Outboard engine design.
This is my first design with modular engines, so bear in mind it might not be the most efficient, but you can tweak the AFR as much as you want.
It's designed to run off a fuel tank on the boat, and two microcontrollers, one for a clutch and one for the engine itself.
It has two gearboxes, the top one having the reverse gear, and the bottom one having a faster top gear.
On my own boat I average about 15 knots in top speed, 9 knots in reverse and 9 knots in 1st gear.
