Standard armament was defensive in nature and involved a pair of dedicated machine gunners. The forward-most cockpit was given 2 x machine guns atop a trainable mounting and a further 1 or 2 x machine guns were installed near amidships (dorsally). For offensive-minded, light-to-medium bombing sorties the aircraft could be equipped with up to 660lb of conventional drop stores.
Performance-wise, the aircraft could reach speeds of 90-to-100 miles-per-hour out to ranges of 220 miles and an altitude of 16,000 feet.
The initial form offered was the Let.1 which carried 2 x Hispano-Suiza 8A engines and this was followed by the similar Let.2 model with Hispano-Suiza 8Ba engines. The Let.3 was introduced as more of a dedicated bomber form (to include the Bn3 night bomber) and relied on the same engines as the Let.2 variant. The Let.4 was a reconnaissance platform carrying 2 x Lorraine-Dietrich 8A series engines while the bomber variant, Let.5, was similar to this but carried the Lorraine-Dietrich 8Fb engine of 240 horsepower (each) instead.
Let.6 emerged as a large escort fighter and was given the official designation of "Ca.3" in French service. These were notable in their carrying of a 37mm cannon in the nose and being powered by 2 x Hispano-Suiza 8Be 8-cylinder water-cooled engines of 220 horsepower (each). The Let.6 was born from the Let.3 Bn3 night bomber but the type was more or less made obsolete by technological advancements had in the war.
The final notable mark became Let.7 which was another bomber development. This product reverted to the Lorraine-Dietrich powerplants.
The Let series bombers were not exported and quickly fell to history with the end of the war in November 1918.
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