Speed graphs for Spitfire and Hurricane

[Kurfürst]

Originally Posted by 41Sqn_Banks

Some notes about the Bf 109 performance:



Anyone else noticed that the "reference graph" of the Bf 109 are factory/manual data? They were not achieved during the actual flight test because the Bf 109 in the test was under-performing.

The "reference graph" of the Spitfire is from a actual flight test, ironically again by a under-performing aircraft (speed dropped from 2800 RPM to 3000 RPM).

In addition WEP of the Bf 109 was only allowed (possible?) for take-off and up to 1-1.5km.

For comparison, the actual flight test (note the two lines, the bold one is the speed measured with the engine slightly down on power by about 50-60 PS, the thinner line is the measured performance re-calculated for nominal engine output guaranteed by engine manufacturer)

This has been achieved with 1.33/1.35 ata, which is our firewalled throttle setting in the game, without resorting to the 1-min WEP.



Condition of the airframe :

'The surface was painted after the serial production standard. The engine cowling was still rough, exhaust manifolds (DB-type, made at BFW) were lacking top cover.

2 Cowl- and wing-MGs were installed.
Antenna wire.
Undercarriage retracted, tailwheel out.
For air intake, see the reports drawings.

Radiator cooler flaps were 1/4 open. Coolant temperature observed as constant 90 degrees Celsius.
Oil cooler flaps were closed. Oil temperature observed as 62/82 degrees Celsius.'

IMHO the oil/coolant temperatures are also interesting. Coolant seems to boil rather too quickly in the sim.

The following paper is the official type specification for the Bf 109E. Manufacturer guaranteed these specs within +/- 5 % tolerance.