Exhaust augmented cooling is used on my Rocket as well (but that's going to be a different thread). Concerning the blade effect on ram pressure, it's real. I tested this years ago on my Hiperbipe (link below). The inlet pitot was a 3 inch diameter tube attached to the airbox with a hose clamp. http://www.airport-data.com/aircraft/photo/000576349L.html This allowed me to adjust the distance from the prop easily. I confirmed that the closer the inlet was to the blade, the higher the MP. This was repeatable. It should be noted that I placed the inlet well off center to get as far out on the prop arc as possible. The Rocket is similar, with the center of the inlet well out of the root area at 14 inches.