planevan 1 Posted December 1, 2021 Share Posted December 1, 2021 When I set takeoff power, (tested with all types of takeoff power) the N1 will increase to an acceptable power, but it will then slowly fall off to around 84% by the time I rotate. This results in longer than expected takeoff roll, and slower climbout. Are there plans to fix this bug? Link to comment Share on other sites More sharing options...
LesOReilly 314 Posted December 1, 2021 Share Posted December 1, 2021 15 hours ago, planevan said: When I set takeoff power, (tested with all types of takeoff power) the N1 will increase to an acceptable power, but it will then slowly fall off to around 84% by the time I rotate. This results in longer than expected takeoff roll, and slower climbout. Are there plans to fix this bug? Are you in the TO Detents? What did you setup for your performance numbers? Link to comment Share on other sites More sharing options...
planevan 1 Posted December 1, 2021 Author Share Posted December 1, 2021 39 minutes ago, LesOReilly said: Are you in the TO Detents? What did you setup for your performance numbers? "tested with all types of takeoff power" as in I used Max, TOGA, and everything in between. And there's no TO detent. I used the perf numbers from the tablet. Link to comment Share on other sites More sharing options...
LesOReilly 314 Posted December 1, 2021 Share Posted December 1, 2021 6 minutes ago, planevan said: "tested with all types of takeoff power" as in I used Max, TOGA, and everything in between. And there's no TO detent. I used the perf numbers from the tablet. TOGA is the TO Detent ... so the answer is yes.. I take it you also did not enter a flex temp? Link to comment Share on other sites More sharing options...
planevan 1 Posted December 1, 2021 Author Share Posted December 1, 2021 2 hours ago, LesOReilly said: TOGA is the TO Detent ... so the answer is yes.. I take it you also did not enter a flex temp? Tried with and without. I've been consulting a type rated CRJ pilot on the matter. I understand the line of questioning but when an airplane functions fundamentally incorrect, we do not need to be wasting our time with these questions. Link to comment Share on other sites More sharing options...
LesOReilly 314 Posted December 1, 2021 Share Posted December 1, 2021 38 minutes ago, planevan said: Tried with and without. I've been consulting a type rated CRJ pilot on the matter. I understand the line of questioning but when an airplane functions fundamentally incorrect, we do not need to be wasting our time with these questions. No I was trying to understand what you were doing to see if I could also recreate it .. but I will stop trying also create it in parallel (well once the update to the Marketplace version comes back) hope you get it solved for yourself.. Link to comment Share on other sites More sharing options...
CRJay 418 Posted December 1, 2021 Share Posted December 1, 2021 See here, same issue discussed. Link to comment Share on other sites More sharing options...
GEK_the_Reaper 233 Posted December 2, 2021 Share Posted December 2, 2021 @planevan @CRJay this is what I get when using FLEX with TOGA detent: https://youtu.be/Bcx1Wz4BEI0 Is this similar to what you guys see? Link to comment Share on other sites More sharing options...
CRJay 418 Posted December 2, 2021 Share Posted December 2, 2021 Yes, as you can see it overshoots the target thrust quite badly and then slowly rolls back to it. If you read the linked topic, issue is already confirmed. And to be clear, it does not work like that on the real plane. You might see it go maybe 0,5%N1 over the target, but not 5%. Link to comment Share on other sites More sharing options...
GEK_the_Reaper 233 Posted December 3, 2021 Share Posted December 3, 2021 @CRJay noted. I'm not sure if this is the same thing the OP @planevan describes. He states that the N1 constantly falls down to around 84% and settles there. My video actualy shows 2 things: 1) N1 overshoots the derated value (in this case 85,7%) by exactly 0,5 --> reaching max. 90,7 then slightly decreasing to the FLX value AND NOT GOING BELOW -and 2 (I saw this only now)- 2) just after TO (weight of wheels) you can see FLX changing to TO and the derated value of 85,7 increases to 87,4 --> is this correct (I'm not a RL Pilot) And again, I'm not sure this is the issue the OP describes... Link to comment Share on other sites More sharing options...
KuntaKinte 210 Posted December 3, 2021 Share Posted December 3, 2021 1 hour ago, GEK_the_Reaper said: 2) just after TO (weight of wheels) you can see FLX changing to TO and the derated value of 85,7 increases to 87,4 --> is this correct (I'm not a RL Pilot) This is not correct. FLX Thrust will remain active until FLX Temp is deleted or FLX Temp < OAT thrust levers are set to CLB or MAX Power WING and/or COWL A/I is ON Link to comment Share on other sites More sharing options...
CRJay 418 Posted December 3, 2021 Share Posted December 3, 2021 2 hours ago, GEK_the_Reaper said: @CRJay noted. I'm not sure if this is the same thing the OP @planevan describes. He states that the N1 constantly falls down to around 84% and settles there. My video actualy shows 2 things: 1) N1 overshoots the derated value (in this case 85,7%) by exactly 0,5 --> reaching max. 90,7 then slightly decreasing to the FLX value AND NOT GOING BELOW -and 2 (I saw this only now)- The 84% N1 value may simply be the max that TO/TO mode should give in the conditions at that time. And in your video it does not go 0,5 over, but 5. Which is quite significant and depending on conditions may be the difference between FLEX and normal TO thrust. The overall issue sounds the same to me, thrust rolling back during TO roll, something that should not happen. But no telling for sure unless a video is made. Link to comment Share on other sites More sharing options...
GEK_the_Reaper 233 Posted December 3, 2021 Share Posted December 3, 2021 @CRJay @KuntaKinte thank you for the information. I've entered these 2 issues on our issue tracking list (1 - overshooting N1, 2 - overwritten N1 after TO). I think these points are not that critical (no show stoppers) and have zero idea when they are gioing to be adressed. Link to comment Share on other sites More sharing options...
Karl-Tõnis Lepp 5 Posted December 8, 2021 Share Posted December 8, 2021 I have the same issue. I always use TOGA thrust for take-off because I do not have a reliable way of calculating FLEX. It spools up nice and then after hitting about 100kts or so will start to degrade. Next time I take off I will make a video. Definetly wasn't like this a few updates ago. Link to comment Share on other sites More sharing options...
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