Fledermaus
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Regarding the cannon firing through the propeller shaft debate, the Messerschmitt BF-109E and some later models starting with those produced after the Battle of Britain, but not during it, had a 20mm cannon installed between the banks of the inverted Daimler V-12 and firing through the prop hub. It was able to do this because the prop was not directly connected to the engine crankshaft, but was rather spun by a reduction gear-box which offset the propellor upwards and put it in line with the cannon's gun barrel. Later some Messerschmitts used a 30mm cannon in the same place. The installation was not considered to be very effective as it was quite difficult to service and didn't allow the plane to carry much ammunition.
I hope that clears up any confusion my previous post may have caused.
Cheers and be well.
Evilroddy.
Indeed.