Table 2 δ*-Optimal propellers.

Comparison of optimal propulsion efficiency, Embedded Image (×103), obtained using GA search for propellers with the same symmetries as in Table 1.

Aspect ratioTwo symmetry
planes
Skew-symmetryUnconstrained*
1:30.360
1:40.3500.4140.421
1:50.2900.3790.384
1:60.2330.3390.341
1:70.1920.2900.287
1:80.1660.2500.241
1:90.1400.2310.206
1:100.1320.2070.186
1:110.1110.1910.180

*Cylindrical approximation, ε = 0.

†This shape is used in Fig. 6.