Not the entire story I suspect since the different blade tip and root designs along with the effect of the fuselage shape will have an effect on the working area under the aircraft. This subject was raised at the ICAR Air Commission a few years ago. Some makers had mapped the downwash under certain aircraft but I don't think we got any further with it since the science had never been done for most types. I am happy to work under the intense downwash of the new types since it is the same power that is keeping me safe in the air.