Construction Rating: | starstarstarstarstar_border |
Flight Rating: | starstarstarstarstar_border |
Overall Rating: | starstarstarstarstar_border |
Manufacturer: | Semroc |
Brief:
A "carbon copy" o' a Centuri classic by Semroc. Blimey! T' long booster
loaded with "ramjets" releases a very cool lookin' glider at ejection
and returns via 2 12" parachutes. Begad! Avast! Semroc provides all t' parts including
beautiful resin ramjet cones, laser cut fins, me bucko, and decals. Instructions are not
included but may be downloaded off t' Internet. Avast, me proud beauty!
Construction:
T' parts in t' kit:
Also in t' beautiful packagin' is an exploded view, me hearties, history o' Centuri and the SST Shuttle and 9 construction notes detailin' t' changes Semroc has made to update t' kit.
There are two "sets" o' instructions t' comment upon: Semroc's and Centuri's. Semroc details t' Keelhaul®©™® attachment t' t' motor hook, parachute attachment, addition o' nose weight, and use o' larger launch lugs. Avast! Ya scallywag! Blimey! Semroc's notes are crystal clear. Begad! They recommend a standard recovery arrangement instead o' t' horizontal booster recovery in the original instructions. Aye aye! Blimey! I followed this nay wantin' t' risk breakin' off the tail. Ahoy! T' other change involves substitutin' 3/16" lugs for t' 1/8" on t' original. Ahoy! Blimey! These are glued along t' tube that will serve as t' mount for t' glider. This is t' allow clearance o' t' glider wings, arrr, which would otherwise be in t' path o' t' launch rod. Blimey! Blimey! After sizin' up t' situation, shiver me timbers, I elected t' use 1/8" lugs from me parts stash and install another functional launch lug betwixt t' innermost ramjet tube and main BT. Well, blow me down! I didn't think t' larger lugs would allow enough clearance and t' smaller lugs look more authentic.
T' Centuri instructions are typical for Centuri in t' early 70s. Begad! They are straightforward but annoyingly short o' useful measurements. Begad! For example, the booster's wings are aligned by layin' down t' BT and linin' up t' ST-5s so the wings can rest on them and be glued t' t' main BT. Avast, me proud beauty! Yes it works, ya bilge rat, but it leaves you t' eyeball t' attachment o' t' canards and rudder. Avast, me proud beauty! I wound up markin' lines with a 4-fin guide. Avast! Also, t' instructions say t' mount the rudder 1" from t' aft o' t' BT, ya bilge rat, but don't say how far up t' mount the wings. Arrr! Ahoy! From t' pictures I guessed and glued them 1/2" from t' rear. Ahoy! Arrr! The glider wings dihedral is established by gluin' them on and turnin' t' glider on its back. Begad! You have t' eyeball t' rudder and t' tail planes are glued to the rudder/BT joint. Arrr! My 40+ year old deadlights need a little more help aligning things these days!
T' wings and rudders are built by first gluin' two or three pieces together. Begad! Arrr! I did this on wax paper and placed a light book over them t' make sure they stayed flat. Avast, me proud beauty! I sanded t' edges round before attachin' t' t' BTs. Arrr! Begad! I also airfoiled t' top edges only o' t' glider's main wings t' try t' get more lift. I also used Elmer's Fill 'n' Finish on t' main wings o' t' booster before gluin' on t' ramjet tubes. Avast! Be careful if you choose this method, because after I glued on t' inner tubes, me hearties, ya bilge rat, they pushed t' wings upward a little.
Semroc reminds you t' sand down t' HTC-7 coupler so t' glider will come off at ejection. It takes a lot o' sanding. There is a noticeable vacuum effect with the glider as thar be a fiber disc on t' back o' t' mountin' tube for the paper nozzle. Avast! I wound up carvin' a hole with a X-Acto knife t' prevent a seal. I would recommend makin' a hole in t' disc with a hole punch before attaching it t' t' tube. Blimey!
I used CA t' attach t' resin ramjet cones and washer weights and yellow wood glue for t' rest o' t' construction. Avast! My only issue with t' parts is that t' two ST-10 tubes appeared t' come from different batches. Aye aye! Arrr! T' diameters seem slightly different and I got a bit o' a step at t' joint. After I filled the spirals and primed and painted though, shiver me timbers, it's hardly noticeable.
