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Table 1 Geometric dimensions of the ducted tail rotor

From: Numerical method to compute acoustic scattering effect of a moving source

Rotor
Radius 297 mm
Number of blades 11
Solidity 0.4951
Twist angle −12°
Tip speed 74.6 m/s
Airfoil NACA23012 (r/R = 0.35 ~ 1.0)
Duct
Tip clearance gap 0.01R
Inlet radius 0.2R
Diffuser length 0.7R
Diffuser angle