We use to operate 47's on floats in another life....
One intersting fact was that you could afford a far greater rate of descent on entry into the water. I have first hand experience of seeing the entire float on my side below the water line with the associated 'popping' up of the machine as a result.
Entry into the auto was pretty much the same. The size and shape of the 47floats create lift over the nose section during the descent so the kit includes a set of spoilers mounted on the upper surface just forward of the doors, as well as a protector on the stinger that also acted as a surface to create a nose down moment.
47's were less forgiving to side slip with the floats as they acted as a surface area below the CoG exacerbating the slip.
One scary fact is that 'supposedly' there has been no factory demonstration of a successful auto to land in the 47. Successful meaning, without chopping the tail boom. Being a fairly low powered machine, our worst fear for young fella's was an overpitch on takeoff and an inadvertant contact of the float with the ground....... with the smallest amount of forward speed, this would cause a tucking under of the float bags and either a rollover of the machine or contact with the tail boom.....
P R nightmare.