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Howyou get that page from ww2.dk? i don't see that file in miscellaneus index
Range doesn't matter much when you are bombing your neighbours! Whereas the ocean is a big place, a naval plane by definition needs good range to be effective. The Stuka gets my vote, as stated it was the definitive dive bomber for most of the war.
They might not have flown straight and level and flown a "zig-zag" during their search.75 mph average speed. That sounds pretty slow even allowing time for climb to altitude plus a few minutes for the attack.