All in a Flap
NO! - is very unfair and unhelpful to a genuine question.
From the PA28 Archer 111:
'The gross weight of the Archer 111 with power off and full flaps is 45 KIAS. With flaps up this speed is increased by 5 KIAS'.
'In high winds, particularly in strong cross winds, it may be desirable to approach the ground at higher than normal speeds with partial or no flaps'.
The advantages of flap;
1) They allow a lower nose attitude improving the forward vision at various speeds, particularly useful when approaching to land.
2) Owing to the increased drag they allow a higher power to be used giving to the benefit gained from the increased propwash such as an enhanced fin/rudder, tailplane/elevator and also lift, lift increase is marked with most twin props.
3) Reduced approach speed of 1.3 the stall, owing to reduction in the in the stall speed with flaps deployed.
4) Reduced float during the hold-off
Disadvantages of flap.
1) Owing to the changes in the lift/drag co-efficient the aircraft is less stable in pitch,roll and yaw.
2) Less power over drag is available.
3) less range in pitch owing to the increase in angle of attack induced by flap.
Therefore in normal conditions the benefits of flap are clear but in turbulent conditions greater skill in control is required. To maintain the approach path or should a go-around be required say because of windshear then the ability to resist sink and/or to climb is impaired and requiring greater changes of power.
Last edited by homeguard; 4th Oct 2009 at 17:08.