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Old Aug 12, 2003, 08:55 PM
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building a 1/3 scale Puchacz (SZD 50)

Building the typical German large scale sailplane kit can be challenging without some prior experience. Kits generally have few or no instructions, and builder expertise is assumed in many cases by the manufacturer. There are conventions that may be unfamiliar to many American or other nationalities building techniques. These pictures and a few words will try to shed light on some of the critical and not so critical aspects of tackling a euro kit. The key advice is: always think twice about something before gluing, and sequence the steps in your mind before plunging ahead. This kit is unusuall because of the mid fin stab location. There is a lot of added complexity to this installation that a T tail would not have, but it makes an interesting photo sequence in any event.
This kit is designed and produced by HB Modellbau in Germany. Heiko Baumgertner produces excellent kits and some of the nicest wings found anywhere. The kits leave a lot of small tasks to the builder but he does include a very complete hardware and parts count.
First the proper glue is required. The use of a quality epoxy is a must for any project worth doing. Here is an example, plus a picture of fumed silica which is used to make a structural epoxy glue.
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Old Aug 12, 2003, 08:58 PM
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Proper consistency of mixed epoxy, actually this is on the stiff side. as long as it stays put and does not drip.
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Old Aug 12, 2003, 09:01 PM
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Mounting the sprung fixed wheel.
Bulkheads as supplied
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Old Aug 12, 2003, 09:03 PM
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another view
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Old Aug 12, 2003, 09:05 PM
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removable braces in place
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Old Aug 12, 2003, 09:08 PM
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with epoxy view one
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Old Aug 12, 2003, 09:16 PM
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second view. Put epoxy on pencil marks in fuse also. Use enough to tack in place after gear is removed you can reinforce joints.
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Old Aug 12, 2003, 09:18 PM
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Installing a retract is an identical process. You will see in the following pictures of the wing rod installation how I reinforce the landing gear by installing braces up to the wing rod. This is a good insurance against hard landings. It distributes landing loads to the wing mount and ties everything.together.
When I install the wing rod I choose to make my own ply wood wing root doublers to help add strength to the fuse. Especially important in an acro ship like the Puchacz.
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Last edited by scalesoar; Aug 13, 2003 at 06:09 AM.
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Old Aug 13, 2003, 06:12 AM
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root plates. wing rod is wound carbon fiber.
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Old Aug 13, 2003, 06:15 AM
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dry fit first
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Old Aug 13, 2003, 06:17 AM
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in glue, notice gear reinforcement. horozontal brace is temporary.
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Old Aug 13, 2003, 06:24 AM
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wheel in.
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Old Aug 13, 2003, 06:30 AM
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this is the only instruction for mounting the stab. Incidence marks are molded in for the thermal version of this plane, but the akro version, which I am building, uses less incidence in the tail.
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Old Aug 13, 2003, 06:33 AM
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elevator linkage supplied
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Old Aug 13, 2003, 06:37 AM
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stab with tubes before trimming to fit fin. The stab blanks need to be scribed to the shape of the fin. I used a drum sander on a drill press to rough it in, then eventually epoxy filler will be molded in to the gap using mold release on the fin for a perfect fit
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