A certain combustion engine is air-cooled and has a cylinder constructed of cast iron (k = 35 Btu/h ft °F). The fins on the cylinder have a length of 5/8 in and thickness of 1/8 in. The convection coefficient is 15 Btu/h ft °F. The cylinder diameter is 4 in. Calculate the heat loss per fin for a base temperature of 100°F. Now you have two options to improve the heat transfer, first to increase the length of the fins by 1/4 in, or second to decrease the thickness of the fins by 1/16 in. What option will improve the heat transfer best and why?