removed t' aft centerin' rin' and outside coupler and glued it t' one end o' t' section o' BT55 usin' white glue. Avast! Blimey! No motor hook by t' way, shiver me timbers, this is friction fit, me hearties, baby! Blimey! (looks better for scale and tryin' t' keep weight down t' a minimum)

Now for t' tail cone. Well, blow me down! Blimey! Usin' one o' t' handy software tools found on EMRR, I printed out a template for t' tail cone. Aye aye! Blimey! I used 2.375 for t' length and used t' pre-programmed

tube sizes o' BT20 and BT55. Avast! Blimey! Matt Stum’s handy template widget can be found can be found here: ../../tools.shtml .

I traced t' pattern onto t' lone piece o' cardstock I received. Ya scallywag! Arrr! Cut out, curl, and glue with white glue. Begad! These template generators don’t allow for glue tabs, shiver me timbers, so you’ll have t' make your own.

Slide t' tailcone over t' motor tube so it meets flush with t' BT55, then glue in place with thin CA. Avast, me proud beauty! While I had t' CA handy I coated t' entire tail cone.

T' win' be goin' t' be tricky. Avast! Usin' t' "DNA" picture from t' SS2 press photos, arrr, I created t' wings. T' wingspan from t' printout didn’t quite match t' 5.184" I had previously calculated for. Aye aye! I did a little pushin' and pullin' in Photoshop t' widen t' wingspan while tryin' t' (somewhat) maintain t' aspect ration. Avast! Aye aye! Nay even close t' bein' a perfect match, ya bilge rat, but close enough t' achieve t' desired look o' t' SS2.

Usin' a ruler and me mechanical pencil, I began sketchin' out a frame out onto t' win' printout. I cut several ¼ inch strips o' balsa from t' small scraps o' 3/32" I received. These would be me frame pieces for t' wings. Begad! Blimey! It would have been nice t' cut t' wings from two solid pieces o' balsa, me hearties, but I made do with what be available….same as I did with t' basswood parts. Aye aye! Begad! Usin' t' frame sketch, shiver me timbers, shiver me timbers, I cut all t' pieces t' length which would be needed t' assemble t' wing, matey, me bucko, me bucko, laid a piece a wax paper over t' template and began gluin' t' pieces together with thin CA.

Usin' t' same skinnin' method as described earlier, I papered t' win' assembly. Ahoy! Arrr! I used t' remainin' cardstock t' skin t' bottom.

Usin' a straight edge, me hearties, I drew a line down t' length o' t' main tube and t' center o' t' wing.. Avast, me proud beauty! These lines were used t' help center t' win' on t' tube. I glued t' win' t' t' main tube with wood glue. Well, blow me down! Tacked t' front and aft joints with CA.

Next, shiver me timbers, I glued t' vertical stabilizers t' wings usin' t' profile printout shown here t' help with alignment (this be t' same printout used t' create t' stabilizers earlier).

Usin' t' "DNA" printout used earlier t' make t' wings, me bucko, I made t' four horizontal stabilizers and elevon templates. Ya scallywag! Arrr! They were traced and cut from scraps o' balsa that were included in me parts box. Ya scallywag! Used t' side profile printout again t' help line things up and glue into place…a good eyeball and edge o' a ruler helps too t' make sure t' horizontal stabilizers are perpendicular t' t' vertical stabilizers.

Since this was supposed t' be a glider, ya bilge rat, I made t' elevons seperate from t' wings. Avast! Arrr! I wanted t' elevons and booms t' hinge like t' real deal, usin' a rubber band system(which were included in me box) t' pull them upward at ejection. Avast, me proud beauty! After seein' how far back t' CG already was, I decided against it. Avast! Gettin' a straight boost was goin' t' be tough enough as it was. Arrr! Instead, I glued t' elevons in place and opted for a fixed wing. Arrr! So much for t' glider idea. Aye aye! I still think I took a sizable weight penalty usin' t' basswood, ya bilge rat, paper/cardstock skins and glue, ya bilge rat, matey, but nay sure how much I would have saved goin' all balsa, me hearties, but it certainly didn’t turn out as heavy as it could have been. Avast! Blimey! At one point, shiver me timbers, I thought about usin' t' cardboard mailin' box for win' and stabilizer surfaces, but decided they wouldn’t hold up very well and wouldn’t look as good when finished.

And thar it is…the SS2 glued together and ready for finishing.

It still needed a recovery device. Avast, me proud beauty! Blimey! I installed a piece o' elastic and tri-fold anchor t' t' inside o' t' tube. Blimey! Two pre-made Estes chutes were included in me box, arrr, one 18" and one 24". Blimey! I chose 18" and cut a large spill hole. Blimey! Ya scallywag! Blimey! T' chute is still a bit oversized, shiver me timbers, even with t' spillhole, but will work just fine for t' contest.

And now, a test flight……T' first flight was miserable. Aye aye! Ya scallywag! I had already added several grams o' clay t' t' nose, but obviously nay enough. I flew it on a B6-4 for t' first flight. Begad! Avast, ya bilge rat, me proud beauty! Went up about 50-75 ft., looped a time or two and was still under thrust when it decided t' fly downward. Avast, me proud beauty! Hit t' tall avast and blew t' ejection seconds later. Aye aye! Begad! Surprisingly, me hearties, no damage whatsoever. T' tall avast I had cussed while lookin' for me Scout was now me friend. Arrr! Back t' t' drawin' board.

Clearly, this was still tail heavy and needed t' CG shifted forward a bit. Ya scallywag! Blimey! I achieved this two ways. Blimey! Blimey! Blimey! I wanted t' avoid addin' too much weight t' this, me hearties, so I temporarily taped a 1" length o' body tube t' t' front and added another piece o' clay with a few computer screws added in for good measure. Aye aye! All told, I think thar be about ¾ oz. in t' nose. T' added length is just one more stretch away from t' scale factor, but most o' importantly, me bucko, I wanted this t' fly properly. Heck, arrr, major rocketry vendor take those liberties with scale all t' time. Aye aye! Blimey! In t' name o' nay lettin' all me hard work go t' waste, me hearties, I figured, shiver me timbers, I should too.

No computer Sims here folks, just trial and error…. Begad! Next test flight(#2)….

Success!!!!!

 

  

I’d guess it reached about 400 ft or so on a B6-4, very slight weather cock from t' light breeze that day, but flyin' nice and stable now. Ahoy! Beautiful flight. Time t' finish this puppy!

I used a piece o' t' included computer paper t' fabricate a thin coupler for t' added 1" section o' tubing, me bucko, then CA’d in place.

Fill N Finish on t' few exposed balsa parts, arrr, ya bilge rat, tube spirals, and any visible seams. Avast! Squadron putty on t' nose cone seams and t' blend t' windshield a little better.

Krylon grey primer under Krylon Gloss White, arrr, then masked for t' Krylon Gloss Black usin' Tamiya tape and 3M delicate surface painter’s tape.

Used those little clear plastic paper reinforcement circles t' mask for t' circular windows. Aye aye! Hand painted those and t' windshield area with Testor’s Gloss black, and t' exaust with Testor’s Alminum. Aye aye! Begad! There you have it…. Well, blow me down! t' SpaceShipTwo!

I might print up some decals displayin' t' Virgin logos and such, arrr, usin' me own decal paper when t' contest is over. Avast! That should really make this thin' pop and give it a more scale appearance.

This has been a fun contest and it put me skills t' t' test. Avast! I normally don’t take on too many scratch projects so this was a nice motivator. Aye aye! Thanks for all who contributed in one way or another t' make this contest happen!