There are a growing number of lakes and inland waterways where traditional powerboats are not allowed. The solution is electric boats and the power can be generated to the batteries by sun cells or fuel cells. In Stockholm a ferry service with biogas/electric propulsion is under development and there are similar concepts elsewhere too.
Since the power is limited, an efficient hull is needed and what is nicer than to look back a hundred years, when the first powerboats were seen.
My boat is designed for a speed range of 8-18 knots, the latter with an optional diesel engine of 75 hp.
It is a dayboat with a convertible dinette, plenty of space to sit underway and a small galley under the sliding glass-top. She has a walkaround deck to starboard for easy entering and to avoid the inside corridor of vintage boats.
With an almost silent propulsion, this is the way to motor. With grace.