Integrated design is the main feature of advanced propfan design. From this point of view

methods adopted for aerodynamic and acoustic design of propfan are reviewed

commentson their application in propfan optimization are made

principles of selecting design parameters

such as power loading

number of blades

blade tip speed

airfoil section and shape of nacelle

are considered. The main objects of aerodynamic and acoustic optimization and the possible performance improvements obtained from the optimization are pointed out. The optimization of the blade tip sweep should be determined from both aerodynamic and acousticconsiderations

and the factors which should be taken into account in integrated or single optimization are indicated accordingly.