[Nick Beale]

A document of 17 September 1941 from the RLM's "Abt. Chefing. Verb. Ing." makes a number of points about using the SD 2 at night, including Luftsprengpunkten (which I take to be air bursts) arising from rapid acceleration and turning toward the target during low-level attacks.

Also, "When dropping from 600–1500 m in a turn to better recognise the target, apart from air bursts the SD2 [plural] become stuck in the Vemag. (The Vemag in use are intended for low-level flight, straight ahead) … The ballistics of the SD 2 from medium altitudes (1000–2000 m) are currently being established by [Department] LC 7. From experiences to date with one Vemag 90 from 1500 m a surface 300–400 m long by 90 m wide can be covered."

Source: Bundesarchiv RL 7-3/715, Verwendung von Bomben und Zünder (1941)