WW2 R.A.F. Squadrons generally consisted of 12 aircraft available, although there were operational variations. Depending on role, the squadron would be made up of 'A' Flight and 'B' Flight, each of 6 operational aircraft. On fighter squadrons, the Flights were sub-divided into sections, eg, Red Section, Blue Section, etc, of 2-3 aircaft, again depending on operational requirements.
Simple machines provide a vocabulary for understanding more complex machines. A simple machine is a mechanical device that changes the direction or magnitude of a force.
A lever is a simple machine that makes work easier for use; it involves moving a load around a pivot using a force. Many of our basic tools use levers, including scissors (2 class 1 levers), pliers (2 class 1 levers), hammer claws (a single class 2 lever), nut crackers (2 class 2 levers), and tongs (2 class 3 levers). It all depends on where the fulcrum point is as compared to the load point.