Lioré-et-Olivier LeO 45 was a French medium bomber that was used during and after the Second World War.
It had been designed for the new Armée de l’air as a modern medium bomber capable of performing independent strategic operations, unlike the majority of previous French bombers.
First prototype, powered by two Hispano-Suiza 14AA-6 / Hispano-Suiza 14AA-7 radial piston engines.
The first LeO 45.01 prototype was redesignated, fitted with two Gnome-Rhone 14R engines.
Production version variously fitted with Gnome-Rhône 14N-48 / Gnome-Rhône 14N-49 or Gnome-Rhône 14N-38 / Gnome-Rhône 14N-39 or Gnome & Rhône 14N-46 / Gnome-Rhône 14N-47 engines
Twelve LeO 451T aircraft were redesignated, used as mail transport aircraft for Air France.
Post-war flying laboratory, 11 modified.
German-captured bombers modified for freight duty with seating for up to 17 troops, roughly 50 aircraft were modified.
Post-war conversion to high-speed transports and search-and-rescue aircraft, powered by two 895 kW (1,200 hp) Pratt & Whitney R-1830-67 engines, seating for 6 passengers, range 3,500 km (1,890 nm, 2,175 mi) at 400 km/h (215 knots, 250 mph) cruising speed, 40 modified.
Bristol Hercules II engines, one prototype left unfinished.
High-altitude version with turbo-supercharged Gnome-Rhône 14R engines producing 1,375 hp (1025 kW) each, 400 ordered, one prototype built.
The aircraft flew on 12 March 1939 but was later destroyed on the ground.
Post-war photo-reconnaissance variant, powered by two 1,600 hp (1195 kW) SNECMA 14R engines.
LeO 456 (LeO 451M)
Naval version for the French Navy, 68 ordered. Also known as the LeO 451M.