User blog comment:Nachtide/Ask Nachtide Questions/@comment-6548012-20151230112757/@comment-26402117-20151231180336

3. Assuming the one in my window is unladen and the driveway is 5m wide, I'd say somewhere in between 8 to 12 m/s while gliding. (It seems to increase when the bird is landing and dip when the bird increases height tho).