This might be of interest, I can also recommend his Hardest Day one as wellIn order for the bomb to work properly it was dropped from a height of 60ft, essentially a ball hair's breadth above the water, and at night. At times the aircraft were flying lower on the run in to Germany. P/O Geoff Rice had to turn back when his mine clipped the water and was ripped off as he approached the Dutch coast.
The Mohne lake has a turn in it before the dam becomes visible and the Eder has has a nasty ninety degree turn along with a steep descent over the surrounding hills. What isn't shown in the film is the number of dummy runs that had to made on the dams in order to try and get to the right height and distance for dropping. Meanwhile the Germans are throwing everything at the aircraft. In my humble opinion a spectacular feat of flying.
The fact that they could do all this at all was testament to the testicular fortitude of the crews from the UK, Aus, Can, US and NZ as well as Chadwick's masterpiece in the form of the Lancaster. Many crews were thankful for its agility.
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