[ilikepi]

The keel of a modern sailboat does provide "righting moment" to help keep the boat upright, but it's also used to provide hydrodynamic lift in opposition to the sails so that the boat can sail somewhat upwind. These two goals have to be balanced against each other and against performance in the context of mass and friction.

I suppose though a drone has more flexibility in design parameters by not having people and people-related supplies on board.