RE: SER1 Flat belt drives

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> 
> Why do long flat belt drives have a twist?
> 
> Smaller short ones don't. Flat belt drives on line shafting sometimes do and
> sometimes don't. I assumed this was simply to reverse the drive direction. 

Twisting them minimizes flapping with long runs. Since steam engines run equally well in both directions, you don't need to reverse the direction.

For internal combustion engines, my old farmer uncle says that you always twist the belt, once to reverse direction and twice if it needs to run the same way.


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