Grumman G21 Turbo-Goose (oz16004)
About this Plan
Grumman G21 Turbo-Goose. Free flight scale model for rubber power. Wingspan 36 in.
Note plan shows construction details for both turboprop and radial-style nacelles. Model pics here show the radial engine version.
Direct submission to Outerzone.
Quote: "Steve and Mary, I was asked if I had a plan of my Grumman G-21a Goose. At the time of my build I had used a three view off the net enlarged to 36" span. I then used the lost foam technique to build the fuselage and nacelles for this flying boat. I've always loved this plane ever since I'd flown on one to Catalina Island many years ago. It was a great adventure.
The lost foam technique is similar to the solid models I made in my youth. Where we took patterns of the profile and top view of the fuselage and carved a balsa block into shape and finished it off sanding it to final shape. The wings being made of sheet balsa back then.
This lost foam technique requires the shaping of the fuselage in the same manner of the solid models of the past. I made sure to keep the patterns 1/16" smaller on each side so the finished project would be using the 1/16" balsa stringers around the foam pattern to make the model.
I also found a neat trick to keep the static electricity of sanding the foam to a minimum. I don't remember exactly where but I had heard that anti-static dryer sheets could be rubbed over the foam as it was being sanded to shape and the foam particles wouldn't cling to your hands and sanding block and could be easily blown away from the block.
Originally I used the cracked rib technique to build the main wing (in drawing the plans I've used the Rees' sliced rib style). This whole build can be seen on stickandtissue.com here's a link: https://www.stickandtissue.com/forum/cgi-bin/yabb2/YaBB.pl?num=1499838756
Here is the new plan... I have included the radial engine and nacelle for the original Goose power plant.
Here are a few picture of the original build of the standard G-21a Goose [main pic, 003-008].
Regards
Tom Akery/Sky9pilot"
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ScaleType: This (oz16004) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.
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User comments
Tom Akery is very ingenious at building really lightweight structures. It would be great if he could do a Spitfire as most of other designers efforts are so poor.Richard Falconer - 04/05/2025
You can wet-sand extruded styrene foam, too. That really keeps the dust down.
Lincoln - 04/05/2025
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- Grumman G21 Turbo-Goose (oz16004)
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