A gearbox is required to transmit 18 kW from a shaft rotating at 2650 rpm. The desired output speed is approximately 12 000 rpm. For space limitation and standardization reasons a double step-up gearbox is requested with equal ratios. If the maximum admissible distance between axes is 100 mm select suitable gears for the gear wheels and pinions. (you can use the charts at the end of the paper or other resources if you want to choose different modules). Calculate the Hertzian contact pressure between teeth flanks at the pitch point.