Image:B6N2 mec turning prop.jpg

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B6N2_mec_turning_prop.jpg (507 × 281 píxeles, tamaño do ficheiro: 13 KB, tipo MIME: image/jpeg)


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Nakajima B6N2 before starting the engine. The mechanic is manually turning the prop, to prevent hydraulic lock. A hydraulic lock occurs in a cylinder when it gets full of oil and the connecting rod attempts to displace it. Liquids are not compressible, so it will bend, or possibly break the connecting rod. This used to be a real problem in radial engines with a bottom cylinder, the oil would run down into the lower cylinder. This is why you see radials being "pulled through" by hand before starting the engine.

www.ijnafpics.com

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Public domain This photographic image was published before December 31st 1956, or photographed before 1946 and not published for 10 years thereafter, under jurisdiction of the Government of Japan. Thus this photographic image is considered to be public domain according to article 23 of old copyright law of Japan and article 2 of supplemental provision of copyright law of Japan.
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