One diesel powered aircraft what was a familiar sight around North Sea was Blohm & Voss BV 138.
Odd sounding,3 motor flying boat was seen and shot down on occasion by allied fighter pilots,I recall reading somewhere about allied fliers being picked up from dinghies by one of those.
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Here is one of British first attempts at all metal aircraft-Beardmore Inflexible.Note the size with people standing next to it.
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What is that ring around the BV138 on the hoist? Sub detection electronics?