Hi @DLE_Marcon, welcome to the forum 
I imagine your components will have arrived by now, but just to respond to your question, our Weedless Propeller was specifically designed to reduce motor fouling when travelling through seagrass and the like, and should have substantially better performance in that regard when compared to our standard shrouded thrusters (especially if they’re being used without some kind of guard).
It’s perhaps worth noting that the keels of the BlueBoat hulls also help to deflect some seagrass before it even gets to the propeller region, which may be worth considering as a potential feature for your USV design, if it’s not already part of it