Aerial refuelling in WW2

Like those big whirling propellers on the front end of the aircraft. No single engine WW2 fighter would be able to refuel using either the probe and drouge or the flying boom system because of this. Modern jet fighters generally have their engines below or inside the fuselage to facilitate their refueling.
The original mid-air refueling tests were done with a single-engined propeller fighter. You just have to have a system that refuels through a receptacle on the top of the plane- probably behind the canopy.
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If you take a look at this picture, the refuelling receptacle on the F-16 (bottom aircraft) seems to be behind the canopy. A single-prop aircraft could refuel like that without much trouble. I don't know if the Tucano- the only single-prop combat aircraft still in production AFAIK- can refuel in mid-air, but it certainly looks possible with a flying boom. Probe-and-drogue is out, though.
 
They would certainly have problems with rendezvous points but not if the tanker flew with them to the refueling point.
Not needed. Just have the tanker orbit over a well-established geographical point. It's not like the aircrews were total idiots.
The B-29 used the same engine as the Thunderbolt. So long missions would not have exceeded run times between servicing.
No, they weren't. The B-29 used an R3350, the P-47 an R2800, like the F4U & F6F.
 
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