It seems I recall that outboards used to be rated for horsepower at the
crank, and now they are rated at the prop shaft. The net difference being
that a newer motor actually develops more power for the same rating than an
older motor.

Is that true?

If so, at about what time did motors start being rated at the prop shaft?

The reason I ask is that I just got my Whacko (Waco) on the water.

http://tinyurl.com/yqcs7

They way it is configured it is rated for a 50HP outboard. I have an older
Froce 50 on it that I picked up from Ebay. It runs great, but I was
wondering if shopping for a newer motor might get me a little better push.

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