A two-cylinder Duthiel-Chalmers horizontal engine, rated 24 h.p. at 1200 r.p.m., had a 128 mm. (5,04 in.) bore, 130 mm. (5.12 in.) stroke, and a total displacement of 204.28 cu, in. This engine was said to weigh 132 lbs., or 5.5 lbs. per rated h.p.
Cylindrical sleeve valves in the cylinder head were operated mechanically. The cylinders were held by long studs passing through clamps over the cylinder head.
The water outlet and the spark plugs were located on top of the cylinder and the water inlet underneath. The crankshaft was fitted with a wire spoked flywheel, and the pistons were lubricated by special oil feeds run to the cylinder.
All Aero 