Kazzukki

Fabo thank you very much for your special effort. Guys like you are few and far between! But then there is only one problem left for me. Please try to put a real weather value to TC (example EDDF realtime weather from ASE) and then calculate with that. Note the calculated N1 and start the simulator. Go to EDDF to that same runway and make the preparations. In my system there it goes wrong. If i use any value different then 29.92 at TOPCAT to calculate N1, TC's calculations doesn't match with NGXs'. Have you tried? So it's like my NGX is always at 29.92 no matter what altimeter is set in the simulator conditions (or what ASE has setted). Hope you follow. And yes - +40 value is allways the same, no matter flap position and weight. Of course TO, TO-1 and TO-2 +40 values are different. It is extreamly hard to explain but it seems that my NGX thinks allways that it is 29.92 preassure even through by pressing "B", it automatically sets baro to the one that ASE is using (real world one). Damn ;)

I'm using 2.70I am also getting limits over +40, just showed them as a reference. But there is differences between mine and yours.At first one you are saying: +64C 59646 OBS© 115-116 116 120 2706M 86.3%. I have limit up +65C 57019 OBS© 115-116 116 120 2611M 86.8%2nd you got: +54C 65215 CLIMB 143 143 144 1649M 87.6% and i got +50C 65531 CLIMB 143 143 144 1603M 88.7%3rd you got: +65C 56078 CLIMB 114 114 119 2725M 86.2% and i got +65C 54295 CLIMB 114 114 119 2637M 86.8%4th you got +47C 65181 CLIMB 140-141 141 142 1877M 88.6% and i got +43C 65366 CLIMB 141 141 143 1841M 89.7%So i confirm that i calculated these rates by using:TEMP 0C ALT two eight decimal eight zero (eightzero is showing smileyface so i write altimeter as nato alphabet) WIND 040/05 (04KT HW) ** FLAPS 5 (and) 10 ** TO ** DRY ** ** AIR COND ON ** ANTI ICE OFF **Summa summarum: am i doomed?

Ok lets take hmmm. EDDF with some random variables.Wind 040/05Temp +0 CAltimeter 28.80inHgRWY Condition DRYRWY 07LAll calculations below at Air Conditioning ON and Anti Ice OFF--------------------------------------------------Now let's calculate with different options:**************************************************Take-Off Weight: 44000 kgFLAPS 5Thrust Config: TO-------------------------------------------------OAT +0 96.5%D-TO +30 91.6%D-TO +36 90.7%D-TO +40 90.2%****************************************************************************************************Take-Off Weight: 65000 kgFLAPS 5Thrust Config: TO-------------------------------------------------OAT +0 96.5%D-TO +30 91.6%D-TO +36 90.7%D-TO +40 90.2%****************************************************************************************************Take-Off Weight: 44000 kgFLAPS 10Thrust Config: TO-------------------------------------------------OAT +0 96.5%D-TO +30 91.6%D-TO +36 90.7%D-TO +40 90.2%****************************************************************************************************Take-Off Weight: 65000 kgFLAPS 10Thrust Config: TO-------------------------------------------------OAT +0 96.5%D-TO +30 91.6%D-TO +36 90.7%D-TO +40 90.2%****************************************************************************************************Take-Off Weight: 44000 kgFLAPS 5Thrust Config: TO-2-------------------------------------------------OAT +0 90.1%D-TO +30 85.6%D-TO +36 84.7%D-TO +40 84.2%****************************************************************************************************Take-Off Weight: 65000 kgFLAPS 5Thrust Config: TO-2-------------------------------------------------OAT +0 90.1%D-TO +30 85.6%D-TO +36 N/AD-TO +40 N/A****************************************************************************************************Take-Off Weight: 44000 kgFLAPS 10Thrust Config: TO-2-------------------------------------------------OAT +0 90.1%D-TO +30 85.6%D-TO +36 84.7%D-TO +40 84.2%****************************************************************************************************Take-Off Weight: 65000 kgFLAPS 10Thrust Config: TO-2-------------------------------------------------OAT +0 N/A (Take-Off Weight (65000 kg) exeeds Perf. Limit Weight (64569 kg)D-TO +30 N/AD-TO +36 N/AD-TO +40 N/A**************************************************If you want some additional information, please let me know :)

