Semroc Sky Hook

Semroc - Sky Hook {Kit} (KV-9)

Contributed by Bill Eichelberger

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Published: 2013-07-01
Diameter: 0.76 inches
Length: 11.70 inches
Manufacturer: Semroc
Style: Sport

Brief

The Sky Hook was one of the early Estes kits that combined great looks and performance with being nicely suitable as a beginner's rocket.  The original, then known as the Astron Sky Hook, graced the Estes catalogs from 1964 to 1988, and it was a sad day indeed when the Sky Hook disappeared from store shelves.  Luckily for us it was also one of the very early Semroc kits when they began selling again after a 31 year absence.  The Sky Hook was part of my second order, twelve days after my first order.

Components

  • BNC-30N nose cone
  • BT-30F body tube
  • EB-30A engine block
  • laser cut balsa fin stock
  • LL-1B launch lug
  • small screw eye
  • 12" parachute
  • Kevlar shock cord
  • 1/8" sewing elastic shock cord

Construction

As a first kit, the Sky Hook would be hard to beat.  Get the engine block glued in with the Kevlar attached, get the fins on straight and the launch lug in place and you're ready to launch.  This is a build it Friday, paint it Saturday, fly it Sunday bird, but unless you're using a 1/2A6-2, make sure you have a nice big field.  Although I started construction earlier in the week than Friday, I managed the construction without difficulty, got the paint on so it looked decent, and it was indeed ready to fly on Sunday.  It's rare that a plan comes together so completely for me.

Finishing

While not a single color bird like my Estes Beta was in 1977, the Sky Hook paint scheme was quite simple.  Using Valspar primer and paints, I first primed the completed rocket before covering it with a coat of thinned Elmer's Fill & Finish.  After sanding it recieved another coat of F & F and more sanding, but two coats is my limit.  After the final coat of primer was dry, I sprayed the fins with Apple Red and the nose cone with gloss black.  After letting the fins dry I masked them off with Painter's Touch masking tape, then sprayed the main body tube gloss white.  No decals came with the kit, so I decided to go with the look from the 1977 Estes catalog, my first.  I masked the body off and painted the two stripes in gloss black.  Except for the small area of black just behind the fins, which I skipped, it's a pretty good representation of the Summer of '77.

Construction Score: 5
 
 

Flight

Despite the mile square field at VOA, I was leery of putting too much motor under the Sky Hook for the first flight in March of 2004.  It was a fairly breezy day, so I loaded it with an A8-5, which turned out to be more than enough motor for conditions.  The flight was fairly straight considering conditions, and quite high considering it was only an A8.  It was nosing over when the ejection charge fired, and the mild bit of windcocking it did was obviously not going to be enough to cut down on my recovery hike.  It recovered over toward the ski-hill at the west side of the field.  I got a bead on the spot and began marching, surprising myself by walking almost right to the Sky Hook.  A reefed chute might have been a good idea, but the chute was one of the first Semroc chutes I had and I couldn't bring myself to cut it up.  All things considered, this could have easily been a streamer flight.

The second flight was on a B6-4 and was quite an eye-opener.  Chan Stevens and I were flying a bunch of rockets for review and had picked a cold, clear, largely windless day to do our flying.  I say largely windless because the Sky Hook managed to catch the one good breeze of the day.  The B6-4 flight was quite high, and made me realize that I stood little chance of getting the Hook back if I chose to fly it on a C6.  After a high, straight flight the Hook caught the breeze and was carried to the very edge of the VOA field.  I started my trek thinking that I was going to stand very little chance of recovering the rocket, and several times considered calling off the search, but the line I'd chosen took me almost right to the landing spot, albeit a lot further than I'd initially thought.  As I remarked in my flight log, I felt priveleged to get it back.

The third and unfortunately final flight was on a surprisingly warm Saturday at B6-4 Field in Ft. Thomas, just a couple of months after we'd moved into the neighborhood behind the field.  As usual, the sound of rockets drew a crowd, and I wound up with several of the neighborhood kids who took turns punching the button for me and served as my recovery crew.  I chose a B4-4 for the flight, obviously having forgotten the height attained by the previous B flight.  The flight windcocked fairly severely over the country club, but was descending nicely and looked like it was going to drop right on the infield of the ball diamond.  Then came the rogue thermal.  One of my ground crew had run over to what looked like the landing zone, but the rocket suddenly began rising.  He blindly ran along under it, and was close to running out into traffic when I yelled and stopped him.  We watched the rocket rise, eventually attaining greater height than the flight had, all the while drifting in the general direction of the river.  It appeared to still be rising as it disappeared over the YMCA.  I ended the day explaining what a "thermal" was.

Recovery

Depending on field conditions, this might be a good candidate for a switch to streamer. ;-)

Flight Rating: 5

Summary

Pro's: Cool retro bird.  Anything that once had Astron as part of the name is worth having in the fleet.  (Well, the possible exception being the Astron Invader.)

Con's: Very iffy as a parachute bird unless you've undertaken recovery as an exercise regimen. 

Overall Rating: 5
Other Reviews
  • Semroc Sky Hook By Dennis McClain-Furmanski

    Brief: Reproduction clone of Estes' Astron Sky Hook circa 1963; single stage, parachute recovery Construction: The parts list: 1 body tube 1 balsa nose cone 1 set laser cut fins 1 thrust ring 1 launch lug 1 screw eye 1 elastic cord 1 Kevlar ® thread 1 plastic parachute 1 set tape disks 1 set shroud lines 1 empty casing I bought, ...

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