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Enthusiasts from around the world dedicated to the preservation and ritual flogging of the infamous Kawasaki 2-stroke Triples
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PostPosted: Sat Feb 04, 2017 3:18 pm 
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Joined: Tue Jun 07, 2011 6:37 am
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Location: Rio Rancho, New Mexico
http://www.asahi.com/ajw/articles/AJ201610140080.html

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........


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PostPosted: Sun Feb 05, 2017 11:54 am 
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Joined: Thu Jun 09, 2011 3:06 am
Posts: 4364
Location: PARIS FRANCE
Not flyable sadly.


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PostPosted: Wed Apr 12, 2017 5:34 am 

Joined: Fri Aug 19, 2011 3:15 am
Posts: 224
Location: Kingdom of the Netherlands
The Hien's engine was a licence-built Daimler-Benz DB601, but it was too sophisticated for the state of the 1940s Japanese industry. Both the Ha-40 and its derivative the Ha-140 were unreliable. Professor Suzuki devotes several chapters of his book "The Romance of Engines" to the Ha-40; Kawasaki compiled a report of their investigation into the Ha-40's problems during the war and Prof. Suzuki was fortunate enough to get his hands on a copy. One of the causes was incorrect heat treatment of the crankshaft, resulting in a troostite rather than martensite structure. Another was that Kawasaki couldn't achieve the surface roughness required for the crankshaft's roller bearings. Kawasaki tried to get a licence for the Bosch direct fuel injection equipment but failed, so a Mitsubishi system was fitted instead which had its own set of problems.
Aichi also obtained a licence for the DB601 but its version, known as the Atsuta, was just as bad as the Ha-40.
In the end the Ha-(1)40 engine plant was destroyed by a B-29 attack leaving Kawasaki with a pile of Ki-61 airframes without engines, so the engineers were forced to fit a Mitsubishi radial engine. The conversion was extremely successful and the "new" aircraft became one of Japan's best fighters of WW2, the Ki-100.


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