Whirlybird (New Feat 3.5)

[Amnoriath]

I think there is mechanical hole here that needs to be explained aside from the off flavor of this feat. This feat allows periods of flight of 10 ft per attack sacrificed but they can still hover if they choose not to give up any while not having a flight speed? I also don't understand the big strength requirement when this is a feat more of agility than strength.
The question is what do you want this feat to functionally do that would still allow the orc double axe to be useful?