PART II-HANDLING
          
          33.   Flight planning charts
          
          (i)   The following flight planning charts for the aircraft, with-
                out and with wing drop tanks and external stores, show
                the range obtainable at various altitudes as well as the
                quantity of fuel remaining in the tanks, the time taken
                and the distance covered from take-off, at any stage of
                the flight.  Charts 1 to 5 are optimum range charts and
                give the recommended level flight I.A.S.  Chart 6 shows
                the range and other corresponding data obtained
                when flying without external stores at a higher
                over-all speed, the level flight stage being carried out at
                maximum continuous r.p.m. and increasing I.A.S. as fuel
                is used.  In this case the approximate mean cruising
                I.A.S. is shown against each curve.  These charts illus-
                trate clearly the advantage of flying at a high altitude.

          (ii)  The following table shows the allowances made in the
                charts and how the fuel is used for each stage of the
                flight.
                Taxying and take-off	...	...	 24 galls.
                In flight	...	...	...	241 (441) galls.
                Landing		...	30 )
                Unavailable	...	35 )	...	 65
                                             Total...   330 (530) galls.

                NOTE.--(a)  The figures in brackets apply with 2 x 100
                            gallon drop tanks.

                       (b)  Pending the introduction of modified wing
                            tanks the 35 gallons shown above as un-
                            available should be deducted from the total
                            of the wing tank gauge readings to ascer-
                            tain at any time the total available quantity
                            of fuel remaining, because the construction
                            of the wing tanks prevent the final 35 gal-
                            lons draining from them to the fuselage tank
                            at all but very low angles of attack.  Pro-
                            vided, however, a minimum of 30 gallons is
                            indicated by the fuselage tank gauge on
                            joining the circuit, ample fuel will be avail-
                            able for going round again and completing
                            the landing.

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