PART 1II-HANDLING
(ii) Rudder trimmer. The rudder trimmer is awkward to
operate but is effective at high airspeeds.
(c) Airbrakes
The airbrakes are effective and will open fully at any speed.
They make the aircraft less pleasant to control laterally.
At speeds above 460 knots buffeting may be severe. When
descending with the airbrakes out, throttles closed, the rate of
descent is high and altimeter errors will be considerable.
Before closing the airbrakes, the angle of dive should be
reduced.
(d) Changes of trim
Increase in power Strong nose-up
Increase in speed Strong nose-up
Operating flaps, under- Negligible
carriage or airbrakes
WARNING.- Because of the strong nose-up change of
trim with increase in speed, elevator forces
must be trimmed out up to the maximum
speed attained and pull forces must be
applied with care. It is possible to cause
excessive G loading by flying the aircraft
out of trim.
59. Endurance
If it becomes necessary to fly for best endurance, the
following broad rules should be applied:-
(a) If at 25,000 feet or above, maintain height.
(b) Below 25,000 feet, with 300 gallons or more remaining,
climb to 25,000 feet.
(c) Below 25,000 feet, with less than 300 gallons, use only one
engine and do not climb.
60. Flying at reduced speed
Reduce speed to 170 knots. At this speed handling is
easier if 1/3 flap is used. 45
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