My free flight models do an upwind and downwind turn about once every 10 seconds in a continous circle. They just fly nice and even the whole way around other than LOOKING like they slow to a stop while nose first into the stronger winds.

My RC gliders do the same thing as long as I can avoid trying to "help" them. If I trim for a nice turn and just hold it the glider turns 'round and 'round all pretty and on it's own with nary a nose up or down cyclic response in the lot.

But I too wondered about the mass inertia thing and concluded that it isn't a factor because of the above.