Tempest V supercharger anomaly

[CountZero]

Game specs for airplane say that supercharger should be switched abow 9500ft = 2900m.

 

In game when i test max speed of Tempest V i noticed that at 3000m and 3500m airplanes achives better speed with less lbs if supercharger 1 is used and not supercharger 2 as specs say, how is that posible ?

 

So from test in QM at Kuban autumn map:

 

3000m airstart, autopilot on, trottle 100% rpm 100% rads 0%, mix auto, trim default and supercharger 2 , i get ~9lbs, 3700rpm and IAS of 541kmh (tech chat shows emergancy)

3000m airstart, autopilot on, trottle 100% rpm 100% rads 0%, mix auto, trim default and supercharger 1 , i get ~6lbs, 3700rpm and IAS of 571kmh  (tech chat shows combat)

 

3500m airstart, autopilot on, trottle 100% rpm 100% rads 0%, mix auto, trim default and supercharger 2 , i get ~9lbs, 3700rpm and IAS of 541kmh (tech chat shows emergancy)

3500m airstart, autopilot on, trottle 100% rpm 100% rads 0%, mix auto, trim default and supercharger 1 , i get ~5lbs, 3700rpm and IAS of 554kmh  (tech chat shows combat)

 

so its faster at sup 1 and 6lbs then sup2 and 9lbs , at 4000m it starts to behave as expected sup 2 gives better speeds.

 

From extracted file in ...\luascripts\ai folder for caeroplane_tempest_mk_v_ser_2.txt:

 

    "// Тест в МСА, режим максимальный (3000/+9), топливо 100%, радиатор закрыт
    ////// MaxAltTAS = <float ALTITUDE>, <float TAS>
    MaxAltTAS = 0, 600
    MaxAltTAS = 1000, 633
    MaxAltTAS = 2000, 664
    MaxAltTAS = 3000, 662
    MaxAltTAS = 4000, 660
    MaxAltTAS = 5000, 687
    MaxAltTAS = 6000, 701
    MaxAltTAS = 7000, 693
    MaxAltTAS = 8000, 679
    MaxAltTAS = 9000, 656"

 

if i use this ias to tas converter https://aerotoolbox.net/airspeed-conversions/ with sup1 571kmh ias at 3000m i get exact same 662.8kmh tas that game file is saying it should have at that alt, so is then correct that sup 1 should be switched at abow 3500m (11500ft), and not as spec say abow 9500ft=2900m, or something is wrong with behavior of its supercharger at 3000m and 3500m ?

And then if this is correct behavior, how come airplane is on thouse altitudes mutch faster on lower lbs?

 

 

Edited October 3, 2019 by 77.CountZero

[Matt]

Those switch altitudes state when you switch gear in a climb at climb speed. In level flight you can get a higher manifold pressure in the lower gear than you would in a climb due to ram air.  And you don't benefit from ram air in the higher gear at those low altitudes.

 

So if speed is what you're after (or if you're climbing at high speed), you should add 500-1000 meters altitude to the recommended switch altitude (depends on supercharger used in the plane).

[CountZero]

ok thanks, thats makes it clear

[=362nd_FS=RoflSeal]

9500 ft supercharger switch for climb at 11 lbs boost.

At 9 lbs it is 11,000ft

for level flight it is ~10,500 and ~15,000ft respectively

[SCG_Tzigy]

little off topic - anyone knows what the S and M stand for... really hard time finding out...

[LukeFF]

4 hours ago, SCG_Tzigy said:

little off topic - anyone knows what the S and M stand for... really hard time finding out...

 

Standard and Moderate

[JtD]

M.S. and F.S. refer to Moderate and Full Supercharging, afaik.

[SCG_Tzigy]

Thx!!!!!!