Port crank chamber drum, including cam, cam gears, punch rods, etc. 5,225 Starboard crank chamber drum 3,440 Spark plugs (5) 450 Outlet water pipe 450 Inlet water pipe 360 Inlet gas manifold 1,700 Primary and secondary sparkers and wires 512 Balance arm with braces for same--starboard 1,040 Balance arm with braces for same--port 1,067 ------ Total 56,323 = 124.17 lbs. Starboard fly wheel 3,946 Port fly wheel 3,234 ------ Total weight of engine and fly wheels 63,503 = 140.00 lbs. Spark coil and batteries 6,800 Carburetor 3,751 Inlet gas pipe from carburetor to manifold 756 Gasoline tank 1,004 Water tank 717 Water circulating pump and shaft 807 Radiator 7,700 ------ Total weight of power plant 85,038 = 187.47 lbs. [p251] CHAPTER XI SHOP TESTS OF THE AERODROME