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 25 Version .99 Thrust (Read 3132 times)
N90831
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Version .99 Thrust
Jul 10th, 2020 at 3:14am
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Downloaded the new version. Installed. Planned flight as usual.
Flight was from MMMX to SKBO.
I know there are issues in normal operations as to altitude and density altitude.
I loaded the aircraft and at the stand (gate) I was 1% over.  With burnoff from idle at the stand and taxi to rwy 23L at time of take off I was @99% of Gross of Takeoff weight.
Clearance for take off received and the problem was evident immediately.
It took half the runway to obtain 80Kts.  It took 11, 400 ft to obtain 145 kts.  V1 was suppose to be 165.  Aircraft did reach transitional lift .  At 2500 ft AGL the aircraft lost all lift and made a dive to the ground at which time a crash incurred.

My point?   What ever changes took place in version .99  its not good for thrust.  Aircraft was de-rated tremendously.

anyone else?
  

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CaptBel4
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v0.99 - Additional Concerns
Reply #1 - Jul 10th, 2020 at 3:29am
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Team CaptainSim,

You guys are doing great work! I have noticed that it appears as if the following items have since come up in v0.99

Has anyone noticed VNAV speed management appears to be worse than 0.98 and the spoilers continue to cause excess thrust adjustments and chasing. Reverse thrust also appears to be weaker... I use to get 65% N1 now only 47% max.

Any suggestions?

  
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CaptBel4
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Re: v0.99 - Additional Concerns
Reply #2 - Jul 10th, 2020 at 4:01am
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There is 100% a thrust problem. I just encountered a CFIT into CYVR. VNAV is also sending bad numbers to FMC....
  
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Captain Sim
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Re: Version .99 Thrust problem
Reply #3 - Jul 10th, 2020 at 6:29am
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N90831 wrote on Jul 10th, 2020 at 3:14am:
What ever changes took place in version .99  its not good for thrust.

AIIR#6 https://www.captainsim.org/forum/csf.pl?num=1588001095
  
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Captain Sim
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Re: Version .99 Thrust problem
Reply #4 - Jul 10th, 2020 at 6:30am
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CaptBel4 wrote on Jul 10th, 2020 at 4:01am:
There is 100% a thrust problem.

AIIR#6 https://www.captainsim.org/forum/csf.pl?num=1588001095
  
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nicolas boileau
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Re: Version .99 Thrust problem
Reply #5 - Jul 10th, 2020 at 10:42am
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now on v0.99 thanks Captain Sim for a 767 for p3dv 4 and 5 ! before you start you sim dont forget to calibrate the joysticke and moduels aka Goflight.... fsuipc or direct form p3d or ... ETC bit the rest is fine ! afpha yoke works fine !

continue de work she not done !
  
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N90831
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Re: Version .99 Thrust problem
Reply #6 - Jul 10th, 2020 at 2:21pm
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Captain Sim......

This was not a crash to desktop.  I was speaking crash as in the aircraft crashed because of lack of thrust.

This was not a problem in previous versions.

Your link is for bug problems are for CTD?  This didn't happen.
  

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Captain Sim
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Re: Version .99 Thrust problem
Reply #7 - Jul 10th, 2020 at 2:37pm
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N90831 wrote on Jul 10th, 2020 at 2:21pm:
Your link is for bug problems are for CTD?

Nope.
We need #6 which is:
6. For all flight related floating issues (FMC, MCP, VNAL/LNAV etc):
- SAVE the scenario right on or before the issue - press ;
- ZIP all 3 files of the saved scenario:
xxxxx.fxml
xxxxx.cs.config
xxxxx.wx
(located in %USERPROFILE%\Documents\Prepar3D v4 Files\  folder)
- Attach the ZIP archive to your post.
  
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N90831
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Re: Version .99 Thrust problem
Reply #8 - Jul 10th, 2020 at 5:17pm
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REF PROBLEM:  per my post on this issue.

Page Number from Manual:  Part II, page 111.

I tried to recreate the flight from last evening. So the original data is gone.  But the data provided is very close although I maintained NON-FMC control once FMC could not calculate the thrust needed.

Attached is files per Bug Tracking post:



  

Previous_Flight.zip ( 30 KB | 62 Downloads )

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400kts
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Re: Version .99 Thrust problem
Reply #9 - Jul 22nd, 2020 at 9:22pm
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Same problem here,

it takes half of the runway just to reach 80 kts and VR is reached almost over the opposite threshold, you can clearly see that once you press THR the aircraft is not accelerating as it should, no difference if is a rated or de-rated takeoff, I have created a scenario and saved it just for the due analysis, if is not a fault of mine I hope this might help to solve the issue asap as is definitely unrealistic to fly the airplane like this.

Thanks in advance for the help
  

takeoff_767_lipq_cs.zip ( 30 KB | 55 Downloads )
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Captain Sim
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Re: Version .99 Thrust problem
Reply #10 - Jul 23rd, 2020 at 11:38am
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N90831 wrote on Jul 10th, 2020 at 3:14am:
anyone else?

Good call.
Just 2 complains make us feel there's smth wrong at your end.
We need at least a few more reports.
And pls make sure you are on 0.991
  
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400kts
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Re: Version .99 Thrust problem
Reply #11 - Jul 23rd, 2020 at 4:32pm
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Confirm, I am on 0.991, I have also tried to install and uninstall it but the problem remain, tried also to remove yoke and throttle but no changes too, all the rest seems to works properly, the thrust at takeoff not...
  
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Alex T
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Re: Version .99 Thrust problem
Reply #12 - Jul 23rd, 2020 at 5:29pm
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I tested thrust last night and had zero problems accelerating. I used an assumed temp of 49* and it was a hot day and I had no problems. My load was a realistic 30/202 with cargo being 9k and 13k lb. I'll upload a video soon.
  
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Alex T
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Re: Version .99 Thrust problem
Reply #13 - Jul 23rd, 2020 at 7:08pm
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Used a bit less runway than the takeoff perfomance calculator suggested. But for it being 30*C and humid, it climbed pretty well at 360.000lb https://youtu.be/wmxRlA8E7XY
  
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400kts
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Re: Version .99 Thrust problem
Reply #14 - Jul 23rd, 2020 at 9:37pm
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So, I know is not that scientific but I tried to replicate what you shown in the video and the only way to get similar performances is to set D-TO with a max temp of 28° C, higher assumed temp lead to what I described above, no way at all to perform a D-TO 1 or D-TO2, I reach the other runway threshold to get to the VR.
With a D-TO and a 28° C assumed temp it requested almost 10.000 ft to get to the VR, I don't remember the grossweight, roughly I had 60% of payload and 80% of fuel just to give few numbers.

Could you try to do the same with a D-TO1 or 2 and 40-45 ° C assumed temp? Just to see if it takes long to reach 80 kts.
Anyway I don't have the same performances you had with a 35° C assumed temp you used in the video so there's definitely something wrong here, I wonder what...
  
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