the dive siren was design to help slow the stuka in a dive so it can dive bomb better,, and to scare people too:),,,the desiner of the stuka was a little crazy like most inventors,,and said he sold his soul to the devil to design that plane,,,atleast that is what i heard about him,,he invented alot of the gull wings,,lots of good idea's,,but he said he got them all from hell,,lol