Potez 28

Potez 28
Renault powered Potez 28
Role	Long range record aircraft
National origin	France
Manufacturer	Henri Potez
First flight	1926
Number built	2

The Potez 28 was a French aircraft designed in the 1920s to set distance records, built in both sesquiplane and monoplane versions. Only two were completed but both set several long distance records.

The Potez 28, known also as the Potez 28/2 or the Potez 28 G.R. (Grands Raids or long distance flights, a standard French description of such types) was a close relative of both the Potez 25 and the Potez 25 G.R., all single engine sesquiplanes. In its original biplane form it was particularly like the latter, though strengthened and somewhat enlarged with an upper wingspan increased by 19% to allow for the weight of extra fuel. Unusually for such a large machine, it was a single bay biplane, with two spar wings. The lower wing was both shorter and narrower (55%) in chord than the upper, resulting in it having only 36% of the area. Pairs of interplane struts leaned outwards and diverged toward the more widely separated upper wing spars. The upper wing was supported over the fuselage by further pairs of outward leaning struts from the upper fuselage, converging to its spars.

The fuselage of the Potez 28 was flat sided, with rounded decking and two open cockpits placed well behind the upper wing. There was a cut-out in the trailing edge of the upper wing to improve the pilot's field of view. Large external supplementary fuel tanks could be carried below the fuselage to extend the range. The sesquiplane was powered by a 410 kW (550 hp) Renault 12Kg engine, driving a two blade propeller. At the rear the fin was small and roughly quadrantal, topped by the horn of the balanced rudder. It had a fixed tail wheel undercarriage with single main wheels mounted on vertical, streamlined, shock absorbing legs attached to the lower fuselage. These were hinged on trailing struts to the outer lower fuselage and on inner struts to its central lower underside.

...
Wikipedia