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flybywiresim
Takeoff calculations on EFB.
Is your feature request related to a problem? Please describe.
Hi, it would be great to have a take off performance calculator with flex to temp calculation too and v speeds. Describe the feature you'd like to see implemented
References
Additional context
Discord username (if different from GitHub):
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You can remove the landing part (separate issue, and already underway in https://github.com/flybywiresim/a32nx/pull/3581).
You can remove the landing part (separate issue, and already underway in #3581).
cool.
Great Idea. As a reference maybe you can use http://www.wabpro.cz/A320
I always use it for the Flex and STAB TRIM (put the actual MAC-"Center of Gravity" and the TOW in the fields) calculation.
Great Idea. As a reference maybe you can use http://www.wabpro.cz/A320
I always use it for the Flex and STAB TRIM (put the actual MAC-"Center of Gravity" and the TOW in the fields) calculation.
Oh yes, i use that. Anyway i make some YouTube videos and get like 5 view per vid :DDD and when i record i forget to go to that website and i then have to cut a lot of footage because of wait time while i do the calculations on it... It would just be easier to do it on the EFB as many other EFB's for X plain 12 have. And like i opened another enhancement about the checklist on the EFB, it would just be way too helpful. I remember all the checklists but i haven't flown in 2 weeks and when i got back I forgot to do my CG but remembered every small thing :DD
I total agree with you, it would be really a nice and meaningful enhancement. Maybe one of the developers of the EFB will find a way to implement the calculations in EFB! BTW: Million thanks to ALL of you in the FBW Team. Without your work, the MSFS is only half the fun!
I total agree with you, it would be really a nice and meaningful enhancement. Maybe one of the developers of the EFB will find a way to implement the calculations in EFB! BTW: Million thanks to ALL of you in the FBW Team. Without your work, the MSFS is only half the fun!
what you mean, half the fun, it would be less than a quarter. I try to fly the default 320 and its soo empty.
For the "other half" of fun I use the Aerosoft CRJ ;-)
that explains it :D. I cant afford that since I only have problems, starting with my professional Logitech headset breaking into pieces, my glass sidepanel smashing...
I would love to take this and make this but I would need to learn all the calculations and stuff. and some help on getting the efb to work in browser window. I will do this after the merge of the landing calculator so i don't have to do double work.
I would love to take this and make this but I would need to learn all the calculations and stuff. and some help on getting the efb to work in browser window. I will do this after the merge of the landing calculator so i don't have to do double work.
Maybe i will dig and find calculations and maybe help you.
Maybe i will dig and find calculations and maybe help you.
That would help indeed, I'm not a pilot and don'y know how i would get to those calculations.
Maybe i will dig and find calculations and maybe help you.
That would help indeed, I'm not a pilot and don'y know how i would get to those calculations.
I want to be future pilot, Anyway, add me on steam so we can keep in touch?
The following sources all refer to A320. Information about the Neo could not be found by me
Why there is (probably) no formula available As far as I've researched former Flex Temp calculation was done by RTOW charts which are mostly not publicly availabe. Nowerdays the calculation is done by the EFBs (e.g. Flysmart+ by NavBlue). NavBlue TO calculation example: https://www.navblue.aero/wp-content/uploads/2017/08/pdt4-6.jpg
Flex Temp corrections Flex temps would propably only be an estimated value but never a 100% realistic value like in real aviation. I found an older document explaining the corrections of Flex Temp in various conditions, although they also refer to RTOW charts (which are not included in the examples). In the document you can check pages 87 (printed page nr. 81) to 95 (printed page nr. 89).
