All Aero

The Duthiel-Chalmers engine rated 97 h.p. at 1000 r.p.m. had four horizontally arranged cylinders of 125 mm. (4.92 in.) bore and 300 mm. (11.81 in.) stroke. The total displacement was 898.04 cu. in., and the dry weight was stated to be 792 lbs., or 8.2 lbs. per rated h.p.