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I have to go wtih the Swordfish, IMO it was the biplane that impacted the war the most.
With all respect to the sinking of the Bismarck and other successful attacks, I dare say the Stearman may have had a larger total impact on the war, but just my opinion.
The attacks on the Axis navies and the defence of the convoys of which the Swordfish played a critical role, was central and critical to every other allied action. Without victory at sea, and particularly in the waters around Europe, there could be no other activity by the allies. how can that not be the most important job for the allies. And whilst there were a plethora of aircraft that could do the job of the Stearman, ther were no othersa that could do the job of the Swordfish in 1939-41....
The impact that the Swordfish had on the battlefield is certainly critical but the Stearman's vital role in the war was training future pilots to fly...not many pilots made it to the front without having stick time in one of 'em.