Traditional pontoons are big and cause a lot of drag. It would be nice to retract them like normal landing gear but they are just too big.
Has there ever been a seaplane with inflatable airbags instead? They way I imagine it is a lot like normal landing gear, with lowering struts from the wings or belly. But instead of wheels, it has a wound-up airbag that's unrolled and inflated.
I think this would save a lot of drag and weight, and I'm a little surprised that this apparently doesn't exist over the 114 years or so of airplane history. Is there something unfeasible about this concept? I suppose getting propeller clearance over the water is the biggest concern, but I would think slightly long legs on the landing gear would be sufficient and well worth it to save all that weight and drag from those big pontoons.
Edit: This is for the really small planes.