N-2: ... To kill the excess weight that had plagued earlier types, the bomb bay, its doors, and the bomb release gear were removed, and changes were made to the control panels. The gaps were replaced by lighter wood parts which reduced weight, allowing heavier armour protection for the crew. The N variant was the most heavily armoured Dornier variant.[86] The improvements enabled a top speed of 525 kilometres per hour (283 kn) (an increase of 25 kilometres per hour (13 kn)) and a reduction from 15,000 kilograms (33,000 lb) to 12,500 kilograms (27,600 lb), which increased ceiling height to 9,500 metres (31,200 ft).
Source:
https://en.m.wikipedia.org/wiki/Dornier_Do_217
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