The Groppo XL and Groppo Trail are very similar single engine, tandem seat, high wing ultralight aircraft designed and built in Italy.
Homebuilt aircraft, also known as amateur-built aircraft or kit planes, are constructed by persons for whom this is not a professional activity.
Sauer Flugmotorenbau (Sauer Aircraft Engines) or "Sauer" is a German manufacturer of aircraft engines based at Ober-Olm in Germany.
Ultralight aviation (called microlight aviation in some countries) is the flying of lightweight, 1- or 2-seat fixed-wing aircraft.
The Volkswagen air-cooled engine is an air-cooled boxer engine with four horizontally opposed cast-iron cylinders, cast aluminum alloy cylinder heads and pistons, magnesium crankcase, and forged steel crankshaft and connecting rods.
The Volkswagen wasserboxer is a four cylinder horizontally opposed pushrod overhead-valve (OHV) petrol engine developed by Volkswagen.