To fly off water you will definitely want the 46 AX or other ball bearing 46 (such as the Thunder Tiger Pro 46). You will need the extra power to help break the "suction" affect of the water flowing past the bottom of the floats. Bernoulli's principle will not be denied. Flying off water is an entirely different art, and you will need instruction.

Most beginners learn to land by dropping the throttle, and letting the ground stop their decent. This technique will not work on water. To land on water, you MUST learn to control the attitude of the plane and allow the plane to sink slowly until the floats contact the water. You must continue flying the plane until its safely on the water, otherwise the floats will be driven below the surface, and the plane will nose over.

You must also take extra precautions to prevent water intruding into the electronics. You must take extra care to ensure all the wood is sealed. Water intruding below the covering WILL soften the balsa, and things will break.

Find a local club, talk to them, and good luck!

Brad