Well engineered coaxial airscrew offers advantage in efficiency to airplane’s propulsion system. However modern approach on designing coaxial propellers is based on analysing and semi-empirical enhancing of already existing geometries. Present study provides realised in code and validated method for computing thrust and power coefficients for low and medium loaded airplane’s coaxial airscrew.

New approach is based on combination of elder approaches on aerodynamic calculation of coaxial airscrew and on aerodynamic calculation of highly loaded airscrew. The idea is then realized with implementation of convenient computational schemes and validated through comparison with full-scale experiment. Close agreement of calculations and experiment is found in areas of low and medium loads.

Present study is used to demonstrate the potential of such approach, as it only points out the way and necessity of further research.