L.Opdyke French Aeroplanes Before the Great War (Schiffer)
Deleted by request of (c)Schiffer Publishing
Flight, October 23, 1909
FLYER SILHOUETTES FROM THE PARIS SALON.
Multiple-decked flyer defined by the makers as a "dix plan." In reality it properly belongs to the category of "five-deckers," since on either side of the centre body there are but five tiers of supporting surfaces. Each half deck, that is to say, each surface element on either side of the machine, is independently mounted on a longitudinal hinge, so that it can tilt out of the horizontal. All the decks are connected together, so that this tilting is reproduced simultaneously throughout, but in its present state the machine is unfinished in respect to the controlling mechanism. The object of thus pivoting the decks is to provide a means of balancing the machine by altering the "projected area" of the surfaces on either side. The air pressure on a plane is normal to its leading edge, and if the leading edge is not horizontal the vertical component of the pressure is reduced below the maximum. Normally, all the leading edges are horizontal, but this condition is disturbed in the event of loss of equilibrium, and the object of the De Dion system is to provide a means of maintaining the balance by the application of this principle, which is analogous to that of the dihedral angle in the Antoinette monoplane and to the description of which we would refer our readers for further reference to the subject.
Four chain-driven propellers are fitted. In front of the machine is a biplane elevator, while behind is a biplane rudder intersected by a horizontal fixed tail. The construction of the elevator outrigger resembles the Wright design.
Dimensions.-Span, 12 metres; supporting surface, 54.2 sq. metres; area of supplementary surfaces, 8 sq. metres; elevator span, 3 metres; chord, 0.7 metre; tail span, 2.6 metres; chord, 0.7 metre. Engine, 100-h.p. 8-cyl. De Dion. Propellers, four, two-bladed, wood, chain-driven at 450 r.p.m.