Flaps on take-off and landing

Flap extension does cause an immediate (manual flaps)
increase in lift, rotating the aircraft also increases lift
but the flaps seem to work better in the case of just
"jumping" a few feet because they also lower the stall speed
giving a slightly greater margin at the same energy level.



"Bob Moore" wrote in message
. 122...
| Jim Macklin wrote
| Flap extension reduces the stalling speed, often only a
few
| knots, but lift increases as does drag. The airplane
will
| balloon and slow very fast, the extra distance and
altitude
| gained is only a few feet, but if all you need is to
clear a
| 5 foot cattle fence or a 10 foot wide ditch, that is a
| technique that is useful.
|
| Can't create energy out of thin air Jim. You would clear
the
| same 5 foot fence just by increasing the angle of attack
and
| in both cases, glide a shorter distance if you were at
best
| L/D to start with.
|
| Bob Moore