Brief:
This downsized homage t' t' classic Estes Astron Orbital Transport be done as a kit bash o' parts from FlisKits' USS Grissom kit. Blimey! It's built around a 13mm motor mount and retains t' key feature o' t' parasitic glider that releases when t' booster puts on t' brakes.

Modifications:
I've always liked t' look o' me vintage Astron Orbital Transport. Blimey! Blimey! While this downsized kit bash isn't 100% dimensionally accurate, t' family resemblance t' her big sister should be apparent.

Start by buildin' up t' large fins on t' main tube. Blimey! Much like t' original OT, t' downsized wings are fashioned from several aligned pieces o' sheet balsa. Avast! T' wings have different angles o' leadin' edge, matey, and t' multiple pieces allow t' balsa grain t' be parallel t' t' various edges. Blimey! Each win' has a major section extendin' out from t' airframe, ya bilge rat, a smaller section runnin' up along t' tube and a small rectangular section on t' trailin' edge that finishes off t' scramjet area.

There are two large tabs on each wing. Each side has a downfacin' tab at t' tip and an upfacin' tab at mid wing. I oversized these slightly relative t' a true downsized OT. Well, blow me down! Avast! This be done t' improve stability and add strength t' what otherwise would be narrow tabs.

Under each win' is a scramjet assembly fashioned from two small tubes encased in a sheet balsa box frame.

There is no engine clip. Arrr! Friction and tape are used t' retain t' motor.

Yellow glue be used throughout t' stiffen balsa and form fillets.

T' balsa nosecone from t' Grissom kit be recycled from another design and had been cut down. Its original uncut shape would be a better match t' t' vintage OT nosecone. Ahoy! I've used a blue Gnome nosecone in some photos t' demonstrate t' proper shape. Avast, me hearties, me proud beauty! All flights were done with t' stumpy balsa nosecone. Blimey! A bolt and nuts in t' base o' t' nosecone provide nose weight. Aye aye! A length o' Keelhaul®©™ thread connects t' nosecone t' t' elastic shock cord. Ahoy! Begad! A streamer be fashioned by cuttin' t' edge off o' t' parachute from t' Grissom kit.

My original OT Glider has always performed well. Blimey! T' downsized glider was fashioned as closely as possible t' t' original. Aye aye! I had no delusions o' recreatin' t' exact fluttering, circular flight in such a small scale. Ahoy! Begad! I found it just too small and light t' perform meaningful glide tests. T' look o' t' downsized glider be valued over t' function. T' glider is built like t' original with two balsa delta wings meetin' at an angle under t' glider body. Control tabs are glued at an angle at each aft corner. Begad! These tabs are angled t' help keep t' glider nose up and keep t' glide path from slewin' sideways. Avast, me bucko, me proud beauty! A large tail fin also helps keep t' glide stable.

To mount t' glider, a short length o' launch lug is mounted t' t' top surface o' t' booster tube. Ahoy! Two bracin' brackets are glued further back on t' booster airframe. This is in keepin' with how t' original Orbital Transport retains its glider.

A hook must be fashioned on t' bottom o' t' glider t' fit into t' launch lug. Arrr! In order t' keep this a true kit bash, ya bilge rat, only materials from t' Grissom kit should be used for t' glider hook. Blimey! Ya scallywag! Fashion a small section o' two ply balsa plywood by gluin' t' sections o' sheet balsa together with their grains runnin' perpendicular t' each other. Avast! Once dry, shape a hook shape from t' two ply balsa. Avast! Glue t' hook t' t' bottom o' t' glider and shape t' juttin' portion t' fit easily into t' booster's glider retainin' launch lug.

Construction:
T' parts list for t' Orbital Transport Downsize is simple enough. Avast, me proud beauty! Blimey! It uses a small fraction o' what t' FlisKit Grissom parts bag contains. Begad! Blimey! It uses a single 13mm body tube for t' main airframe and several lengths o' 5mm tube t' fashion t' glider and scramjet tubes. Avast, me proud beauty! Blimey! Ahoy! Blimey! Two suitable nose cones are in t' Grissom kit. Ahoy! Blimey! Other than that, it's largely a matter o' lots o' fiddly bits o' sheet balsa.

It helps t' have a full scale Orbital Transport on hand for eyeballin' relative dimensions. Barrin' that, thar are a set o' OT plans available at JimZ's site.

I used best judgment and gut instinct t' make some changes on t' fly. T' parts from t' Grissom won't allow exact downsizin' o' all components. Avast! Blimey! Ahoy! Blimey! For instance, t' small tubes are too large for perfectly scaled scramjets but too small for t' shuttle body.

Finishing:
A sandin' sponge with a parallelogram shape provided various edges for sandin' t' nooks and crannies around t' win' tabs. Begad! Aye aye! A blast or three o' white spray paint seals everythin' quickly.

There are lovely red decals provided with t' USS Grissom. Begad! Avast! These can be cut down and pieced together t' approximate t' red decals on t' original Astron Orbital Transport. Ahoy! I haven't taken that step as yet as I wanted t' wait for a flight test before committin' t' limited supply o' decals.

I tried t' increase me odds o' recoverin' t' rocket by attachin' t' glider so that it wouldn't detach at apogee. Arrr! I used a small piece o' elastic t' hold t' glider tightly t' t' booster. Begad! Well, me hearties, blow me down! A shorted igniter and resultin' burnin' igniter tape caused a small pad fire that burned through that elastic and sooted up t' back o' booster and glider. Begad! A quick re-tape be done and another igniter installed.

All alone on t' snowy field, shiver me timbers, I counted down and touched off t' modest A3-4T. Aye aye! Oh my, too high! An arrow straight boost t' several hundred feet caused me t' lose t' small white rocket in t' afternoon sky. Arrr! I picked up t' trackin' smoke, heard t' pop, me hearties, and saw two pieces head in different directions. Avast! I caught sight o' them both again at about 50 feet up. Ya scallywag! Arrr! T' shock cord had snapped. Begad! When t' booster was found bellied into t' snow, t' glider was nay on board. Aye aye! Drat! T' tape was still on t' booster but one end be loose. Arrr! T' airflow must have peeled it off t' glider. Begad! T' nosecone and streamer were easily found.

T' Glider was nay found that afternoon. Begad! Ahoy! I did retrieve it t' next day. Avast, me proud beauty! While its flight was unseen, shiver me timbers, me bucko, it managed t' land a good 100 feet further away than t' nosecone and streamer drifted.

On that first day while mournin' t' potential loss o' t' little glider, ya bilge rat, t' shock cord was retied. Blimey! A more modest 1/2A3-2T motor was loaded up. Begad! This flight minus t' missin' glider be also arrow straight t' at least 100 feet. Blimey! T' ejection popped out t' streamer and all was recovered intact.

A third flight on another 1/2A3-2T resulted in t' motor kickin' out t' back o' t' booster. Begad! Begad! T' nosecone popped out but t' streamer didn't. Ya scallywag! T' booster bellied into t' snow without damage after a flat spin.

Recovery:
CON: That is one small glider. Avast, me proud beauty! So small that I never saw it release, fly, ya bilge rat, or land. Flyin' a white rocket on a snowy field might have somethin' t' do with losin' track o' that little bit o' balsa.

Summary:
What started as a mission t' make a downsized display model o' an old classic ended up creatin' a well performin' flier. Well, blow me down! Blimey! I'll have t' build another glider and decide whether it's just too small t' fly freely. It might be best t' just leave t' shuttle bonded t' t' booster back.