not sure if there were "helicopters" in 1939-1940 period, but oleg already indicated they had intended to included some gyrocopter (autogyro) in BoB
so the answer is yes, it is possible, and i think is already included (presuming they finished that aircraft bug free in time, if not it should be in an update patch soon), and presuming you dont mind flying a gyrocopter instead of an helicopter
a little history on the topic:
Quote:
If we except Leonardo da Vinci drawings, the history of rotary wings goes way back. In 1784, Launois and Bienvenue, two French physicians, presented to Paris Academy of Science the model of "a device with propeller that could fly". On August 21, 1907, the Breguet brothers and professor Richet would test the first 4-rotor aircraft, that was able to hoover 1 meter above the ground. Sure, it could not really fly... yet !
Just after the first World war, a few pilots found that flying these strange fixed-wings machines could be somewhat dangerous, due to their incredible ability to stall and to kill their pilots.
Some of them decided to research aircrafts that could not stall at all - therefore making flight safer. We could name there in France Henri Mignet, whose "living wing" would prove to be a safe concept for conventional aircrafts.
But, in parallel, in Spain, Juan de la Cierva took another direction: he believed that a "rotating wing" would do the trick. And it did, indeed ! Juan would become, after many trials and prototypes, the founder of the gyrocopter aircraft category. He would cross the Channel in flight in 1928.
Development of the gyrocopter continued between the two wars, both in Europe and the USA. During WWII - an often forgotten history - they saw active duty, for instance as the mean for calibrating British radars, or as trailed observers on German submarines.
In parallel, the development of the helicopter, which did not saw anything really flying until 1937, continued as well.
Mainly for psychological reasons, the helicopter would then take over the gyrocopter for a good decade - military and civils alike not really understanding how a free-rotating rotor could, much more safely than a powered one, ensure the sustentation of an aircraft.
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ps: sorak, the MASH show is from the korean war period in the 1950's
this website has a good brief history on the topic, including differences between gyrocpters and helicopters
http://www.phenix.aero/PHE-1200.html