Abstract: An aircraft including an airframe having a fuselage which extends longitudinally, and having fixed wings including a main wing, a horizontal tail wing and a vertical tail wing. A propeller-rotor torque transmission has a bevel gear which transmits the rotation of an input shaft simultaneously to a propeller shaft and to a rotor shaft. An engine gearbox supplies the above-mentioned input shaft with rotationalal motive power. The aircraft further includes a propeller collective pitch controller, a rotor collective pitch controller, an engine power controller which controls the output of the above-mentioned engine gearbox for the purpose of changing the rotational speed of the input shaft, and a flight control system having a directional (yaw) control system which controls the flight direction of the aircraft by controlling the positions of the above-mentioned control surfaces.

Abstract: A golf club which is variable in its loft angle as an iron head to suit the mode of playing and which may be used as a putter by providing a putting face at the upper edge of the club head, comprisesa spline shaft projecting from the lower end of the club shaft and inserted into a spline hole in a sleeve provided at the back of the club head. The club head can be retained at a desired angle as the spline shaft engages with the spline of the hole. At the tip end of the spline shaft projecting at the mouth of the sleeve, a bush with a lever is provided so that as the lever engages with the mouth of the sleeve, sliding of the spline shaft inside the sleeve is prevented. To change the angle of the club head, the lever located at the tip end of the spline shaft is turned to the position of a slit provided at the mouth of the sleeve, and as the lever slips into the slit, the spline shaft is caused to slide in the hole to release the spline engagement.