right outer tube 114 and a right inner tube 116 a support post 118 is shown the support post 118 is anchored to the kayak two examples of support post anchorage the bottom mounted anchorage and the top mounted anchorage are described below the clevis 104 is coupled to the top of the support post 118 the left blade 106 is coupled to the left end of the left outer tube 108 the right end of the left outer tube 108 is coupled to the left end of the left inner tube 110 with an adjustable connection the right end of the left inner tube 110 is coupled to the clevis 104 with a connection that allows for rotation about an axis concurrent with the central hub and approximately normal to the longitudinal kayak axis the right blade 112 is coupled to the right end of the right outer tube 114 the left end of the right outer tube 114 is attached to the right end of the right inner tube 116 with an adjustable connection as described below the left end of the right inner tube 116 is coupled to the clevis 104 with a connection that allows for rotation about an axis concurrent with the central hub and approximately normal e g normal or angled slightly forward of normal e g seven degrees forward of normal to the longitudinal kayak axis substantially normal to a plane of travel of a kayak e g a plane of a surface of water on which the kayak is traveling the shape of the left blade face 120 and.