The Osprey is a tilt-roterrotor which takes off as a helicopter but flies like a plane. It is known for it's nasty downwash which can knock people off their feet and even wreck helipads.
Its rotors are a compromise: larger than a plane's propellorpropeller but smaller than a helicopter's rotor. Its weight must be supported on a smaller swept area (higher disk loading). This means a more concentrated downwash. Is my reasoning correct?
Edit: it seems that my physics reasoning is correct. Sophit's link compares, quantitatively, disk area and disk loading between an Osprey vs helicopter of similar mass.