MAP: Crimea
WIND: Off
TIME: 12:00PM
FUEL: 87% to obtain 84gal. UK
WEAPON LOAD OUT: DEFAULT
RAD: N/A Auto
POWER: 100% THROTTLE for ~1min past over heat msg, cut to 95% till msg goes away than back to 110%
ROC TEST METHOD:
The ground start method begins at a stop on the runway with the brakes on. The time to climb (TTC) stats when the brakes are released. The pilot completes a normal takeoff with rapid gear and flap retraction. The airplane is allowed to accelerate at low altitude to a speed somewhat below the speed for best climb speed (BCS). The pilot then performs a fairly abrupt pull-up and attempts to stabilize on the BCS schedule at the lowest practical altitude. Once stabilized on the climb schedule the pilot will adjust speed as the airplane climbs so that the schedule of best-climb speed is maintained as the altitude increases. The check climb ends when the rate of climb drops below 100 feet per minute or when a pre-established maximum altitude has been reached. Depending on the plane type, the time it takes from brakes released to lift off vary from about 20 to 40sec for a fighter. For graphing purposes, and to give the in game plane the best chance of meeting it's TTC values I removed the time between the brakes released and lift off (i.e. ROC > 0). This can cause a shift in the TTC times at alt by about 20 to 30sec.
RESULTS
Here is the summary table
Here is a comparison of IL2 to the real world ROC data Spitfire J.L.165 on 8th Oct 1943 and 1st Feb 1944
Here is the percent error between IL2 and the real world ROC data 8th Oct 1943
As you can see the in-game Spitfire has a lower ROC than it should at all altitudes
Here is the percent error between IL2 and the real world ROC data 1st Feb 1944
As you can see the in-game Spitfire has a lower ROC than it should at altitudes above ~5,200ft
SUMMARY
Avoid dog fights above 5,000ft!
Especially with a Bf-109K-4 at 17,388ft! In that the in-game 109K-4 1.80ata has an ROC that is 26% better than it should be at that altitude, and the Spit IX 25lb. has an ROC that is 6% worse that it should be, which results in the 109K-4 having an unrealistic 32% advantage in ROC!
Here is a link to the full analysis
Spitfire IX 25lb 100% 84gal. UK with WEP
Here is a link to the track file
Track File
Here is a link to the real world data from Mike Williams web sight
SPITFIRE J.L.165. 8th Oct 1943.
SPITFIRE J.L.165. 1st Feb 1944.