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Old 08-31-2017 | 08:35 AM
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do335a
 
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Originally Posted by av8tor1977
Ah yes, but horsepower is never the whole story. TORQUE! Larger diameter props turning slowly are far more efficient. That engine makes 3 horsepower, but at only around 3000 rpms, so it has a ton of torque and would turn a huge prop.

AV8TOR
Agreed.

Horsepower is really a sort of useless number which is good only for impressing those who don't know.

It's an arithmetic calculation. Horsepower = torque x RPM

So go stick that 3 hp MDS .61 on your bicycle and see how fast it grinds to a halt. No torque.

It's good for high revving, free revving racing engine applications where a high torque low revving engine would be slow to rev up and down. One giant, single cylinder going really slowly with high torque would not get you accelerating very fast. Perfect application for that is the engine in a steamship.
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