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Hirth HM 500
The Hirth HM 500 was a German four-cylinder air-cooled inverted inline engine developed from the Hirth HM 504 in 1938. Although developing the same output of the HM 504 (105 hp) and keeping the same capacity and bore, the HM 500 was a very different engine; the new HM 500 had a one-piece "closed" crankcase〔The HM 504 had a three part crankcase〕 for simplified manufacture.〔The time consumed to build an engine passed from an average 1775 minutes on the HM 504 to 945 minutes with the new HM 500〕 The new cooling system reduced cylinder temperatures considerably (15 °C less), and the fuel consumption was also reduced. The HM 500 carried a twin-magneto instead of the two separate magnetos as on the old HM 504. All these changes made that the HM 500 resulted a 12% lighter than the HM 504 and the front surface a 37% less than the previous HM 504.〔Flugmotor Hirth HM 500, Luftfahrt International Nr 6, Dec. 1974〕
Otherwise the HM 500 continued the typical Hirth use of built-up crankshafts and roller-bearings for crankshaft & connecting rods (Hirth patents) as well as magnesium-alloy crankcases which made Hirth engines so popular in the 1930s.
Due to low fuel consumption and excellent reliability, the HM 500 was chosen as the powerplant for the Bücker Bü 181.
==Applications==
* Bücker Bü 181
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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