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