The Lioré et Olivier LeO 10 or LeO H-10 was a prototype French Naval reconnaissance aircraft built. Only one example of this two seat, single engine biplane floatplane was built.

Development

The LeO H-10 (H for ''hydravion'' or waterplane) was a two-seat floatplane designed for reconnaissance work from Naval vessels. It was an unstaggered biplane with unswept wings of constant chord that could be folded for ease of onboard stowage. The

interplane strut In aeronautics, bracing comprises additional structural members which stiffen the functional airframe to give it rigidity and strength under load. Bracing may be applied both internally and externally, and may take the form of strut, which act in ...

arrangement was unusual: outboard, there were conventional upright pairs but just inboard of these another pair ran diagonally in

Warren girder A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements, usually forming triangular units. The connected elements (typically straight) may be stressed from tension, compression, or ...

style, replacing the conventional

flying wires In aeronautics, bracing comprises additional structural members which stiffen the functional airframe to give it rigidity and strength under load. Bracing may be applied both internally and externally, and may take the form of strut, which act in ...

. The lower wing folded at a rear hinge on a short stub wing; outboard of the break was a single vertical strut. Central cabane struts provided an upper hinge so the wings, with their

trailing edge The trailing edge of an aerodynamic surface such as a wing is its rear edge, where the airflow separated by the leading edge meets.Crane, Dale: ''Dictionary of Aeronautical Terms, third edition'', page 521. Aviation Supplies & Academics, 199 ...

s folded downwards, leaned inwards over the

fuselage The fuselage (; from the French ''fuselé'' "spindle-shaped") is an aircraft's main body section. It holds crew, passengers, or cargo. In single-engine aircraft, it will usually contain an engine as well, although in some amphibious aircraf ...

when stowed. The fuselage of the LeO H.10 was a simple, flat sided structure with a

water cooled Cooling tower and water discharge of a nuclear power plant Water cooling is a method of heat removal from components and industrial equipment. Evaporative cooling using water is often more efficient than air cooling. Water is inexpensive and non ...

Lorraine 12D The Lorraine 12D, also referred to as Lorraine-Dietrich 12D, was a series of water-cooled V12 engines produced by the French company Lorraine-Dietrich. The first variant began production in 1917, and the engines were used to power bombers for th ...

V-12 engine A V12 engine is a twelve-cylinder piston engine where two banks of six cylinders are arranged in a V configuration around a common crankshaft. V12 engines are more common than V10 engines. However, they are less common than V8 engines. The fir ...

in the nose. Twin wooden floats provided its

landing gear Landing gear is the undercarriage of an aircraft or spacecraft that is used for takeoff or landing. For aircraft it is generally needed for both. It was also formerly called ''alighting gear'' by some manufacturers, such as the Glenn L. Martin ...

. Only one was built, flying for the first time in April 1923.

Specifications

References

{{DEFAULTSORT:Liore et Olivier LeO H-10 1920s French military reconnaissance aircraft Floatplanes H-10 Single-engined tractor aircraft Biplanes Aircraft first flown in 1923