The Avia M 337 is an inverted six-cylinder air-cooled inline engine. It was developed by the Czechoslovak company as a six-cylinder derivative of the four-cylinder M 332 engine, going into production
Right side view of a Walter M337; the front cylinder is hidden by the engine cowling
The Zlín Z 43 is a Czech four-seat light aircraft. A development of the two-seat Zlín Z 42, it is a low-wing monoplane. A developed version, the Zlín Z 143, remains in production.
Avia M 337
…Zlín 142 Zlín Z 43 Data from Jane's All The World's Aircraft 1980-81…
Zlin 43 Repulogep
A Luftstreitkräfte Zlín Z-43 at Preschen Air Base
A destroyed Z 143 Air Tiger at Sri Lanka Air Force Museum