problém s teplotou TAT
PříspěvekNapsal:20 srp 2010, 10:52
Dobrý den přeji všem :-)
při svém poletování jsem narazil na problém s teplotou TAT ve vyšších FL. problém je popsaný detailně níže tak to tady nebudu rozepisovat. Převzal jsem to z jednoho fóra. http://www.chocolatesoftware.com/forum/ ... ic.php?t=2
I gave this an extensive trial and can\'t reproduce your problem Cry However, I did find something that might be the cause of your problem.
I set up FSHost to send out the \'clear skies\' weather every 120 seconds (I have noticed in the past that if the weather isn\'t sent out at least every 5 minutes then FS tends to forget and reverts to its own setting).
Then I set up a default FSX 747 to fly HDG 270 at 310 KIAS (on autopilot) and proceeded to monitor KIAS, GS, TAT, EPR, N1 and EGT at 20,000ft, 25,000ft, 30,000ft and 35,000ft.
The results with FSHost \'clear skies\' weather are:
Altitude:FL20, FL25, FL30, FL35
KIAS: 310, 310, 305, 285
GS: 436, 479, 520, 542
TAT: +40, +45, +51, +54
EPR: 1.12, 1.10, 1.06, 0.96
N1: 59.2, 67.8, 79.9, 93.6
EGT: 550, 597, 633, 669
What puzzled me here was that I couldn\'t maintain a KIAS of 310 at the higher altitudes and had to reduce the autopilot settings to the KIAS given above. I ignored that at first because I normally use FS9 where maintaining KIAS 310 is not a problem at higher altitudes and just thought that it was something MicroSoft might have changed in FSX (and I haven\'t done any extensive performance tests in FSX yet).
The results with FSHost weather switched off and FSHost weather switched off are (I used the same speed settings for the autopilot so that the results would be comparable):
Altitude:FL20, FL25, FL30, FL35
KIAS: 310, 310, 305, 285
GS: 403, 435, 463, 473
TAT: -3, -9, -16, -25
EPR: 1.12, 1.10, 1.06, 0.96
N1: 54.9, 62.0, 71.1, 81.5
EGT: 437, 448, 446, 442
The things I note when comparing the results from FSHost Weather to native FSX weather is that
- the ground speed is considerably higher with FSHost weather
- the TAT is positive with FSHost Weather and increases with altitude whereas in FSX Native the TAT decreases with altitude
- EPR is equivalent
- N1 is higher with FSHost Weather (and doesn\'t decrease as in your original post)
- EGT is significantly higher with FSHost Weather (and above 25,000 ft was showing \'red\' on the gauge).
What I deduce from this is that FSHost is sending out the wrong TAT (increasing with altitude rather than decreasing) and the engines are responding according to their simulation algorithm taking account of altitude, ambient temperature (and therefore air density?).
Whatever the problem is I am sure it is linked to the TAT that FSHost sends out (Russell will tell us that I am completely off track :-) )
Existuje nějaké řešení jak se toho zbavit. Nikde na fórech jsem řešení nenašel. Možná jsem špatně hledal... Používám FSX, win XP sp2, FSInn.
Předem děkuji za odpovědi.
R.H.
při svém poletování jsem narazil na problém s teplotou TAT ve vyšších FL. problém je popsaný detailně níže tak to tady nebudu rozepisovat. Převzal jsem to z jednoho fóra. http://www.chocolatesoftware.com/forum/ ... ic.php?t=2
I gave this an extensive trial and can\'t reproduce your problem Cry However, I did find something that might be the cause of your problem.
I set up FSHost to send out the \'clear skies\' weather every 120 seconds (I have noticed in the past that if the weather isn\'t sent out at least every 5 minutes then FS tends to forget and reverts to its own setting).
Then I set up a default FSX 747 to fly HDG 270 at 310 KIAS (on autopilot) and proceeded to monitor KIAS, GS, TAT, EPR, N1 and EGT at 20,000ft, 25,000ft, 30,000ft and 35,000ft.
The results with FSHost \'clear skies\' weather are:
Altitude:FL20, FL25, FL30, FL35
KIAS: 310, 310, 305, 285
GS: 436, 479, 520, 542
TAT: +40, +45, +51, +54
EPR: 1.12, 1.10, 1.06, 0.96
N1: 59.2, 67.8, 79.9, 93.6
EGT: 550, 597, 633, 669
What puzzled me here was that I couldn\'t maintain a KIAS of 310 at the higher altitudes and had to reduce the autopilot settings to the KIAS given above. I ignored that at first because I normally use FS9 where maintaining KIAS 310 is not a problem at higher altitudes and just thought that it was something MicroSoft might have changed in FSX (and I haven\'t done any extensive performance tests in FSX yet).
The results with FSHost weather switched off and FSHost weather switched off are (I used the same speed settings for the autopilot so that the results would be comparable):
Altitude:FL20, FL25, FL30, FL35
KIAS: 310, 310, 305, 285
GS: 403, 435, 463, 473
TAT: -3, -9, -16, -25
EPR: 1.12, 1.10, 1.06, 0.96
N1: 54.9, 62.0, 71.1, 81.5
EGT: 437, 448, 446, 442
The things I note when comparing the results from FSHost Weather to native FSX weather is that
- the ground speed is considerably higher with FSHost weather
- the TAT is positive with FSHost Weather and increases with altitude whereas in FSX Native the TAT decreases with altitude
- EPR is equivalent
- N1 is higher with FSHost Weather (and doesn\'t decrease as in your original post)
- EGT is significantly higher with FSHost Weather (and above 25,000 ft was showing \'red\' on the gauge).
What I deduce from this is that FSHost is sending out the wrong TAT (increasing with altitude rather than decreasing) and the engines are responding according to their simulation algorithm taking account of altitude, ambient temperature (and therefore air density?).
Whatever the problem is I am sure it is linked to the TAT that FSHost sends out (Russell will tell us that I am completely off track :-) )
Existuje nějaké řešení jak se toho zbavit. Nikde na fórech jsem řešení nenašel. Možná jsem špatně hledal... Používám FSX, win XP sp2, FSInn.
Předem děkuji za odpovědi.
R.H.