Siebert’s Ka6s are indeed very nice. Unfortunately, performance of the Sie.3 was only marginally better than the superb Ka6E – even debatable. Yet it handles a lot worse than its direct competitor. It was not incredibly stable in pitch, and would wander off on its own when you released the stick. Great fun if you like roller coasters, but very unhandy when you need to look at a map, or have a pee. Build quality was great, but the type came about at a time when wooden gliders were already a thing of the past. The one that went to museum was built at a time when Astirs, Cirruses, Libelles and ASW15s had been running the show for some years. Only 27 were built in the end, many of them in kit form. The one Sie.3 I owned (very briefly, just to ensure its future, after it had sat the better part of 12 years outside under a tarp) was the last one built, in 1974 just before the Siebert workshop closed its doors. Today Siebert is still very much involved in aviation, as a supplier of aviation materials (only) in Münster. It’s great to see this Sie3 has found a new home. They are becoming exceedingly rare these days.
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