In 1935, he developed a small, light, single-seat biplane motor glider with a two-cylinder Kroeber M 4 engine, which had horizontal cylinders and developed a power of 18 hp. for flying powered aircraft.

 

The airframe design was mixed; the fuselage was made of steel pipes, and the bearing surfaces had a wooden load-bearing frame. The wing and fuselage were covered with linen. Taking into account the Olympic Games held in Germany in 1936, the nose of the glider, whose surfaces were painted in blue and ivory, were marked with Olympic rings. The glider did not pass official registration and therefore it did not have a civilian number.

 

First, the master mechanic Hugo Wild from the brewery and the son of Dr. Huebner Walter flew this glider. Both had no training in powered gliders and flew in the most complacent way, knowing nothing about flying in powered aircraft or about the controls. The flights were carried out from sites in Neckarwiesen near Obrigheim.

 

There were no problems with the transportation of the glider. The motor glider was transported disassembled on a car trailer. It took several minutes to assemble the Mücke (mosquito). The engine was started like a lawn mower engine - using a cord wound around the spinner of the propeller.

 

After the presentation of the glider in Mannheim, commissions from representatives of the Luftwaffe in the press wrote with glee:

However, the employees of the department, whose duties included the control of aircraft, in 1936 banned flights on this motor glider. When Dr. Hübner died in 1938, his Mücke was lost on the grounds of the brewery in Mosbach.

 

In 1983, this glider was discovered along with a monoplane manufactured in 1912. These gliders were then restored by the Kornwestheim Aviation Group and since 1984 these gliders have been on display at the Auto+Technik Museum in Sinsheim. The Mücke was one good example of what a self-built glider could be that could be flown in good weather. In accordance with this, his equipment was limited to only the most necessary instruments.

Mücke was restored using the surviving photographs. However, since the quality of the images was poor, some errors were possible during the restoration of the motor glider. On the dashboard, located in front of the pilot's seat, the following instruments were located:

 

• lever for controlling engines Kroeber M 4;
• altimeter: presumably here we are talking about an old instrument or a converted barometer. It is not known what altitude range was marked on the scale, but the maximum reading should be in the range from 3000 to 6000 meters;
• speed indicator: due to the low flight speed, for example, a speed indicator with a scale of up to 150 km / h could be installed;
• Bosch ignition switch. For the Kroeber M 4 type engine, two such switches were needed;
• Variometer: Since the Mücke was a motor glider, it was equipped with a variometer with a measurement range of -5 to +5 m/s. (for example Askania Lv7r);
• tachometer: the tachometer was driven by the drive shaft of the Kroeber M 4 engine and belonged to the equipment that was supplied with the engine. The tachometer was manufactured by Veigel. The engine speed was measured in the range from 0 rpm to 2500 rpm or up to 3000 rpm.
• the speed indicator jet was located in front of the fuselage.

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