@jynn-n-tonic You can solo defeat any skellie ship absolutely risk free with a bit of practice.
Raise sails to 50%, then get close enough to them so that you can land a harpoon shot on their rear. Using a mixture of reeling in (Mouse2) and harpoon locking (R), get your two boats into a never-ending spiral, with you a modest distance behind them. If it's positioned right, the harpoon will keep them from getting a shot on you. Do a hard reel to turn them if they look like they might be close to getting one.
Once you're in the death spiral, your number 1 priority is maintaining that harpoon distance, and recognizing when positioning/angles might cause the hook to release. You can't be on it 100% of the time and expect to win, but you need to get a feel for how long you can step away from it to do tasks, balanced against how much extra reeling in you'll have to do to get back into that position after the task.
With a mix of relaxing the harpoon and reeling it in you'll be able to give yourself a firing position on the enemy ship with zero risk of them firing back.
It can take some time to sink them the first few times while you're futzing around with the harpoon, but once you've got it, they go down quick.
...I just noticed this post is two months old, but it's still on the first page so I guess I'm replying anyway.