[Leica] OT: why do bombs whistle?

[oliverbryk at comcast.net (Oliver Bryk)]

Air raids were very noisy events. Anti-aircraft weapons of different
calibers and firing rates, pieces of shrapnel from the 88mm shells,
incendiary sticks, the horns of ambulances and fire engines, collapsing
buildings, roaring fires, exploding bombs, etc. created acoustic
environments in which the sounds made by falling bombs did play a
significant role because they were dropped not individually but in numbers
that depended on the size and number of bombers. One could not really hear a
bomb that fell very close, only sense an air pressure. Occasionally one
would hear a bomb land but not detonate.

Oliver

PS: According to www.wikipedia.de, the Junkers Ju-87B "Stuka" had a small
wind-driven siren, nicknamed "Jericho-Trumpet" on each leg of its  landing
gear.