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Album: German Submarines
Image: 196 / 473
Date: 2010-04-15 15:38:17
Tags: Bremerhaven, Germany, Submarines, Type XXI, U 2540

Experiment room (Sonar room)

In this room all equipment is combined that is required to detect enemy shipping.

1. Nibelung device
2. Group listening device
3. Gyroscopic compass (Master compass)
4. Cathode-ray direction finder
5. Sonar

A target could be located with the help of the group listening device over a large distance. If it was located loudly enough, the sonar could be switched over to listen and rotated to the direction found using the group listening device. If the propeller sound was strong enough to be located on the cathode-ray direction finder, some impulses were sent. In good conditions, three impulses where already enough to detect distance, course and speed of the enemy. Afterwards, those values could be used in the torpedo data computer and transmitted to the torpedos which were then fired.

Theoretically a target with a length of more than 60 m could be hit at a success rate of 95 %.