PART 1II-HANDLING
(d) High-speed, low-level flying
During high-speed runs near the ground, if the aircraft is
out of trim (nose-up) and a heavy pull-force is applied for
the pull-out, excessive G may be induced, resulting in
structural damage. For this reason, stick forces must be
trimmed out up to the maximum speed attained and great
care exercised when applying pull-forces. If the angle of
dive near the ground is greater than 10°, the maximum
permissible speed is 400 knots. The angle of dive in ground
attack must not exceed 45°.
65. Aerobatics
Until experience is gained, the following speeds in knots
are recommended:-
Roll .. .. .. .. 260-280
Loop .. .. .. .. 370-380
Roll off the top .. .. .. 380-400
Climbing roll .. .. .. 390 plus
Stall turn .. .. .. .. 280-300
In manoeuvres in the looping plane, much height may be
gained or lost and an ample margin must always be
allowed for regaining normal flight. With experience, the
above speeds can be reduced considerably.
NOTE:-The negative G traps in the main tanks ensure a
supply of fuel for 45 seconds inverted flight; this
must not be exceeded owing to the possibility of
oil starvation. If a ventral drop tank is fitted,
aerobatics must not be carried out unless it is
empty. If wing drop tanks are fitted, aerobatics
are prohibited.
66. Descent
(a) Gliding
Glide at 170 knots at all heights for maximum range. The
distance covered in the glide will be approximately 2 miles
per 1,000 feet of height loss.
(b) Fast rate
Set 11,000 r.p.m. (12,500 asymmetric), airbrakes out, and
maintain 250 knots. The rate of descent will be 4,500-
5,000 ft. per minute. 49
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