I was not able to find an acceptable solution for electric sailboat. The use case is unique and I found most sellers provide preexisting off the shelf motor solutions adapted poorly to the use case or engineered solutions not properly addressing the real world need. The solution if it existed would be 95% power generator and only 5% motor usage. I am not an electronics engineer but a software engineer, I do have some knowledge about BLDC inner workings from experience. I thought a controller regeneration feature could work nicely for powering and generation but I was wrong about that. I assumed a low rpm motor could be driven from propeller dragging through the water. Motors are typically 5,000 rpm or so requiring gearing of 2:1 wasting power and even so 4 knots of speed is required to even start any generation. I have learned a little about generation technics of coil sets cutting in at different speeds, this led to the idea of motor design where individual coil circuits are also managed in the controller to enable optimal charging.
I have thought of in drive line generator as well as the BLDC electric motor to overcome the limitation with charging at low speed that is critically important, not a very elegant solution though, I wanted to see if anyone here has ideas or knowledge applicable to the issue.