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, each roughly 1/10th t' size o' t' real thing. Ahoy! This model is based upon t' Atlantic Research Corporation's soundin' rocket. Ahoy! T' kit is just for t' upper stage, ya bilge rat, as t' real soundin' rocket flew off o' different booster configurations, matey, never on its own, so this model would nay qualify for entry in an NARRRRR competition. Avast! Ahoy! Still, 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, matey, as usual:

  • Balsa nose cone (8 inches long, 1/3 o' t' total rocket length!)
  • Series 11 body tube (1.17" OD)
  • BT-20 motor tube
  • Centerin' rings, matey, ya bilge rat, motor block, shiver me timbers, 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, arrr, I'd probably rate t' skill level a 2 on t' 1-5 scale, arrr, matey, simply because t' paint/finishin' pattern is a little tricky. Ahoy! Blimey! Aye aye! Blimey! I'd estimate I spent about 5 hours on this plus finishing, shiver me timbers, and t' finishin' be 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. Ya scallywag! Arrr! It struck me as a little hokey at first, shiver me timbers, me hearties, but I have t' admit with several hundred sets o' kit instructions stuffed into a milk crate for a file, 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. Ahoy!

T' motor mount is typical tube, block, arrr, me bucko, metal hook and centerin' rings combo, with t' Keelhaul®©™® shock cord anchored around t' forward ring. Ahoy! Blimey! Mark t' body tube for 4-fin pattern usin' a template on t' instruction page, arrr, then insert t' completed motor mount assembly into t' main body tube. Well, blow me down! Blimey!

Prior t' mountin' t' fins, though, ya bilge rat, ya bilge rat, comes a little scale realism. Blimey! Blimey! Blimey! First, me bucko, arrr, arrr, thar's a nifty pair o' wrap-around bands that just fit under cutouts in t' fins. Avast, arrr, me proud beauty! Blimey! Pay careful attention t' t' instructions, arrr, as thar's a glue side and a shiny/don't glue side. Arrr! Blimey! 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, shiver me timbers, then t' wrap gets narrower for t' second trip around, me hearties, me bucko, for t' smaller band. Blimey! One o' t' bands goes under t' fins (before bonding, arrr, matey, o' course)and t' other goes flush with t' forward end o' t' body tube. Ahoy! Arrr! Blimey!

T' fins themselves get a couple small cardboard mountin' plates tacked on underneath them, me bucko, shiver me timbers, also in laser-cut notches. Avast, me proud beauty! Realizin' that t' fins would be red, me hearties, 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, me bucko, matin' up t' t' black/white/silver painted main body later. Well, blow me down! Well, me bucko, blow me down!

T' nose cones gets a screw eye anchor, and a pair o' 1/8" lugs are tacked on, me hearties, wrappin' up construction. One note on lug placement, arrr, 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! T' lower black rectangles and upper white rectangles get decals in t' middle, so you want t' avoid these areas for lugs. Avast! Avast, me proud beauty! That leaves half t' body, ya bilge rat, 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, matey, I did a fair amount o' t' finishin' before/durin' construction. For t' main tube, shiver me timbers, with bands applied, matey, I applied a couple thin coats o' gray primer, then 2 coats o' gloss white, arrr, sandin' after primer and finish coats. Well, blow me down! Well, me hearties, blow me down! I then drew 4 fin lines with a black Sharpie, which I then used for markin' and maskin' off t' rectangular regions, ya bilge rat, covering up t' white. Well, blow me down! I hit everythin' with 2 quick coats o' gloss black, then masked off t' body tube from t' aft band forward, ya bilge rat, me hearties, shootin' t' lower section with silver.

T' fins, ya bilge rat, shiver me timbers, as noted, arrr, were painted red offline then tacked onto t' main body with CA, 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, so applyin' them over t' black region be fine, ya bilge rat, matey, though t' gloss wasn't quite an exact match. Avast, me proud beauty! T' black Iris decals went on t' upper white rectangles.

 

Construction Rating: 4 out o' 5

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

Recovery:
I certainly did have a bit o' a walk, me bucko, though nay too bad. Begad! 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, ya bilge rat, especially t' fins, ya bilge rat, wraps, arrr, and black on white decals.

Cons--none. Ahoy! Ya scallywag!

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

Overall Rating: 4 out o' 5

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    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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