Gnome Omega Rotary 7 Engine

Type: Rotary, 7 cylinders, monsoupape, air-cooled

Power rating: 37 kw (50 hp) at 1,200 rpm

Displacement: 7.98 L ( 488.5 cu in.)

Bore and Stroke: 110 mm (4.33 in.) x 120 mm (4.73 in.)

Weight: 78 kg (172 lb)

The first successful rotary engine is generally attributed to the American F.O. Farwell in 1896; but the French Gnome engine, developed by the Seguin brothers, was much more successful in bringing the rotary to a broad aviation market beginning in 1909. The original Gnome had two valves, with the inlet in the head of the piston and exhaust in the in the cylinder head. The monosoupape, as the name signifies, had only one valve in the cylinder head, eliminating a weak feature of the earlier design, and was the most numerous model during World War I.

This was the second type of rotary aircraft engine designed by the Seguins, and the artifact was to power an aircraft designed in 1910 by Charles M. Olmsted. It drove two pusher propellers through extension drive shafts and mitre gears. Scale model wind tunnel tests indicated that the design was practical, but lack of funds prevented completion of the Olmsted aircraft.