Apollo XHS Series 13"D x 21"P RH Rotation 3-Blade Stainless Steel Thru Hub Exhaust Propeller by Michigan Wheel. Standard 3-Blade Recommended Boat Applications: Inflatables, Aluminum Consoles, Bass Boats, Flats Boats, Sport Boat Singles, Sport Boat Duals. Apollo Large Diameter propellers are great for heavier applications that require the increased blade area. Common to the entire Apollo line, the Apollo Large Diameter 3-Blade features CAD designed high-performance blade geometry. Apollo propellers are highly polished, ultimate performance, stainless steel wheels.