Make part collide only with water

Hello everyone, I have a boat which uses a gigant flat part welded to it for moving, the whole boat is massless. The problem is that the part collides with other things and doesnt let the boat get to the port. I have tried using collision groups but I dont know how to add water to those.

Thanks for reading.

Why isn’t the gigantic Part the same size as the boat? If you showed some pics or a link we could tell exactly what you are referring to.

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Because the boat is like a weird shape and the gigant part is square

Can’t you resize the huge part to be the same approximate size as the boat hull?

It is aproximate, but there is still patts of it that can break the game.