Submarines!
Good point!
Spaceman; thanks for the heads up on the new marine application. I was not aware of that (no surprise, not aware of a lot of things!). Back when I used to get Wooden Boat Magazine it was explained that gas motors were best in applications where power was applied in varying levels over short periods of time and diesels excelled in applications where motors were run in a steady state for the most part. I think this applies to a lot of engine application whether on land sea or air (or under the sea as the case may be).
When it came to exotic power plants for yachts and what not turbines were the go to engine. Amazing to see pics of a 80 foot yacht on plane powered by a couple or three turbines.
Guess we diverged a bit off topic.