Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The FLUGWAG Bremen ESS 641 was a 1970s German glider-towing monoplane designed and built by the Flugwissenschaftliche Arbeitsgemeinschaft Bremen research organisation. The ESS 641 is a low-wing cantilever monoplane with a fixed tail-wheel landing gear. Powered by a 180 hp (134 kW) Avco Lycoming O-360 flat-four piston engine. The pilot had and enclosed cockpit with a transparent canopy.

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