But is that why they use the assumed temperature? What i mean is that in my TOPCAT (2.70), it makes no difference to calculated TO N1 rate that what I put to Take-Off Weight Box or flap settings. Just the Margin changes and there will be more or less options in D-TO. Same at TO-1 and TO-2. For exmpl. if i put 44000 kg in TOW, it will calculate 96.5 or +32 91.3 but if i change TOW to 70000 kg, it still shows 96.5 or +32 91.3%. I think that there is something that I dont know :D

Try calculating with TC's altimeter set to 29.92 and of course anti-ice and packs to match with simulations. Thats my problem. When calculating N1 rates, weight and flap settings are partly irrelevant as they only change the needed RWY margins ect. something else. Correct me if i'm wrong.

That much i know about those engines, that setting thrust +0.3% doesn't mean +0.3% rate :) well, but if we go to that line, then we dont need topcat because then we are using absolutely wrong de-rates and by then even more wrong runway margins. Now that is called a FAIL. Look at page 102 at this dockument.

FSX PMDG NGX -800 WL of course. I think that nowadays that is THE 737 sim aircraft which most of the people use (at least it provides simulation closest to real life of them all).

Superb mate! The whole AVSIM + FSNordic community owns you one for that!

Hello. Yes, differences between what i get in TC and what i get in the cockpit for start. It would be nice to see that will TC's calculations match with NGXs' in preassures different then STD (29.92/1013.25). If you gonna include some cockpit material to the video, please provide the testing conditions (temps, wind, altimeter and of course location). I think that for N1, the weight and flaps are redundant. So use some typical weight/flap configuration. Also it would interenting to see, that how TC's calculations match, when we take-off in a situation, where Air Conditioning (Packs?) are OFF.Yours faithfullyKasperi

I think that I didn't compleatly understand, what you mean. Do you mean, that by changing the "Altimeter" in Conditions field, there will be different range of assumed temperatures? For example: at LIPX 060/05, +0, 29.92 i get assumed temps from +30 to +62, but if i change Altimeter from 29.92 to 31.50, i get D-TO range from +30 to +67. Did you mean that? Also, i have to check with FSX that will the FMC always calculate the same N1 no matter what is the surrounding altimeter setting.

bakaman there are many many many people, who are interested to see that video! Also i cound link it to fsnordic.net if its OK to you. Please do a tutorial!

Seems to be to hard for you guys ;) No seriosly, this has an huge impact to realism, if things are what i suspect (hope im wrong)!

Hi! First I like to apologize my bad english!So my problem is this:I start a flight, let's say from LPMA to EDDF. I start from CLD AND DRK (as always) and i do all the preflight procedures correctly but when it's time to do some performance calculations with TOPCAT, i ran into a strange problem. TOPCAT seems to calculate TO-Rate correctly only, when i set Altimeter to 29.92 inHg from TOPCAT's Take-Off menu. QNH is set correctly at the cockpit but if i dont use value 29.92 inHg or 1013 hPa at TOPCAT's "Conditions", the calculated N1 doesn't match with the value that NGX had calculated. For example:LPMA 010/07KT +14 QNH 1027 hPaUsing Flaps 5 and TOW 56 t. Air Conditioning ON and TO-1.At these conditions, TOPCAT calculates N1 93.5% but NGXs' CDU calculates 93.8%. This same, about 0.3-0.8% difference between TC's and CDU's calculations comes at all possible TO / assumed OAT conditions. Only way to make these two (2) different N1 rates to be the same (what TC calculates), i have to set TC's "Conditions" Altimeter-setting to STD (29.92/1013) before calculating take-off performance. When this is done, TOPCAT calculates correctly in nearly all situations. Conversely if i enter a pressure under 29.92 inHg, like 29.50 to TC, it calculates 94.1%, which is now even bigger that CDU's calculated value. This just makes me wonder that either TC cannot co-operate with any different pressure/altimeter settings than 29.92 inHg/1013 hPa, or NGX uses only STD pressure to calculate N1 rates so i have to manually set STD pressure to TC before calculating.Any ideas?