First air-dropped bomb

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In 1912, during the Balkan War, Bulgarian Air Force pilot Christo Toprakchiev suggested the use of airplanes to drop "bombs" (as grenades were called in the Bulgarian army at this time) on Turkish positions. Captain Simeon Petrov developed the idea and created several prototypes by adapting different types of grenades and increasing their payload.^{[citation needed]} On 16 October 1912, observer Prodan Toprakchiev dropped two of those bombs on the Turkish railway station of Karaagac (near the besieged Edirne) from an Albatros F.II airplane piloted by Radul Milkov. This was the first use of an airplane as a bomber.^{[citation needed]}

After a number of tests Petrov created the final design, with improved aerodynamics, an X shaped tail and impact detonator. This version was widely used by the Bulgarian Air Force during the siege of Edrine. Later a copy of the plans was sold to Germany and the bomb, codenamed "Chathaldza" ("Чаталджа") remained in mass production until the end of World War I.

The weight of the bomb was 6 kilograms. On impact it created a crater 4-5 meters wide and about 1 meter deep.