The Mathis 42-Cylinder Engine
Compiled by Kimble D. McCutcheon
Published 1 Dec 2019

The Mathis 42-cylinder liquid-cooled radial was pictured and briefly described on the back cover of AEHS Torque Meter Vol. 1, No. 1.
A recent resurgence of interest in the engine has resulted in us returning to the source material we accumulated back in 2001.


Below are Mathis 42 engine images and correspondence with the U.S. Army Air Corps. This material is part of U.S. National Archives Record Group 342, RD No. 2438, Folder "Matam 42-Cylinder."


The following patents appear to describe Mathis 42 construction and innovations.






News of the Mathis 42 appeared again after WWII