I was playing with Floppy the other day, when I noticed my teammate building a peculiar boat, it had a center piece and 4 other pieces on other sides, they were not connected to the middle more of a distance away (I will include the screenshot, just adding a bit more description) I was wondering if it considered a Sky boat since it technically isn't being supported by a prop. It's all welded together. But, it is all in the water, Unfortunately I am at school at the moment, and the screenshot will have to wait till later.
If all the props are touching the water or have something to make it float underneath it, then it's not a skyboat(even if they are welded). A skyboat is when a prop is floating above the water level without touching the water at all. (At least its what I consider a skyboat)
See that is where I have the problem, I slept over my friends house so the screenshot will have to wait till tonight. It is suspended in the air on the water, it's quite a debatable topic.