are hinged surfaces on the trailing edge of an airplane wing
which, when deployed, increase the lift
) of a wing. They are usually used while landing to allow the aircraft to fly more slowly and to steepen the approach to the landing site.
Wing trailing-edge flaps extended on an unknown aircraft approaching London (Heathrow) airport.
- Plain flap - rotates on a simple hinge
- Split flap -
- Fowler flap - slides backwards before hinging downwards
- Slotted flap -
Flap, in (archaic) computer science jargon, refers to the process for unmounting a magnetic tape. When the system operator commanded a tape drive to unmount a tape, it would rewind the medium and then, as the tape unwrapped from the take-up reel, it would go "flap-flap-flap" as the feed reel spun down. Thus the term.