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Old 12-02-23, 11:14 PM
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Originally Posted by madpogue
Doesn't a piston engine have multiple crank arms, that make up the crankshaft, that sits in the crankcase? Wouldn't that have been true even if the first reciprocating engines had electric starters rather than external cranks?

Good thing we're not fretting over musical instrument terminology.
I was incorrect on calling it a “crank arm” rather than a “crankshaft” but it is still encased in the crankcase. But you have the wrong terminology as well. The pistons are moved up and down on piston rods that are attached to the crank. A crank that is still in a crankcase.
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Old 12-03-23, 03:48 AM
  #77  
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Originally Posted by cyccommute
I was incorrect on calling it a “crank arm” rather than a “crankshaft” but it is still encased in the crankcase. But you have the wrong terminology as well. The pistons are moved up and down on piston rods that are attached to the crank. A crank that is still in a crankcase.
I was referring to the crank itself, not the connecting rods. The "crankshaft" is not a straight shaft. The sections of the crank that the connecting rods connect to are, of course, offset from the centerline of the crank.
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Old 12-03-23, 04:25 PM
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Originally Posted by madpogue
Doesn't a piston engine have multiple crank arms, that make up the crankshaft, that sits in the crankcase? Wouldn't that have been true even if the first reciprocating engines had electric starters rather than external cranks?
Unless your piston engine is on a stern wheeler. Then it would be a pittman arm. Or a steam locomotive, which has a main rod.
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