A chain sprocket delivers 110 hp to a shaft at a rotational speed of 1700 rpm. The sprocket has an outside diameter of 6 in and a bore diameter of 2.5 in. The sprocket is made from ASTM class 20 cast iron and has a hub length of 3.25 in. Design the key (length, width and height). Use SAE 1018 steel for the key if a satisfactory design can be achieved. If not, use a stronger key material. Assume a design factor of 3. After that, compute the maximum power capacity that could be transmitted by the key.