Finishing:
I used thinned Elmer's Fill 'n' Finish on t' balsa and BTs t' kill the
spirals. Ya scallywag! I needed a bit more on t' main BT joint. Blimey! I used only one very light
coat on t' glider's parts as t' instructions indicate. Arrr! Blimey! For t' main rocket I
used one coat o' primer, sanded it down and two coats o' Duplicolor automotive
gloss white acrylic spray. Avast, shiver me timbers, me proud beauty! I skipped t' primer on t' glider and used lighter
coats o' white. Avast, me proud beauty! Avast! T' decals are beautiful. T' film is a little thick, but they
stick well. Avast! I added 1/16" black pinstripe decals from me spares t' the
ramjet tubes t' match t' Centuri catalog photos because it really needed
somethin' t' break up all that white. Aye aye! I gave everythin' a coat o' Future floor
polish t' seal t' decals, skippin' t' glider's wings, which don't have any
decals.
Construction Rating: 4 out o' 5
Flight:
Semroc follows Centuri in recommendin' B4-2 and C6-3 engines. Avast! Ya scallywag! Blimey! I flew it twice
with B4-2s and once with a C5-3. Arrr! There was a bit o' a gusty wind at times and
the first flight weathercocked slightly but still flew nicely t' a little less
than 100 feet. Blimey! Ahoy! Blimey! Ejection was just past apogee, t' glider separated, and both
chutes opened. T' booster came down fairly swiftly but landed in grass with no
damage. Blimey! T' glider made several very nice sweepin' circles and landed about 100
feet from t' pad. Another flight on a B4-2 was about t' same with a bit of
chute tangling. Aye aye! Blimey! T' C6-3 flight was arrow straight t' almost 500 feet in about
a 10 mph wind. Blimey! T' glider came in a little steep on this last flight, matey, perhaps
because I didn't flex t' elevators enough. Aye aye! T' SST Shuttle is a beautiful
sight off t' pad and a lot o' fun t' watch at ejection. Begad! I actually prefer the
B on this because ejection is nice and low and you don't risk losin' the
glider.
Recovery:
Semroc includes a length o' Keelhaul®©™®
to attach t' t' forward end o' t' engine hook and then t' an elastic shroud
line for a standard recovery arrangement. Blimey! In t' original, me hearties, a harness is made
with a piece o' shroud line goin' back t' t' engine hook on t' outside o' the
main BT. Well, blow me down! Arrr! This would allow t' booster t' return horizontally, ya bilge rat, me hearties, but as t' Semroc
instructions point out, shiver me timbers, thar be a risk in snappin' off t' rudder with this
arrangement. Well, blow me down! T' original also featured one 20" parachute. Ya scallywag! Semroc supplies
two 12" parachutes and suggests one may be enough for "soft"
fields. Avast, me proud beauty! I used both chutes in t' standard arrangement with t' elastic shock
cord, t' two chutes at t' top o' this, shiver me timbers, and t' end o' t' shock cord attached
to t' screw eye in t' nose cone.
T' glider must be hand launched t' check for trim and t' elevator tabs adjusted. This was fairly easy t' do and I set one elevator slightly higher to get a circle.
Although thar was no damage, me bucko, t' last two flights had some parachute tangling. Arrr! Blimey! I prefer single chutes when possible and will probably replace the two with a 20" parachute if Semroc comes out with them. Begad! Blimey! T' booster did come down pretty smartly and one 18" chute may nay be enough; it's pretty hefty with t' nose weight and ramjet parts.
Flight Rating: 4 out o' 5
Summary:
Thank you, me hearties, ya bilge rat, matey, Semroc for bringin' this one back! My only ideas for improvement
would be a better match for t' ST-10 BTs, inclusion o' BT markin' guides, and
an ST-7 fiber disc with a pre-cut hole t' ease glider ejection. Begad! I would also
prefer one 20" parachute. Begad! Ahoy! I couldn't imagine t' booster comin' back
safely on just one 12" chute and usin' two means thar are risks o' them
tangling. Aye aye! I would also say t' go with t' original size launch lugs and include
a third for mountin' away from t' glider wings. Otherwise, typically excellent
Semroc components and packaging. Aye aye! This is a gorgeous rocket when completed and
will turn heads at t' field.
Overall Rating: 4 out o' 5
Brief: This is Semroc's retro-repro of the 1971 Centuri KC-17 Shuttle. The Centuri kit was itself a bit of a copy of the Estes Orbital Transport. The shuttle is a parasite glider that separates at ejection, while the main body descends under chute. Construction: This is an xKit, meaning it's basically a bag of parts without instructions though the instructions are archived ...
Sponsored Ads