The power unit as claimed in claim 2, wherein one of said z-shaped hinge pieces to one side of said supporting tube includes an elongated slot through which said bolt and nut means project, said slot extending longitudinally parallel to the axis of said drive shaft to permit a slight adjustment in the angle between the drive shaft and the propeller shaft in the horizontal plane. The power unit as claimed in claim 2, wherein said supporting tube comprises an inner tube which terminates short of the end of the drive shaft, an outer tube fixedly mounted to said inner tube at the end adjacent the sleeve bearing said propeller shaft, a first ball bearing mounted within said outer tube and abutting the end of said inner tube, a cylindrical bush coaxially mounted within said outer tube in abutment with said first ball bearing, a second ball bearing concentric with said outer tube, positioned therein and abutting the end of said cylindrical bush opposite said first ball bearing, said drive shaft projecting through said first and second ball bearings, and a stop ring fixed to the interior of said outer tube, and abutting the end of said second ball bearing remote from said cylindrical bush for maintaining said ball bearings and said bush in position within said outer tube.Ĥ. The power unit as claimed in claim 1, wherein said hinge means comprises z-shaped hinge members fixed to the sides of said supporting tube and said sleeve at respective ends of said supporting tube and sleeve and extending longitudinally beyond the ends of said supporting tube and sleeve and bolt and nut means projecting through overlapped ends of said z-shaped hinge pieces defining a hinge pivot access between said hinge pieces to opposite sides of said supporting tube and sleeve, and wherein, said locking means comprises angles fixedly mounted to the confronting ends of said supporting tube and sleeve at the bottom thereof, and a bolt passing through aligned holes within said angle and bearing paired lock nuts on opposite sides of one of said angles to lock said ends of said supporting tube and said sleeve at a given distance from each other at the bottom, thereby locking the sleeve and supporting tube at axially inclined position with said rubber body flexing to meet the angular inclination of said supporting tube relative to said sleeve.ģ. A power unit for a hang-glider or the like ultra-light air craft said power unit comprising:Ī combustion motor, a drive shaft, means connecting said combustion motor to one end of said drive shaft, a propeller shaft connected to the other end of the drive shaft and driven thereby, the improvement comprising a supporting tube mounting said combustion engine externally thereof, means for journalling said drive shaft internally of said supporting tube, means for connecting said supporting tube to said hang-glider at the location of the center of gravity common to the hang-glider and to said power unit with said supporting tube extending in the direction of the movement of said hang-glider, a sleeve concentrically surrounding said propeller shaft and means for journalling said propeller shaft within said sleeve, a flexible coupling comprising a rubber body having a first end fixed to the other end of said drive shaft, and a second end fixed to one end of said propeller shaft, a propeller fixedly mounted to the other end of said propeller shaft, opposed hinge means connecting said supporting tube to said sleeve at opposite sides thereof, and locking means at right angles to said opposed hinge means connecting said supporting tube to said sleeve to lock said hinge means in a set angular position such that the force vector generated by rotation of the propeller is in the desired direction relative to the hang-glider.Ģ.
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