Design a single-reduction, spur gear-type speed reducer with all components. Specify the two gears, two shafts, four bearings, and a housing (with fasteners). This gearbox must fit into the condition shown below: A water turbine transmits 50 kW of power to a pair of gears at 4500 rpm. The output of the gear pair must drive an electric power generator at 3600 rpm. The center distance for the gear pair requires not to exceed 150 mm. Project Requirements: 1. Design the gearbox. Show all calculations, selection processes, and detailed analysis. 2. Make detailed component drawings for two shafts and the housing. 3. Demonstrate an assembly drawing for the gearbox.