This was a great solution for me. Wanting to put floats on my little Parkzone Sport Cub I researched the various techniques offered in videos on line to add a water rudder. Reviews of the HobbyZone float set emphasized the limited cross-wind ability without a water rudder.

I decided to use a spare 9-gram reverse servo, waterproofed per on-line videos, and ordered this water rudder, a spare part, for the Apprentice S. It was fairly simple to make a hole in the float (solid foam) for the little servo, add a wood transom so I could attach two landing gear clips. A short piece of pushrod tubing fit the clips and the rudder shaft perfectly, also solved the problem of controlling height. Just cut it to fit.

The rudder assembly is first class, spring loaded to kick up if it hits an object in the water. I did not notice any out-of-balance condition on the water or in the air although I did not add weight to the opposite float. It steers the airplane in the water very well and you can run the airplane up onto the bank without worrying about the rudder. Neat!

The HopbbyZone float set fits several airplanes, with the water rudder added, they work very well.