- QNH Delta as -10 hPA (result is always -2° C)
- RWY condition (wet is -1° C)
- Anti-Ice (+ 2° C)
It is furthermore noticed that the following conditions have to be met to have a valid flex temp
- Corrected Temperature (CT) <= TFlex Max (a value which would be extracted from the RTOW chart, so probably not available)
- CT > OAT
- CT > TRef (flat rated thrust)
- Thrust reduction must not exceed 25% of flat rated thrust
Source: https://www.cockpitseeker.com/wp-content/uploads/goodies/ac/a320/pdf/Print_Only/PTM%20with%20airbus%20doc/pdf/U0S2SP0-L.pdf Source 2 (Flex Takeoff definition and explanatory graphic): https://www.skybrary.aero/bookshelf/books/2263.pdf Page 91 (printed 87) to 93 (printed 89)
Examples of online takeoff calculators Source 1: https://www.theairlinepilots.com/forumarchive/a320/a320-flex-calculation.xlsx - This excel file can be unlocked for editing without a password and thus research the used formulas
Source 2: https://flightsim.to/file/11740/takeoff-landing-performance-calculator-a320 - This excel file cannot be unlocked without a password and thus the formula is not visible, but might be a reference
Source 3: https://www.fstools.tech/ - Online only as a website
Data source for runways Navigraph might be able to allow the use of their data like they've done for several other addon developers (I don't know the exact requirements): https://navigraph.com/community/developer-directory.
I am still checking for a valid source for all the data needed for a correct calculation, but they mostly would be:
- Runway elevation
- Runway slope (increasing or decreasing the actual runway length)
- Runway length
- Wind component (head / tailwind)
At least the runway elevation, length, and wind component are available within the sim navdata already. Not sure about slope.
I found a scientific work with some interesting functions in the appendix and explanations in the work itself:
https://documents.pub/document/joao-lemos-viana-takeoff-and-landing-performance-optimization.html
Hey! So its been a while. Does anyone know when this is implemented? Its a must have, a lot of companies have this on their ipads.
We don't give dates, and there are many things considered "must have" that we are working on. When we have time and necessary data we will do this, but until then patience is necessary.
however whats the status of this?
Unless someone has worked on it....it's not there
however whats the status of this?
Unless someone has worked on it....it's not there
i dont care about the dates, but like is anyone working on it? Or is it just sitting there? I mean its a must have since you already got landing page, why not add this and my other open one with the checklist and finish a whole section? It would be a very ease of use!
Nope, it's an open source project. Unless there is a PR open for it, we consider no one is working on it
why not add this
Because you see if we could just "add this" we'd have finished the whole aircraft and made the most realistic A320 of all time.
Unfortunately it is much more complicated than that, and while we are looking to get NEO takeoff perf data, it is simply not given in table form to pilots anymore.
ause you see if we could just "add this" we'd have finished the whole aircraft and made the most realistic A320 of
wheres that comment?
Yeah i understand what you are saying about data shortages.
I dont understand tho is if anyone is working on it currently, where do i see that?
You can't see that, because anyone could be working on it right now and we might not know. Someone can work on it without telling us. But it is unlikely that is the case.
Generally, someone working on it with minimally working code would open up a draft PR.
You can't see that, because anyone could be working on it right now and we might not know. Someone can work on it without telling us. But it is unlikely that is the case.
Generally, someone working on it with minimally working code would open up a draft PR.
Dont they label it?
In theory they should, but someone might be working on something locally and have not told anyone yet.
In theory they should, but someone might be working on something locally and have not told anyone yet.
How do i join the team to make it myself?
In theory they should, but someone might be working on something locally and have not told anyone yet.
How do i join the team to make it myself?
You don't have to be on the team to contribute. All you need to do is refer to the Contributing section. https://docs.flybywiresim.com/dev-corner/development-guide/
Quite trivial implementation of TRIM calculation, I will add some functionality to left-hand card as there is no(?) easy way to find planned gross weight CG during preflight phase except to wait for fully loaded aircraft and look at MCDU.
Quite trivial implementation of TRIM calculation, I will add some functionality to left-hand card as there is no(?) easy way to find planned gross weight CG during preflight phase except to wait for fully loaded aircraft and look at MCDU.
Trim isn't really calculated, airbus SOP is to use the trim wheel to set the CG.
The Gross CG can be found clicking this in the flypad on ground page for reference which IIRC is also set as L:A32NX_AIRFRAME_GW_CG_PERCENT_MAC_DESIRED once payload is loaded
