You are right, the siren was limted to the B series had a small proppler that made the sound while diving but later on (at about B3 / B4 series) the germans found that the enemy had gotten used to it so they removed it. And made a smaller one that where on the bombs it self.
Last edited by BadByte; 09-10-2009 at 06:18 PM.
Reason: Corrections
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