Semroc Iris

Semroc - Iris {Kit} (KD-4)

Contributed by Chan Stevens

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar_border
Diameter: 1.17 inches
Length: 23.80 inches
Manufacturer: Semroc
Skill Level: 1
Style: Scale

Brief:
T' Iris is one o' t' first o' a new sport scale line by Semroc called t' Deci-Scale, matey, each roughly 1/10th t' size o' t' real thing. Aye aye! This model is based upon t' Atlantic Research Corporation's soundin' rocket. Avast, me proud beauty! T' kit is just for t' upper stage, me bucko, as t' real soundin' rocket flew off o' different booster configurations, never on its own, matey, matey, so this model would nay qualify for entry in an NARRRRR competition. Avast! Still, me hearties, shiver me timbers, it is a cool lookin' rocket and a bit more complex a build than t' typical 3 or 4 fin fare that's t' majority o' t' commercial rocketry fleet.

Construction:
Components are all excellent quality, as usual:

  • Balsa nose cone (8 inches long, ya bilge rat, 1/3 o' t' total rocket length!)
  • Series 11 body tube (1.17" OD)
  • BT-20 motor tube
  • Centerin' rings, shiver me timbers, motor block, metal hook
  • Laser-cut balsa fins (4)
  • Laser-cut fin mounts (8)
  • Laser-cut tube bands (2)
  • Keelhaul®©™®/elastic shock cord
  • Plastic parachute
  • Waterslide decals

While this is a relatively easy scale model, I'd probably rate t' skill level a 2 on t' 1-5 scale, simply because t' paint/finishin' pattern is a little tricky. Blimey! I'd estimate I spent about 5 hours on this plus finishing, matey, ya bilge rat, me hearties, and t' finishin' was strung out over t' better part o' a week.

T' instructions follow Semroc's newer format, designed t' fit in a 3-rin' binder which can be spread open while building. It struck me as a little hokey at first, but I have t' admit with several hundred sets o' kit instructions stuffed into a milk crate for a file, me hearties, I'm startin' t' overflow a bit and usin' 3-rin' binders is a pretty good idea. T' instructions overall are about 3 letter-sized pages. Arrr!

T' motor mount is typical tube, ya bilge rat, block, metal hook and centerin' rings combo, with t' Keelhaul®©™® shock cord anchored around t' forward ring. Mark t' body tube for 4-fin pattern usin' a template on t' instruction page, shiver me timbers, then insert t' completed motor mount assembly into t' main body tube. Avast, me proud beauty!

Prior t' mountin' t' fins, shiver me timbers, though, comes a little scale realism. Ya scallywag! First, me bucko, thar's a nifty pair o' wrap-around bands that just fit under cutouts in t' fins. Pay careful attention t' t' instructions, me bucko, me hearties, shiver me timbers, as thar's a glue side and a shiny/don't glue side. Avast, me proud beauty! T' bands are a very precise fit, so I went extremely thin on t' glue so that they would make it all t' way around twice--the first trip puts down a wide band, me bucko, then t' wrap gets narrower for t' second trip around, for t' smaller band. Arrr! One o' t' bands goes under t' fins (before bonding, o' course)and t' other goes flush with t' forward end o' t' body tube. Blimey! Begad!

T' fins themselves get a couple small cardboard mountin' plates tacked on underneath them, ya bilge rat, also in laser-cut notches. Ahoy! Realizin' that t' fins would be red, shiver me timbers, mounted on a line where white and black zones meet up, I felt that tryin' t' mask and paint around t' plates would be difficult, so I bonded them t' t' fins and painted t' fins offline, shiver me timbers, matin' up t' t' black/white/silver painted main body later. Ahoy!

T' nose cones gets a screw eye anchor, arrr, arrr, and a pair o' 1/8" lugs are tacked on, wrappin' up construction. Blimey! One note on lug placement, keepin' t' finish paint scheme in mind. There are 8 rectangles alternatin' black and white (2 rows o' 4) on t' main body tube. Avast, me proud beauty! T' lower black rectangles and upper white rectangles get decals in t' middle, arrr, ya bilge rat, so you want t' avoid these areas for lugs. That leaves half t' body, but Murphy says if you don't plan it out up front, you'll find yourself tryin' t' apply a beautiful scale decal around a lug.

Finishing:
As noted, I did a fair amount o' t' finishin' before/durin' construction. Ya scallywag! For t' main tube, with bands applied, ya bilge rat, I applied a couple thin coats o' gray primer, then 2 coats o' gloss white, me hearties, sandin' after primer and finish coats. Begad! Aye aye! I then drew 4 fin lines with a black Sharpie, arrr, which I then used for markin' and maskin' off t' rectangular regions, covering up t' white. Ya scallywag! Begad! I hit everythin' with 2 quick coats o' gloss black, shiver me timbers, then masked off t' body tube from t' aft band forward, shootin' t' lower section with silver.

T' fins, ya bilge rat, as noted, me bucko, were painted red offline then tacked onto t' main body with CA, matey, matey, and really thin white glue fillets (applied with a syringe).

 

I had previously confirmed that t' white on black Atlantic Research Corp decals were white ink, as opposed to clear printed on white-backed paper, shiver me timbers, me bucko, so applyin' them over t' black region was fine, though t' gloss wasn't quite an exact match. Ya scallywag! Blimey! T' black Iris decals went on t' upper white rectangles.

 

Construction Rating: 4 out o' 5

Flight:
For t' first flight, ya bilge rat, I had a chance t' enjoy a magnificent late summer day at t' field, me bucko, winds around 6-8 mph, temperatures a perfect 76, clear skies, etc. Avast, arrr, me proud beauty! Blimey! Since it was such a nice day for a walk, I put this up on a C6-5. Ya scallywag! Blimey! It flew straight as an arrow, matey, though it seemed me delay be a hair longer than -5, me bucko, me hearties, so ejection be slightly past apogee, which I estimated t' be about 600-700 feet.

Recovery:
I certainly did have a bit o' a walk, me hearties, though nay too bad. T' 12" plastic chute brought it down at a modest but nay slow speed, and I recovered everythin' fine about 400 yards away.

Flight Rating: 5 out o' 5

Summary:
Pros--nice scale detail, especially t' fins, wraps, and black on white decals.

Cons--none. Arrr!

Overall, this is a very good scale-like kit for t' money.

Overall Rating: 4 out o' 5

Other Reviews
  • Semroc Iris By John "MAX" Venable (October 17, 2009)

    Brief: This is another TIGHT repro from Semroc. Very Sleek and FAST.Semroc supplied me with a 24mm mount for free. Construction: The Kit consists of: 1 Balsa Nosecone, 1 Body tube, Motor tube, 4 Balsa fins, 1 screw eye, 1 thrust ring, chute pak, kevlar shock cord, launch lugs, engine hook, a set of decals. The only con about this Rocket is ...

  • Semroc Iris By Ron Wirth (September 17, 2009)

    Brief: Semroc has recently started a new line of Deci-ScaleTM rocket kits that are 1/10 semi-scale models of the originals. The IRIS is one of the first in the Deci-ScaleTM line which is a semi-scale model of the real Iris designed by Atlantic Research Corporation in the early 1960s. This model is a 4 fin rocket with some added details that give a true scale appearance to the ...

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