Scratch Gargantuan Galaxy Guppy Upscale

Scratch - Gargantuan Galaxy Guppy {Scratch}

Contributed by Bill Eichelberger

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Published: 2011-05-19
Manufacturer: Scratch

Brief

The GGG is a 24mm powered, 1.59x upscale of the Estes Goonybird Galaxy Guppy.

Components

  • 8" length of BT-80
  • 2.75" BT-50J
  • AR-2050 engine block
  • 2 CR-5080 centering rings
  • PNC-80BB
  • 36" length Kevlar shock cord
  • 36" length 1/4" sewing elastic shock cord
  • 3/32" balsa stock
  • large snap swivel
  • 12" nylon parachute

Construction

Goonys are notoriously easy to build in their original and upscaled forms. That said, this is one of the easiest of the bunch. (The easiest being the Star Snoop, but that was really just a Fat Boy with a different set of fins.)  The original BT-60 Goony called for 8 fin parts to be cut to create the four heavy duty fins, but I just went with 1/8" balsa all around.  Fins were attached with LocTite Gel CA, then filleted with Elmer's Wood Glue.  The motor mount was a broken three engine mount that I bought in an Ebay auction several years ago.  I figured that two 18mm motors combined with a 24mm motor would be a bit on the overkill side, so I plugged two of the holes with expended casings and just made the rocket E-capable.  I tied a 3-foot length of Kevlar in behind the front centering ring and attached that to a 3-foot section of 1/4" sewing elastic.  A large snap swivel and a 12" nylon parachute finished the recovery system off.

Finishing

Since I had a pretty good idea what the finished product was going to look like, finishing was simply a matter of picking the paint.  After the slop and seal process with thinned Elmer's Fill & Finish, the rocket was sanded and sprayed with two coats of Valspar primer.  The unintentional, but somehow fitting Miami Dolphins color scheme came about more out of luck than planning.  Original Guppys looked to be of a baby blue persuasion with orange fins, but I had a can of mystery paint laying around that I figured would be close enough.  It reminds me of a 70's appliance paint and when mixed with Valspar Harvest Orange, seemed to convey the fishiness that I had hoped to capture.  I'd tried printing the decals out onto mailing label paper and sealing them with clear spray on previous Goons and had never been quite satisfied with the results, so I made my own decals by blowing up the original sticker scans by 160%, then printing them on white Bel Decal inkjet paper.  The results were far better than I'd hoped.  Fin details and the mouth were drawn on with a paint pen, which was far and away the most nerve-wracking part of the project. 

Construction Score: 5

Flight

The only flight to date came on a day when normal men would have packed up and gone home.  Blustery doesn't really cover it, and if you look at the launch pics, you'll notice that the pad is actually tilted into the wind far more than would seem safe.  Or smart.  That said, I wanted to fly, and I'd driven 45 minutes to fly, so fly I did.  The flight itself was perfect and quite impressive.  Tearing off the pad into the brisk breeze, the GGG looked perfectly at home under E9 power.  The flight path took it well to the south and quite a bit higher than I'd anticipated.  This became an issue during recovery.  Even with a reefed chute, the GGG passed back over the flightline with several hundred feet to spare, heading for the lake at the north end of the VOA property.  I watched it descend, landmarked the spot, and headed out on my recovery mission.  I looked forever on both sides of the water, in the water and all along the walking paths.  I found an R/C plane floating in the lake and retrieved it for the owner, but no Guppy.  Just as I was about to give up, two kids came up and asked if I was looking for a rocket.  They led me to the edge of the lake in a spot that was hidden from my view by a patch of reeds.  The Guppy hadn't gone completely into the water, but had hit the path and bounced to the water's edge with the rear end sitting in the water.  The E9 casing was swollen in the motor tube, and at first I thought it was going to be stuck for eternity, but I was able to dig it out with my multi-tool.  The fact that the rocket stood up to the extraction process impressed me greatly.  This fish was tough.

Recovery

Flight Rating: 5

Summary

Pro's: As I've said before, it's a Goony.  Ease of construction. 

Con's: Launch fever.  Lack of a Fat Boy kit for donor parts.

Overall Rating: 5
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