Quote:
Originally Posted by Osprey
I like this bit 
Royal Aircraft Establishment at Farnborough
June 1940
Spitfire IA K.9791 with Rotol constant speed propeller
Me 109E-3 Werk-Nr 1304
Comparitive trials between the Me 109E-3 and "Rotol" Spitfire IA
1. The trial commenced with the two aircraft taking off together, with the Spitfire slightly behind and using +6 1/4 lb boost and 3,000 rpm.
2. When fully airborne, the pilot of the Spitfire reduced his revolutions to 2,650 rpm and was then able to overtake and outclimb the Me 109. At 4,000 ft, the Spitfire pilot was 1,000 feet above the Me 109, from which position he was able to get on its tail, and remain there within effective range despite all efforts of the pilot of the Me 109 to shake him off.
3. The Spitfire then allowed the Me 109 to get on to his tail and attempted to shake him off this he found quite easy owing to the superior manoeuvrability of his aircraft, particularly in the looping plane and at low speeds between 100 and 140 mph. By executing a steep turn just above stalling speed, he ultimately got back into a position on the tail of the Me 109.
4. Another effective form of evasion with the Spitfire was found to be a steep, climbing spiral at 120 mph, using +6 1/4 boost and 2,650 rpm; in this manoeuvre, the Spitfire gained rapidly on the ME 109, eventually allowing the pilot to execute a half roll, on to the tail of his opponent.
5. Comparitive speed trials were then carried out, and the Spitfire proved to be considerably the faster of the two, both in acceleration and straight and level flight, without having to make use of the emergency +12 boost. During diving trials, the Spitfire pilot found that, by engageing fully coarse pitch and using -2lbs boost, his aircraft was superior to the Me 109. |
Meanwhile on the other side of the Channel....
From : Kr.-Fernschr.Ob.d.L.,Führ.Stab Ia Nr.8092/40 g.K. (II)
(only to Lfl.3)
Subject : Comparison flight between Bf 109 E, Bf 110 C, Spitfire, Hurricane and Curtiss.
In the following the performance- and air combat comparison that has been performed
at the E-Stelle Rechlin between Bf 109 E and Bf 110 C and the captured enemy fighters
Spitfire, Hurricane and Curtiss shall be brought to acknowledgement. The results of
the comparison are to be announced immediately to all Jagd- and Zerstörer units under
command, to guarantee the appropriate air combat behavior in the engagements on the
basis of technical conditions.
The Bf 109 E type clearly outperforms all foreign planes:
Speed: the Spitfire is at 0 m by ca. 20 km/h, at 4 km by ca. 10 km/h, Hurricane and
Curtiss at 0 and 4 km altitude by ca. 60 km/h. A similar superiority of the Bf 109 E
exists in the climb performance as well. Climb times to 4 km:
Bf 109 E 4.4 min, Spitfire 5 min, Hurricane 5.6 min, Curtiss 5.2 min.
The plane Bf 110 C is speed-wise inferior to the Spitfire, superior to the Curtiss
and Hurricane. Regarding the climb performance is the Curtiss equal at ground level,
up to 4 km superior then inferior. Hurricane is inferior up to altitude 2 km, then
superior up to 6.5 km. Spitfire is equal at ground level, otherwise superior.
The best climb for Bf 109 E and Bf 110 C is achieved with shallow climb angle
and higher speeds than at the enemy fighters. It is wrong to climb away steep or climb
behind an enemy fighter with the same angle.
Before turning fights with the Bf 109 E type, it must be noted in every case, that
all three foreign planes have significantly smaller turning circles and turning times.
An attack on the opponent as well as disengagement can only be accomplished on the basis of existing superiority in performance.
For this the following suggestions are given:
The Spitfire and partly the Hurricane have two-pitch propellers.
Climbing away with the Bf 109 and Bf 110 must be done with the best climbing speed or
even higher speeds of about 280 – 300 km/h. On aircraft with two-pitch propellers with
low blade angle the engine will experience a very high over-revolution, and on the other
hand with high blade angle high boost pressure – therefore in other words, performance loss.
On sudden push forward on stick to below, the carburetor of the enemy fighters cuts out
due to the negative acceleration. This [evasive] measure is also recommended.
The rolling ability of the enemy fighters at high speeds is worse than that of the Bf 109.
Quick changes of the trajectory along the vertical axis cause especially with the Spitfire
load changes around the cranial axis, coming from high longitudinal thrust momemtum, and
significantly disturb the aiming.
In summary, it can be said that all three enemy planes types are inferior to the German
planes regarding the flying qualities. Especially the Spitfire has bad rudder and elevator
stability on the target approach. In addition the wing-mounted weapons have the known
shooting-technique disadvantages.
Lfl.Kdo.3/Führ.Abt./Ia. op 1
Nr. 3951/40 g.Kdos.
signed, K o l l e r
F.d.R.