(under subclass 24) Propelled aeronautical machines sustained by their buoyancy relative to the air, 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 paddle wheels on machines having also sustaining wings, see this class, subclass 9.
(2) Note. For machines sustained by paddle wheels alone, see this class, subclasses 19 and 20.
