Ditto!
We have a swift nest under the guttering of our house and you can hear the "slap" of the wings against the wall as they come into land (the only time swifts do land incidentally). Their wingspan is surprisingly large when you see them up close and, for an instant, motionless, spread against the wall before disappearing into the nest - much larger than swallows or martins. Amazing fliers - amongst my favorite of all birds and, of course, they herald the summer.
Last evening was my first sighting of a small group spiraling up to sleep (they'll typically spiral up to 10,000 ft or so before sleeping on the wing - waking up at around 2,000 ft!) - haven't heard the "slap" yet though