Who invented the first gasoline powered boat?

The first boat powered by a petrol engine was tested on the Neckar river by Gottlieb Daimler and Wilhelm Maybach in 1886, when they tested their new "longcase clock" engine. It had been constructed in the former greenhouse (converted into a workshop) in Daimler's back yard.[1] The first public display took place on the Waldsee in Cannstatt, today a suburb of Stuttgart, at the end of that year.[2]

From Wikipedia:

http://en.wikipedia.org/wiki/Motorboat

Actually that is not surprising since they also invented the automobile.