Tell us something we don’t know.

   / Tell us something we don’t know. #4,383  
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   / Tell us something we don’t know.
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#4,388  
I recently went through the USS Drum, a WW2 submarine. Powered by two stroke diesels. That itself not unusual. They had a crank on top and the bottom though. That’s unusual. The piston on the top crank meets a piston from the bottom crank and diesel fuel is injected at the right time for ignition. No cylinder head to speak of.
 
 
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