Anhedral and ducks
OK guys, here is an odd one to exercise the aerodynamic brains. My wife breeds ducks and wildfowl (as well as driving helicopters). She asked me: "Why do ducks when they are making a glide approach to their water ski landings, and before they lower the undercarriage, sweep their wings forward and carry considerable anhedral. Surely anhedral is laterally destabilising and unlikely to increase lift". Er.....right.