A simple slide valve with outside admission provides a lead of 3 mm, a maximum port opening of 18 mm and a cut-off at 62% at the out-stroke (i.e. at the crank end). The ratio of the connecting rod length to the crank radius is 3.7. Find the valve travel, steam lap and the angle of advance. If the exhaust lap is 12.5 mm, find the percentage of stroke at which release and compression will occur.