The Grainger 14D478 is a 14-inch diameter, 4-blade, aluminum propeller for small aircraft. It has a pitch of 78 inches and is designed for engines up to 200 horsepower. The propeller is manufactured from heat treated aluminum alloy for strength and durability. It uses a standard aircraft prop bolt circle and spacing for easy installation. The propeller blades are computer designed for optimal performance. This propeller provides powerful thrust while maintaining fuel efficiency. With robust construction and optimized blade shape, the 14D478 is well-suited for many light aircraft.