Ok. Here we go I have a boat. 16.5 feet long, outboard with open front. 1987 engine 60 hp Evinrude, which won't start anymore?

Chop the top off and keep from the drive shaft down. Now the problem you have is that really the only engine you'll find that has a vertical rotating shaft is low power like a lawn mower engine. So attach your drive shaft to half of a car differential to convert into horizontal rotation.

From there you can attach any motor you want. I'm thinking your best bet is motorcycle wreckers. Cheap self contained motors with a wide range of power.

Light weight so you can move the whole motor to steer the boat, just like any outboard. Another alternative I came across in Thailand, but I think various asian countries use it. Attach any engine (even ordinary car engines) directly to a long drive shaft with your propeller directly on the end with no gearing or anything else.

The motor sits on an angle leaning backwards. This one is best understood with pictures:

Finally, for extra hacker points you could motorise whale tail paddles going up and down: metaefficient.com/boats/worlds-first-wav... Then you would win the game + 1 free internet.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.