[kach22i]

How about this one?

Kawasaki Ki-61 Hien'Tony'
http://www.angelfire.com/fm/compass/K61.htm

In early 1945 one of 275 engineless airframes was fitted with the Ha-112 radial engine. Although a sudden lash-up conversion this produced a staggeringly fine fighter, by far the best ever produced in Japan. This aircraft, designated the Ki-100, was put into production with desperate haste. One of the first Ki-100 units destroyed 14 F6F Hellcats over Okinawa in their first major encounter - without loss to themselves. The easily-flown and serviced Ki-100 fought supremely well against Allied fighters and B-29 bombers to the very end of hostilities in the Pacific.

http://www.vectorsite.net/avhien.html

The Hien proved initially successful in combat against American fighters. As the war in the Pacific ground on, however, the Ki-61 found itself increasingly outclassed, but it soldiered on until the end of hostilities. This document provides a history and description of the Ki-61 and its radial-engine derivative, the Ki-100..............................By this time, the Hien was outclassed by American Mustangs and other late-model US fighters. In fact, when attacking B-29s Hiens often had to be protected by Ki-100s. Operations faded away as planes and pilots continued to fall in combat and fuel and spare parts dried up. By the end, the home defense units were no longer capable of posing a real threat to the Americans.

Guess not.........................................?