Keel designs that catch the wind or current to move naturally.
If you tell me more about your , I can narrow these down: Terrain type (open water, flooded timber, or dry fields)? Typical weather (dead calm or high wind)? Target birds (migratory divers or local puddle ducks)? buy duck decoys
More flexible and resistant to cracking in cold weather; see Heyday FlexFloat Portability Keel designs that catch the wind or current