Hi Mikael,
thank you for you quick response! Yes, the surfbee has the additional air propeller, but I don’t think it helps with the vegetation issue in the water. But it is a nice addition for maneuverability, at least I would think so. Ocean alpha has the SL40 but the other USVs on your list are all using a propeller drive (as far as I know).
I didn’t know that a jet drive is so sensitive. Is that normal and are “only” small stones a problem or could floating vegetation be a problem es well?
Are there any other types of drive on the market that are used in USVs?
Thanks,
Rana