All Aero

A three-cylinder horizontal Duthiel-Chalmers engine, of the bore was 110 mm. (4.33 in.), the stroke 300 mm,
(11.81 in.) and consequently a total displacement of 524.1 cu. in., was rated 56.5 h.p. at 1000 r.p.m. This engine was stated to weigh 396 lbs., or 7 lbs. per rated h.p.