Comments: One of the more peculiar looking early WW1 aircraft was the Royal Aircraft Factory FE8, which was powered by a 100 HP Gnome ("Monosoupape", or single valve) engine in a pusher configuration, which necessitates the left hand thread of the propeller. Prior to the development of the gunfiring interrupter mechanism the advantage of the pusher configuration was to allow a machine gun to be fired from the forward cockpit without hitting the propeller. This very graceful 4 bladed propeller is characterized by a very thin, lightweight design and small dowel reinforcement of the laminations within the blade. All 4 junctions at the hub show the effects of normal expansion and contraction of wood grain in perpendicular laminations (see below).
An inherent quality of wood is its inability to expand and contract in laminations that are oriented perpendicular to each other.