17.........The Me.109 was compared with a Spitfire LF.IX for speed and all-round manoeuvrability at heights up to 25,000 feet. Up to 16,000 feet the Spitfire holds a slight advantage when using 18 lb. boost, from 16,000 to 20,000 feet the Me.109 gains slightly in speed, and at heights above 20,000 feet the Spitfire again leads in speed to the extent of approximately 7 m.p.h. When 25 lbs.boost is employed in the Spitfire it is about 25 m.p.h. faster at heights below 15,000 feet and 7 m.p.h. faster at heights in excess of 15,000 feet.
18.........The climb of the Spitfire is superior to that of the Me.109 at all heights. It has a particularly marked advantage below 13,000 feet using 18 lbs.boost, and this is naturally more pronounced when using 25 lbs. boost. When both aircraft are pulled up into a climb from a dive, the performance is almost identical, but when climbing speed is reached the Spitfire slowly pulls away.
19.........Comparitive dives between the two aircraft have shown that the Me.109 can leave the Spitfire without any difficulty.
20.........The manoeuvrability of the Spitfire IX in this respect is greatly superior to that of the Me.109 and it easily out-turns the Me.109 in either direction at all speeds.
Rate of Roll
21.........Here again the Spitfire has a marked advantage at all speeds.
22.........The Me.109G has an inferior performance to the Spitfire in all respects with the exception of acceleration in a dive and the slight advantage in speed which it possesses at heights between 16,000 and 20,000 feet.