der dritte Mann

elvigueserrante: Uboot type XXI. The key improvement in the Type XXI was greatly increased battery capacity, roughly triple the Type VIIC. This gave these boats great underwater range, and dramatically reduced the time spent on or near the surface. They could travel submerged at about 5 kn (5.8 mph; 9.3 km/h) for two or three days before recharging batteries, which took less than five hours using the snorkel. The Type XXI was also far quieter than the VIIC, making it harder to detect when submerged. View Larger

elvigueserrante:

Uboot type XXI. The key improvement in the Type XXI was greatly increased battery capacity, roughly triple the Type VIIC. This gave these boats great underwater range, and dramatically reduced the time spent on or near the surface. They could travel submerged at about 5 kn (5.8 mph; 9.3 km/h) for two or three days before recharging batteries, which took less than five hours using the snorkel. The Type XXI was also far quieter than the VIIC, making it harder to detect when submerged.

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