ConnClark -- Always interested in your input (anyone who identifies as Gamera is Okay by me); but I was not expecting that. Which is a good thing. It reminds me of Little Toot (a kid's book).
So how about this: In another time and place, maritime regulations required a licensed steam engineer onboard at all times. This made a grocery-getter impractical (unless self-licensed):
https://en.wikipedia.org/wiki/Naphtha_launch
Voila! an aluminum-hulled naptha-powered launch with really nice lines in 1892:
Yes, that Alfred Nobel.
Re: 2-stroke:
Quote:
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A single rotating overhead camshaft ran above the cylinders, parallel to the crankshaft. Eccentrics on this shaft actuated a transverse slide valve for each cylinder. The valve camshaft was driven at engine speed by gears from the crankshaft.
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