FSHomeCockpit 23 Posted June 16, 2021 Share Posted June 16, 2021 I think I figured it out. On Perf page 2/3 you have to enter ISA. By default its set to +32. I change that in Celsius only for some reason? ex. I enter +20 and it converts it to enter an ISA value of 68 Fahrenheit. Then I can enter a flex temp (also only in Fahrenheit, ex. 90 flex) and flex is now working. Link to comment Share on other sites More sharing options...
CRJay 418 Posted June 16, 2021 Share Posted June 16, 2021 Strange that it would have that effect, that input should only really affect cruise and holding performance calculations (in the real plane). It is not actually ISA you are telling the FMS, but ISA deviation. So the 0C/32F default is correct in that the plane will assume ISA conditions. Entering 20 in that field would tell it that you expect ISA temperature plus 20 degrees Celsius on top. As far as I know, this should really not impact flex input. But at least you got it working . Could you try perhaps to change it, set the FLEX, and then change it back to the default to see if it has any effect on the FLEX you just set? Just curious. Link to comment Share on other sites More sharing options...
Hoffie3000 96 Posted June 16, 2021 Share Posted June 16, 2021 A user of the Microsoft Flight Simulator Forum has attached this screenshot. From the engine model it is for the CRJ900, maybe also CRJ1000. Is this helpfull in the Flex discussion? Please login to display this image. I set mostly AT 30, ActiveSky gives me the Temperature at flightlevel and I calculate the ISA dev. AT30 covers a wide temperature range. On my side the CRJ climbs as they should do. Link to comment Share on other sites More sharing options...
CRJay 418 Posted June 16, 2021 Share Posted June 16, 2021 It is really a matter of personal preference in the sim, since there is no access to everything needed to calculate proper assumed temperature (flex) v-speeds. The proper calculation includes considerations for runway length available, obstacle clearance, climb requirements and even maximum tire speed. These might all impact your V-speeds. So whatever you set in the sim, you will probably have V-speeds that are not accurate. At that point you are choosing whether you want to simulate putting in FLX temp but incorrect speeds or correct speeds and no FLX temp, so it is up to what you prefer for your sim experience. All a bit going into details of course. For example, the table you show is for sea level pressure altitude. It is one of about 9 tables ranging from -1000ft to 10.000ft pressure altitude. And another nine for packs on . Link to comment Share on other sites More sharing options...
Nicco54 24 Posted June 16, 2021 Author Share Posted June 16, 2021 4 hours ago, Hoffie3000 said: A user of the Microsoft Flight Simulator Forum has attached this screenshot. From the engine model it is for the CRJ900, maybe also CRJ1000. Is this helpfull in the Flex discussion? I had posted this screenshot coming straight from my manuals and I'm guessing someone copied and pasted it in the MSFS forum. This is for the CRJ 1000 but it's not what we actually use to determine the FLEX needed for takeoff. Link to comment Share on other sites More sharing options...
FSHomeCockpit 23 Posted June 19, 2021 Share Posted June 19, 2021 I've found with flex entered and enabled there is no flex detent in the throttle so actually matching n1 flex with the throttles is quite hard to do. Link to comment Share on other sites More sharing options...
KuntaKinte 210 Posted June 19, 2021 Share Posted June 19, 2021 FLX Temp only affects TO thrust. After you have entered a valid temperature, the N1 thrust indications on the EICAS are displayed in magenta and the target thrust changes from "TO" to "FLX". When you advance the thrust levers to the TO detent the FLX reduction is automatically applied. Link to comment Share on other sites More sharing options...
amahran 595 Posted August 14, 2021 Share Posted August 14, 2021 Am I the only one not seeing flex temp being applied when the thrust levers are moved to TOGA? I input the flex temp in the VNAV page and see the reduced thrust being applied on the EICAS, but during the takeoff roll the power exceeds the pink targets. It's almost as though it's entirely ignoring the FLEX setting. In the example below, the FLX target is 85 during taxi, but after advancing the throttle to TOGA, the thrust reaches 89.9% by the time I'm through 100 knots. Please login to display this image. Please login to display this image. Link to comment Share on other sites More sharing options...
mizra108 1 Posted August 14, 2021 Share Posted August 14, 2021 4 hours ago, amahran said: Am I the only one not seeing flex temp being applied when the thrust levers are moved to TOGA? I input the flex temp in the VNAV page and see the reduced thrust being applied on the EICAS, but during the takeoff roll the power exceeds the pink targets. It's almost as though it's entirely ignoring the FLEX setting. In the example below, the FLX target is 85 during taxi, but after advancing the throttle to TOGA, the thrust reaches 89.9% by the time I'm through 100 knots. Please login to display this image. Please login to display this image. Same here Link to comment Share on other sites More sharing options...
Crabby 28 Posted September 29, 2021 Share Posted September 29, 2021 On 6/19/2021 at 8:37 AM, FSHomeCockpit said: I've found with flex entered and enabled there is no flex detent in the throttle so actually matching n1 flex with the throttles is quite hard to do. When a flex temp is entered, the FADEC will command that at TOGA similar to Boeing aircraft. Link to comment Share on other sites More sharing options...
Sweet19blue 6 Posted September 30, 2021 Share Posted September 30, 2021 Yes, but not working… Pierre Link to comment Share on other sites More sharing options...
bburkley 2 Posted January 29, 2022 Share Posted January 29, 2022 On 8/14/2021 at 11:00 AM, amahran said: Am I the only one not seeing flex temp being applied when the thrust levers are moved to TOGA? I input the flex temp in the VNAV page and see the reduced thrust being applied on the EICAS, but during the takeoff roll the power exceeds the pink targets. It's almost as though it's entirely ignoring the FLEX setting. In the example below, the FLX target is 85 during taxi, but after advancing the throttle to TOGA, the thrust reaches 89.9% by the time I'm through 100 knots. Please login to display this image. Please login to display this image. Same issue, not working for me. Aerosoft - do you plan to address this issue? Link to comment Share on other sites More sharing options...
jstnj 102 Posted March 9, 2022 Share Posted March 9, 2022 Bump Link to comment Share on other sites More sharing options...
GEK_the_Reaper 233 Posted March 9, 2022 Share Posted March 9, 2022 The FLEX temp is taken into consideration BUT...the CRJ overshoots it then settles on the derated N1. This is a BUG already aquainted (in other threads). It is on the list and and we hope it gets fixed soon. Link to comment Share on other sites More sharing options...
jstnj 102 Posted March 10, 2022 Share Posted March 10, 2022 21 hours ago, GEK_the_Reaper said: The FLEX temp is taken into consideration BUT...the CRJ overshoots it then settles on the derated N1. This is a BUG already aquainted (in other threads). It is on the list and and we hope it gets fixed soon. where can we see "known issues" like this? Link to comment Share on other sites More sharing options...
GEK_the_Reaper 233 Posted March 11, 2022 Share Posted March 11, 2022 Just by searching other topics using some keywords. There is no bugtracking list on the forum. Link to comment Share on other sites More sharing options...
jstnj 102 Posted March 23, 2022 Share Posted March 23, 2022 On 3/11/2022 at 2:17 PM, GEK_the_Reaper said: There is no bugtracking list on the forum. Oh, I'm well aware of this as are others. A better question might be...is there even an internal one? ... Link to comment Share on other sites More sharing options...
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