Hi Kevin4,

Your retrieval craft looks promising. We built a couple of flat bottomed barge type hulls from RCM plans back in the early 70s and had a ball putt-putting around the farm pond sitting under an oak tree sipping cool ones while the 30 min epoxy was drying back at the house.
I started to lay out a barge type of hull, but this time instead of air props, I figured maybe an inboard E-Motor with Forward and Reverse control. would be better. Forward would get it out to the plane, and Reverse would allow it to back in between the pontoons. I figured to secure a long stiff wire off the stern with a hook and a one to two inch hook on the end. Back in under the nose until the hook hit the pontoon crossbar. A little more power would cause it to ride up and over coming down behind it. Forward motor would snug it up and then the plane could be towed in. Sounds feasible but I have no experience with inboard E-motors and submerged props. That calls for a little more investigating unless some guys have some rhoughts on usable motors and throttles and such. Maybe Hobby Lobby is a good place to seek help.