MAP: Crimea
WEATHER: Clear
TIME: 12:00PM
FUEL: 100%
WEAPON LOAD OUT: DEFAULT
RAD: OPEN
SC: STAGE TWO AT 8,700ft
POWER: 110% THROTTLE for ~1min past over heat msg, cut to 103% 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 TTC data
Here is a comparison of IL2 to the real world ROC data
Here is a comparison of IL2 to the real world MP data
SUMMARY
Rarely do we get such detailed real world data as we do with this Tempest Mk. V test at Mike Williams sight! So this analysis has a few more references to real world data than you will find in other analysis I have done.
As you can see in the graphs the in-game Tempest Mk.V has a slightly better ROC at all altitudes above 2,500ft. Which is why the TTC values are also slightly better. At 15kft the ROC error results in a 9% better ROC than real. i.e.
GAME TEMPEST Mk. V @ 15kft has an ROC of ~3000fpm
REAL TEMPEST Mk. V @ 15kft has an ROC of ~2750fpm
Percent error = 100 x abs[(real-game)/real]
Percent error = 100 x abs[(2750fpm-3000fpm)/2750fpm]
Percent error = 100 x abs[-250fpm/2750fpm]
Percent error = 100 x abs[-0.090909090909090909090909090909091]
Percent error = 100 x -0.090909090909090909090909090909091
Percent error = 9.0909090909090909090909090909091%
Percent error = ~9 %
The IL2 simulation goal is 5%, thus the TEMPEST Mk. V ROC is almost 2 times that!
As for the manifold pressure gauges, Devicelink is in ata and the RAF gauges use lb/sq.in. I could not find a formula to convert between the two so I came up with one from an old WWII conversion chart I have. Therefore, take the manifold pressure values with a grain of salt. Which should not be hard to do in that Oleg has stated they are just for show.
Here is a link to the full analysis
Tempest Mk V 110% with WEP
Here is a link to the track file
Track File
Here is a link to the real world data
Mike William's Tempest V Performance Data