Figure 25
From: Investigation of the performance of a horizontal-axis dual rotor wind turbine

Cp versus rotation speed ratio rear rotor (S826) & (Eppler E63) to front rotor (S826) at various Nratio for CWT.
From: Investigation of the performance of a horizontal-axis dual rotor wind turbine

Cp versus rotation speed ratio rear rotor (S826) & (Eppler E63) to front rotor (S826) at various Nratio for CWT.