Semroc Orbital Transport

Semroc - Orbital Transport {Kit} (KV-66)

Contributed by Chan Stevens

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstar_borderstar_border
Overall Rating: starstarstarstarstar_border
Diameter: 0.98 inches
Length: 23.00 inches
Manufacturer: Semroc
Skill Level: 3
Style: Clone, Glider

Orbital TransportBrief:
This is a modern reproduction o' an Estes classic kit from 1968. Blimey! It features a futuristic piggyback shuttle, matey, inspired by a NASA scramjet design. Begad! While I can't claim t' have been into rocketry back in t' 60's when this came out, I had just gotten into rocketry earlier this decade when Estes re-released t' kit for a limited run, so this kit technically be t' first "retro repro" o' somethin' I'd previously picked up and built as an original.

Construction:
Parts are Semroc's usual excellent quality, and include:

  • (2) Balsa nose cones
  • BT-20 tube
  • BT-50 tube
  • (4) BT-5 tubes
  • 18mm motor tube kit (hook, matey, tube, centerin' rings, etc.)
  • Laser-cut balsa fin set
  • Waterslide decals
  • Keelhaul®©™/Elastic shock cord
  • 12" plastic chute

One thin' I remember from t' original, me bucko, arrr, and nay at all fondly, be t' hand-cuttin' o' all those stinkin' pieces. Aye aye! Avast! Blimey! In fact, me hearties, it was just a couple weeks after I'd built and flown mine that BMS introduced sets o' laser-cut fins for about $7, and I picked up a couple sets for future cloning. Aye aye! Fortunately, me hearties, in t' Semroc kit, t' fins are already taken care of.

This is nay that difficult an assembly, and as such I'd probably give it a 3 on t' 5 scale for difficulty scale simply because thar are so many different pieces and placement/orientation can be critical. Ya scallywag! Avast, me proud beauty! T' instructions are very good--well written with ample illustrations.

Parts Construction begins with t' booster assembly, which be t' main vehicle. Start with t' fins, which are two-piece glued together. Next comes buildin' up t' (4) scramjet housings. Begad! This be a breeze, me hearties, me hearties, thanks t' some actual etched lines for alignment. Begad! Blimey! In me case, ya bilge rat, I had an early edition o' t' kit, and thar be a slight dimensional error on t' upper plate, me bucko, which left a small gap (see photo). Avast! Blimey! T' fin assemblies are completed by tackin' on win' tips.

With t' win' assemblies drying, arrr, thar's now time for t' motor mount. This is a standard motor tube, metal hook, and a pair o' centerin' rings. Well, blow me down! T' Keelhaul®©™ shock cord is anchored around t' forward centerin' ring.

Buildin' up t' booster is fun, shiver me timbers, as it's a far cry from basic 3FNC design. There are a lot o' lines t' mark (usin' wrap-around markin' guide). Ya scallywag! Aye aye! T' fin assemblies go on first, matey, me bucko, and thar's even a cardstock alignment guide (though mine was off a small bit). Begad! Next come fairings attached t' t' main fins. I'm nay sure I get why this isn't done offline rather than once t' main fins are already on, and I'd suggest bondin' them all at once.

I followed up by attachin' a pair o' forward strakes, arrr, followed by (4) trim pieces at t' aft end, arrr, me hearties, matey, 2 o' which serve as support braces for t' shuttle later.

Tubes Flippin' it over, arrr, thar are more trim details on t' underside, me hearties, ya bilge rat, and positionin' is made much easier by usin' a cardstock template.

T' glider construction features as simple a technique as I've ever seen for buildin' a dihedral on t' wing--just drape each half over t' BT-20 body tube and glue in place. Seal off t' aft end with a cardboard disk, shiver me timbers, then trim it with a rolled shroud (nacelle). Blimey! Blimey! Rear elevons are attached and alignment again is assured by usin' a cardstock template. Avast, shiver me timbers, me proud beauty! Blimey! Last but nay least, t' rudder goes on, ya bilge rat, along with t' launch lug/dowel that acts as a pin holdin' t' shuttle t' t' carrier rocket.

Finishing:
Finishin' is quite easy on this, and t' finished rocket is very good looking. Ya scallywag! Since this is a glider, me hearties, me hearties, it's important t' go easy on t' weight, so I hit mine with a very light primer and single coat o' gloss white Krylon for t' shuttle. Ya scallywag! T' carrier rocket got two coats o' gloss white. Arrr! I avoided usin' any filler at all.

T' decals really make this look sharp. Well, blow me down! I'd rate them right up thar near t' classic Interceptor in terms o' impact on appearance. In this case, Semroc stayed pretty close t' t' original Estes decals, ya bilge rat, though inserted their own name in a few spots.

Construction Rating: 4 out o' 5

Ready to fly

Flight:
For t' first flight, me bucko, I ventured out on a cold winter day with winds puffin' a steady 5-6, maybe peakin' at 10. Arrr! I had ham-fistedly broken one fin prepping, so had t' CA it back on and wait for it t' cure.

I went with a C6-5, t' highest recommended motor, in part wantin' t' make sure I had plenty o' thrust t' overcome any wind. Aye aye! It left t' rod fine, arrr, but on t' way up did a gentle swoopin' barrel roll, then leveled out into a nearly horizontal flight path, peakin' at about 300 feet. T' glider held on t' whole way, impressive given t' pilot's aerobatics.

Recovery:
T' 12" plastic chute strikes me as a bit small for this, me hearties, and I came down a bit hard but landed in snow, so no damage. Begad! As for t' glider, matey, it fared reasonably well against t' winds, shiver me timbers, me hearties, tryin' its best t' circle around t' t' left, t' gettin' knocked around a bit, arrr, then levellin' back out for another attempt at a turn. Avast! I'd say I lasted about 40 seconds, which was actually pretty good given t' poor boost altitude.

Flight Rating: 3 out o' 5

Summary:
I'm a big fan o' t' classic Orbital Transport, and really like this retro-repro, ya bilge rat, matey, bringin' it back at an affordable price, ya bilge rat, especially with t' improvement o' laser-cut fins. Havin' just built t' SST Shuttle competitor t' this, ya bilge rat, shiver me timbers, though, matey, I'd have t' say I tend t' like t' cool ramjets o' that one just a bit better. Blimey! Still, ya bilge rat, you can't go wrong with either one in your fleet.

Overall Rating: 4 out o' 5

Other Reviews
  • Semroc Orbital Transport By John R. Brandon III (May 27, 2009)

    A Retro-Reproduction of Wayne Kellner's 1968 design for Estes. It represents a scramjet carrier aircraft with a piggybacked orbiter. This was my first Semroc kit, and it will definitely not be my last! It came in a plastic bag with four-color header card. The kit included precut body tubes in three diameters and three lengths, three sheets of laser-cut balsa fins, two nice balsa nose ...

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