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News: Precision Simulator update 10.85 (23 July 2019) is now available

Author Topic: Engine Out Cruise and Step Climbs  (Read 328 times)

Mariano

  • Join date: May 2009
  • Posts: 592
Engine Out Cruise and Step Climbs
« on: Sat, 29 Jun 2019 15:10 »
Hardy,

I have attached a .situ link below.

https://www.dropbox.com/s/xh5kdwe5kz8ajap/00%20-%20EO%20CRZ.situ?dl=0

Basically, I was cursing normally, shut down an engine, and drifted down to FL290 (optimum is FL291). On the way down, I deleted all pilot-entered step climbs and set the step climb value to ‘2000’.

If you open the .situ and play with the step climb field, take a look at the value in 1R. For instance, if I enter ‘2000’, 1R shows ‘FL340’, if I enter ‘1000’, 1R shows ‘FL310’ (I was expecting 1R to show ‘FL310’ after entering ‘2000’).

I must be overlooking something.

Thanks and best regards,

Mariano
« Last edit: Sat, 29 Jun 2019 15:30 by Mariano »

Hardy Heinlin

  • Moderator
  • Join date: May 2009
  • Posts: 10668
    • Aerowinx
Re: Engine Out Cruise and Step Climbs
« Reply #1 on: Sat, 29 Jun 2019 15:42 »
Thanks for the situ file.

I can reproduce this error in PSX 10.0.4 up to version 10.81.

It seems to occur in E/O CRZ when a speed mode other than E/O SPD is selected (SEL SPD or LRC).

I'll try to isolate it ...


Cheers,

|-|ardy

Mariano

  • Join date: May 2009
  • Posts: 592
Re: Engine Out Cruise and Step Climbs
« Reply #2 on: Sat, 29 Jun 2019 15:55 »
Ah, excellent, thank you.

Best regards,

Mariano

Hardy Heinlin

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  • Join date: May 2009
  • Posts: 10668
    • Aerowinx
Re: Engine Out Cruise and Step Climbs
« Reply #3 on: Sat, 29 Jun 2019 16:52 »
OK, fixed ... and will be available in PSX 10.82.

The step climb profile on the LEGS was correct, but the selection logic of the first S/C for the next S/C ETA/fuel/distance display on the CRZ page contained the risk of a rounding error. That's why this error was hard to discover in the past years. Congrats, Mariano :-)

The whole enroute track is split in small segments for calculations of the fuel consumption, speeds etc. pp. For the above S/C index selection logic there was a superfluous MAX ALT check, and if this was exceeded (could've been just 1 foot), the index picker took the last S/C of the route. So what you got was a correct profile, but the data on the CRZ page referred to the very last S/C in the route instead of the first S/C.


|-|ardy

Mariano

  • Join date: May 2009
  • Posts: 592
Re: Engine Out Cruise and Step Climbs
« Reply #4 on: Sat, 29 Jun 2019 17:46 »
Hardy,

That’s was as quick a fix of a very complex software piece as I have ever seen.

Thanks!

Best regards,

Mariano

RRVyper

  • Join date: Sep 2018
  • Posts: 53
Re: Engine Out Cruise and Step Climbs
« Reply #5 on: Sun, 30 Jun 2019 19:16 »
Basically, I was cursing normally, ...
I wonder what would have happened if your were cursing abnormally!?

Sorry, couldn't resist. 😂

Randy

Hardy Heinlin

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  • Join date: May 2009
  • Posts: 10668
    • Aerowinx
Re: Engine Out Cruise and Step Climbs
« Reply #6 on: Sun, 14 Jul 2019 14:39 »
Bugfix is now available in PSX 10.82:

http://aerowinx.com/board/index.php?topic=4191.0


Regards,

|-|ardy