One other thought regarding scale motions that occurred to me after posting. Several years ago my friend Bob Hoey experimented with scale models of ravens (the birds). His models were full sized and had similar weights and inertias to the real birds. Even though they didn't flap, Bob's models looked eerily "alive" on a gusty, turbulent day. I'm sure it was the body motions that made them look so real. Bob even had occasion to soar with a gaggle of ravens, who accepted him without alarm. When Bob eventually ran out of lift and landed, one of the ravens landed along side and walked around the model, evidently wondering what was wrong with his new friend.

Dick