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Sailplane Aviation Concepts 1/3-scale Schweizer SGS-233A

JimD

50cc
As soon as we heard the news that this 1/3-scale kit was going to be produced, we got on the waiting list. The force behind this effort is Gunny Bumburs of Aviation Concepts. Other kits include a highly detailed 87.5" span 1/5-scale Fairchild PT-19A and a 1/4-scale Schweizer SGS 233A. Aviation Concepts can be found at the Hangtimes Hobbies website:

http://www.hangtimes.com/index.html
http://www.hangtimes.com/aviationconcepts.html

Many of you know Hangtimes Hobbies as the home of NoBS Batteries (which we have used in all of our planes and transmitters the last 20 years).

We first met Gunny at the New England Aero Tow in 2010. He brought his beautiful 1/4-scale Schweizer SGS-233A and just mesmerized the group with its performance. Here he is accepting the award for the best scale model at the event.

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Having grown up next door to a full-scale Soaring Club that used a Schweizer SGS-233A sailplane as their trainer, this sailplane holds a special place in my memory. Aero towing was just an everyday occurrence at my house and something I really wanted to duplicate in R/C.

Anyway, after meeting Gunny and seeing the 233 fly, I ordered one of his kits and proceeded to build the 1/4-scale model and finished it in the scheme of the local full-scale 233. Here is that model after its maiden flight (do I look happy)!

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When Gunny announced that he was going to produce the 1/3-scale model, I signed on. The kit parts are packed in a big brown box that measures 12" x 12" x 36" and is heavy with all of the laser and CNC router cut parts, much of which is plywood. The box is packed in the typical Gunny way, a place for everything and everything is its place. Gunny actually makes these kits in his own facility and packs each box himself and with great care. Let's look inside:

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The construction manual is a work of art unto itself! Color pictures for each step!
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There are eight rolled sheets of full-size plans that each have color and seal to show authenticity.

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Each kit has a serial number and mine is #3...He even includes these laser marked parts:

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Gunny is an artists with his laser cutter, check out this rendering on one of the plywood parts sheets!

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Bartman

Defender of the Noob!
Very cool project and I'm not a huge sailplane guy! the laser etched logo on the plywood is a classy touch.
 

JimD

50cc
Now to get started on the build. Following the manual, the first steps are construction of stab/elevator and fin/rudder.

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JimD

50cc
There are scale sailplane enthusiasts scattered around the USA. Many of us have become semi organized and hold 2-5 day events at least monthly around the country. There is a huge well of talent in this group and guys with the dedication to travel many, many miles to attend events and support this little part of the R/C world. Horizon Hobby has been a major supporter having produced two giant scale tow planes (Piper Pawnee and Super Decathlon) and two giant scale sailplanes (Blanik L-13 and the new ASW 20).

http://www.horizonhobby.com/airplanes/giant-scale/33-pawnee-80cc-arf-han5190
http://www.horizonhobby.com/airplanes/giant-scale/super-decathlon-100cc-arf-han1070

http://www.horizonhobby.com/airplanes/sailplanes/l-13-blanik-42m-arf-efl4910
http://www.horizonhobby.com/product...sailplanes/asw-20-47m-arf-(2-boxes)-p-han4955

One of the guys in our group is a machinist and produced a scale tow release for the Schweizer models and Gunny offers a modification kit for those wanting to use this custom release. I bought one of the releases and have had it for months while waiting for the kits to go into production...it is beautifully done.

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Now on to the fuselage...glad I have an 8' workbench!

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Bartman

Defender of the Noob!
I've got to talk to this Gunny guy about making a giant Grumman Duck.....I was tipped off to a guy making scale Grumman retractable landing gear so that part is already ready to go....Gunny, I'm coming for you! Or does he only do sailplanes?
 

JimD

50cc
I've got to talk to this Gunny guy about making a giant Grumman Duck.....I was tipped off to a guy making scale Grumman retractable landing gear so that part is already ready to go....Gunny, I'm coming for you! Or does he only do sailplanes?

I've got dibs on him for the next project! I want a 170cc Cessna Bird Dog tow plane! :mario-banana:
 

JimD

50cc
The stab mount is made up of four pieces that need to be glued together with care so that the holes in the front middle and back form a straight line. This sets the fin alignment. We drilled shallow holes in the basswood spine and the plywood stab mount to make "epoxy nails."

The stab mount was carefully aligned and epoxied in place. Gussets were added to tie the blocks to the "spine" and clamped in place. Holes for the fin dowels get drilled down into these blocks. Doesn't look like much progress, but these steps need to be done with care.

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