Liore et Olivier LeO H-257

Aéronautique Navale: xxx built total
The Lioré et Olivier LeO H-257 (most notably built as the LeO H-257bis) was a French twin-engine biplane float-plane torpedo-bomber/bomber developed by Lioré et Olivier during the 1930s for the Aéronautique navale (French naval aviation).

Development

Role: Maritime bomber, torpedo-bomber, and coastal convoy/submarine escort.Origin: Developed from the earlier LeO 25 land-based bomber series and the LeO H-254 seaplane variant.Production: The LeO H-257bis was the definitive and most widely produced variant, with around 60 units constructed (out of roughly 100 total H-25 series floatplane derivatives).Operational History: Entered service in June 1936, equipping various naval seaplane squadrons. They saw active patrol and escort duties at the outbreak of World War II in the English Channel and along the Atlantic and Mediterranean coasts, later serving under the Vichy regime before being phased out by late 1944.

Design

⚙ xxx specifications

Empty Weight
Gross Weight
Lenght
Wingspan
Height
Wing Area
Engine 130M
Engine 130C
Top Speed
Cruise Speed
Range
Climb rate
Ceiling
Armament
Crew
Crew4Length17.54 m (57 ft 7 in)Wingspan25.50 m (83 ft 8 in)Powerplant2 × Gnome-Rhône 14K radial engines (~870 hp each)Armament3 × 7.5mm Darne machine guns + up to 700 kg of bombs or 1 torpedo

Operational History

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