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Originally Posted by http://en.wikipedia.org/wiki/Junkers_Ju_87
As a result, by the outbreak of World War II the Luftwaffe had 336 Ju 87 B-1s on hand.[31] The B-1 was also fitted with "Jericho trumpets", essentially noise-making propellers with a diameter of 0.7 m (2.3 ft).[32] This was used to damage enemy morale and enhance the intimidating effect of dive-bombing. After the enemy became used to it, they were to be withdrawn. The devices also caused a loss of some 20-25 km/h (10-20 mph) through drag. Instead some bombs were fitted with whistles installed on the fin of the bomb to produce the noise after release.[33]
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Shameless copy'n'paste from wikipedia's ju87 page