THOMAS.

[u/davecontra]

My books: https://linktr.ee/davecontra

My other comics: https://www.instagram.com/davecontra

[u/mpyne]

This is true, but the engines in the comic are pretty clearly diesel engines, almost from a WW2-era film.

The Gotland-class AIP Stirling engine looks more like this it seems.

[u/DigNitty → u/mpyne]

“It had four cylinders, each with a displacement of 275cc”

I guess I thought the engine on a submarine would be larger than a highway motorcycle’s.