Compression
This is a little off topic but valid.. 3 'planes take off to the north but the route is to the south. (A) takes off, leaves the flaps down, turns south then cleans up and accelerates. (B) takes off, cleans up the flap, remains at 0 flap speed, turns south then accelerates. (C) cleans up, accelerates to 250 Kts IAS, then turns south. Which has the best performance and burns the least fuel?
It's "C". Why? At 250 Kts IAS there is more ram air and therefore more power. "C" was further south and higher on less fuel than "A" & "B". More compression (ram) means more power. This was done in the late '70s.