Fig. 16 Propellor hub Gnome Le Rhone 'Monosoupape' (single valve) B2 9 cylinder rotary engine of WW1. See other images from this source in Gnome Monosoupape aircraft engine manual . 1917
Propeller and Gnome Monosoupape rotary engine on a Bleriot XXVll, a WW1 World War I era plane. Hangar 2 / H2 The first World war in the air. On display at the