Length overall25 ft / 7.62 m Beam7.5 ft / 2.29 m Draft4.5 ft / 1.37 m Displacement4.4 tons approx  

Length overall24 ft 3 in / 7.4 m Beam8 ft 10 in / 2.7 m Draft3 ft / 0.9 m (propellors) DisplacementCirca 3 tons  

Length overall12.5 m / 41 ft Beam2.5 m / 8 ft 2 in Draft1.47 m / 4 ft 10 in Displacement3,600 Kg / 7,934 lb  

Length overall19 ft / 5.8 m Beam6 ft 2 in / 1.89 m Draft1 ft 6 in / 0.5 m Displacement   

Length overall28 ft 3 in Beam8 ft 1 in Draft5 ft Displacement4.5 tonnes  

Length overall19 ft / 5.8 m incl spars Beam7 ft / 2.1 m Draft3 ft / 0.9 m Displacementcirca 2 tons  

Length overall25 ft / 7.62 m Beam8 ft / 2.43 m Draft2 ft keel plate up, 4 ft keel plate down Displacement