(under subclass 4) Aeronautical machines having provision for sustentation in part or entirely by aerodynamic action on airfoils in fixed relation to the machines, having also provision for sustentation or vertical lift by the downward thrust developed by rotating paddle wheels. These paddle wheels may also provide a part or all of the forward propulsion.
(1) Note. For machines sustained by paddle wheels alone, see this class, subclasses 19 and 20.
(2) Note. For airships partially sustained by paddle wheels, see this class, subclass 27.
