Water knifes (turn fins) with mounts for mid size RC Boats

This is a small turn fin design ideal for shallow water (the photo below is for demo only – actual mounting should be done as close to the side of the hull as possible, and should be 90 degree to the bottom – extensive testing is required to have it done right):

They are meant for mid size boats (35~50 cm overall length):

upgradeparts-rcboat-waterknife-verysmall

Another variation for small boats:

upgradeparts-rcboat-fin-vsmall