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Glaser Dirks DG-600 series
The successor to the DG-202/DG-400, the unpowered 15 m. racing class DG-600 first flew in 1987, followed by the self-launching DG-600M in 1989. The fuselage is based on that of the DG-400, but with a more slender tailboom. The wing has a thin section with fully span flaperons and approach control is by the top surface double panel Schemmpp-Hirth type airbrakes. There is also a fin ballast tank which carries 7 kg of water. The wing has a more modern thinner airfoil and thus higher performance than that of the DG-400, however slow flight problems became evident as the glider had a tendency to stall. Because of this, a manadtary “Stall Warning” placard had to be shown. These flying characteristics gave the glider a bad name and so it was never a great success. There are three very different models of the DG-600:
The 17 m version is quite a different story and has been increased to 18 meters by adding winglets. At this larger span the stall is significantly more acceptable. The performance at high speed is as good as the DG-800. Only in climb, is the ‘800 better while retaining good flight characteristics!
A DG-600/18M with winglets is, without question, competitive in the 18 meter class.
The motorised version of the DG-600 used a very small, one cylinder Rotax engine. The resulting DG-600M was capable of self launching but with only 25 Hp, the rate of climb is pretty low. Because of the motor's small size, the noise level measurements were also low when it flew over the measuring point giving a value within the German “ordinary noise . The wing moulds for the DG-600 were destroyed in a factory fire in 1992, so only 112 units were built.
Acknowledgements :- Wikipedia
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