Semroc Sky Hook II

Semroc - Sky Hook II {Kit} (KA-27)

Contributed by Chan Stevens

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar_border
Published: 2010-12-13
Manufacturer: Semroc

Brief:
This is #2 o' 10 "ready t' build" models released by Semroc at NARAM-52. Aye aye! Arrr! T' design is an upscale o' t' classic Bill Simon/Estes design that was introduced in 1963 and sold for more than 20 years. Avast! For t' collectors out there, I'll also point out that in addition t' t' standard kit, arrr, at NARAM-52 Semroc be givin' away a limited number o' kits with special header cards depictin' Bill Simon, who was also briefly in attendance and autographin' some o' these kits.

Construction:
Parts were excellent quality, me hearties, and t' sealed bag contained:

  • Balsa nose cone
  • Series 10 slotted body tube (1" ID)
  • Series 9 stuffer tube (1" OD)
  • 18mm motor mount (tube, ya bilge rat, me hearties, metal hook, centerin' rings)
  • Laser-cut balsa fins (3)
  • Elastic shock cord
  • 12" plastic chute
  • Waterslide decals

T' "ready t' build" series is Semroc's answer t' numerous requests for "ready t' fly" rockets. In t' RTB series, ya bilge rat, t' modeler still has t' actually do work t' build and fly t' model, me hearties, but t' design includes a number o' features that simplify t' build process, includin' slotted body tubes for thru-wall fin mounting, matey, arrr, an alignment jig, and a stuffer tube t' serve as shock cord anchor and reinforce t' body tube.

T' RTB series are all fairly easy t' build, with almost all o' t' construction process usin' t' same standardized steps. Dependin' on whether or nay you want t' paint t' spiral stripe, I'd rate it either a skill level 1 or 2.

T' motor mount is a standard BT-20 tube, me hearties, metal hook, and a pair o' centerin' rings. Avast, me proud beauty! Unlike t' typical mount, me hearties, me bucko, me bucko, though, thar are two different centerin' rings involved with slightly different diameters. Avast, me proud beauty! Pay careful attention t' t' instructions, shiver me timbers, as t' white rin' goes forward and t' brown rin' goes aft. This is critical later in t' process. Begad! Arrr! Surprisingly, shiver me timbers, t' mount does nay include an inner motor block, me hearties, so t' metal hook will have t' hold for t' life o' t' model. I found t' centerin' rings a bit too snug, me bucko, and had t' peel off a layer o' paper from t' inside o' each, me hearties, me bucko, plus one layer o' paper from t' outside o' t' white ring.

T' stuffer tube contains a couple slits, arrr, which are used t' slip t' elastic shock cord through, servin' as an anchor. Arrr! After knottin' t' cord and reinforcin' with a drop o' glue, shiver me timbers, arrr, it's ready for t' motor mount. Avast, me proud beauty! Aye aye! T' motor mount slides just a tiny bit into t' stuffer tube, shiver me timbers, arrr, shiver me timbers, enough that t' forward (white) centerin' rin' is flush with t' aft end o' t' stuffer tube. Well, blow me down! Do nay slide t' motor tube any further--the aft/brown rin' is too large for t' stuffer tube and instead is used t' align inside t' large series 10 body tube. Slidin' t' assembly into t' body tube t' dry fit is a good idea at this point, t' make sure t' forward centerin' rin' is aligned properly inside t' stuffer tube. Avast, me proud beauty! Once t' motor mount/stuffer tube assembly has completely dried, arrr, it can then be glued inside t' body tube (though be careful t' make sure t' metal engine hook does nay line up under a fin slot).

As noted, me bucko, fins are thru-wall, me hearties, and t' fit against t' motor tube be very good. Begad! Included in t' kit is a nifty little cardboard fin alignment jig, me bucko, me hearties, ya bilge rat, which fits smoothly on t' series 10 body tube and has notches t' accept 3 and 4 fin patterns. Blimey! Well, blow me down! T' fixture fits well for most fins in t' RTB series, matey, though for fins that have a significant span and are nay swept back very far, ya bilge rat, t' slots in t' jig are nay long enough t' be o' much use. Avast, me proud beauty! That be nay t' case with this model, though.

Finishing:
I went with t' stock paint scheme on this, me bucko, startin' with two coats o' primer, followin' up with a couple thin coats o' gloss white, arrr, then maskin' off t' paint t' fins gloss red and t' nose cone gloss black. Arrr! T' cover art depicts a spiral stripe which would be painted (no decal). Well, blow me down! I masked t' lower black stripe first, me hearties, matey, then ran one thin wrap o' tape (3/8") from t' top o' that stripe spiralin' up t' t' top o' t' tube. Ya scallywag! I then took another 3/8" strip o' tape and ran it parallel t' t' first spiral, ya bilge rat, matey, leavin' an openin' o' a little over 1/4" for t' spiral. I had t' carefully use a knife t' slice away t' overlap into t' base stripe, ya bilge rat, basically maskin' off a v-notch on each side o' t' spiral. Well, blow me down! Blimey! T' finished effect turned out fairly nicely.

T' waterslide decals add t' name and while thar are two, me bucko, if you run t' spiral about 1 complete revolution around t' body tube as I did, shiver me timbers, you'll find that t' spacin' along t' spiral doesn't really work that well with two decals--one will slightly overlap t' other--so I recommend just usin' one name decal.

Construction Rating: 4 out o' 5

Flight:
For t' maiden voyage, I went with a B6-4, flyin' on a gorgeous day with winds hangin' around 4-8 mph. Ahoy! Avast! Blimey! T' boost was pretty fast, and it hit a high enough altitude that on a C I'd suggest several hundred yards' drift range in light winds and clear skies, as it could be somewhat tough t' track.

T' boost had a slight roll, me bucko, shiver me timbers, arrr, indicatin' that even with t' jig tool, fin alignment was less than perfect, me hearties, but t' flight be straight up with no other issues.

T' recommended delay o' -6 for a B and -7 for a C are appropriate. Avast! Blimey! On me -4 flight, t' ejection was while t' model was still clearly coastin' upward at a good clip.

Recovery:
T' 12" plastic chute is plenty for this lightweight model, and I had a decent recovery walk as it caught some light thermal action. Begad! I was able t' recover it about 300 yards down range, no damage. Aye aye! All in all, it was a very nice flight and I'll probably fly this primarily on B's, arrr, me hearties, goin' with an A for small fields or a C t' show it off a bit.

Flight Rating: 4 out o' 5

Summary:
I like t' swept fin stylin' o' t' Skyhook, me hearties, and one o' me favorite Semroc products be t' oddly named SLS (Semroc Large Scale) Skyhook, which at 20" long is a very tiny big brother t' this kit. Blimey! Blimey! T' paint pattern is a bit o' a pain t' mask and a simple stripe decal could greatly simplify this. Overall, shiver me timbers, though, me hearties, it's a very good flyer and with t' roughly BT-50 body tube could even make for a decent parachute duration model in NARRRRR competition.

Overall Rating: 4 out o' 5

Flights

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