here's a diagram of the opposed piston engine showing how the pistons and crankshafts operate. one crank leads the other by about 9 degrees if i remember correctly. they come together in the center for compression, injection of fuel and firing. the ones i ran had 10 cylinders and 20 rods and pistons. they put out 2,000hp apiece and weighed about 18 tons. they were quite noisy but after awhile you got used to it and it was kinda strange when they were shut down and all was quiet except for various pumps and compressors in operation. the ship was diesel electric just like a modern locomotive. each engine turned a generator which in turn sent it's power to the main motors. these were large electric motors of 5,000hp apiece which actually turned the screws and moved the ship through the water. there were six of the diesel engines, two in each of three different engine rooms.
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