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Performance Calculations (Takeoff, Landing) in SD


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thomas.fischer2018
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I know it's been discussed before, but I still don't understand why this feature is not implemented yet.

The manual calculation of the takeoff and landing distance is relatively timeconsuming, annoying, and it can be 95% automated as shown by other apps or competition software like Flight Planner. In Germany it is mandatory to do this and document it (at least for insurance reasons it's advisable).

Calculation of the takeoff and landing distance (and perhaps climb performance) depending on 
- airport elevation
- temperature 
- pressure 
(or the density altitude)
- wind direction & speed at the time of departure or arrival
- weight (from weight & balance calculations) at the time of departure or arrival
- runway condition (inclination, grass, and user answered parameters like wet or not, active runway selection)
- aircraft profile 
- user specific safety margin
would be a great feature, both for planning in advance as well as during in-flight.

Aircraft performance profiles could be edited and shared by users for the most common aircrafts like Cessna 172 etc.
The map could be filtered for airports that have long enough runways, also in case of an emergency to find a field nearby. Or it could show on the warnings tab if the the calculated length is shorter than the landing distance available.

I love SkyDemon, but i would like to get rid of these other apps that i need to calculate those distances for me....

Edited 11/9/2018 3:07:08 PM by thomas.fischer2018
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moefly
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Tim Dawson - 6/17/2021 9:39:34 AM
I suspect the way other apps do it is by roughly digitising the graphs from POH books, which are compiled in the manner pilot-byom states. It's unclear where liabilities fall if anyone depends on this digital data.

At present incorporating and maintaining this data is not part of the plans for SkyDemon.


As I just stumbled over this thread:
I personally find Take Off Distance the most crucial one. The german aviation agency (LBA - Luftfahrtbundesamt) published a guideline (as part of fsm 3/75) that I (and many other pilots I know in GA in Germany) use for that purpose on shorter airfields. The only plane specific parameters it takes is the Take off distance over 15m that you'll usually find in POH. From there it just adds surpluses (which are definitely on the conservative aka safe side) based on density altitude, temperature and runway conditions.
To make calcs easier and quicker for me I created an excel sheet where I just put in the base numbers and select the conditions.

Maybe that LBA approach would be a simple (as in only requiring one simple airplane specific datapoint - TOD over 15m), yet good solution that could be implemented in Skydemon?
Yes, it won't be accurate to the meter, but that's not the intend either. LBA intended it to give a minimum length that it safe to take off based on the conditions.

Source:
AOPA Germany (I found it to be the most nicely formated one, still based on the LBA fsm 3/75 recommendations), Page 2:
https://aopa.de/wp-content/uploads/49_Berechnungen_und_Formeln_fuer_Piloten.pdf

Unfortunately I could only find this in German but would be more than happy to translate if copy&pasting from the pdf doesn't work well. And ofc I'm also happy to share my Excel calculation sheet if it's helpful.
Edited 9/12/2024 10:49:15 AM by moefly
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thomas.fischer2018 - 11/9/2018 2:18:33 PM
Mastering Aviation - 2/22/2021 3:46:31 PM
C401 - 2/24/2021 12:50:17 AM
     Seconded!
jaimebeneyto - 3/1/2021 2:21:42 PM
jbmoens - 3/7/2021 5:47:20 PM
grahamb - 3/7/2021 6:25:36 PM
PaulSS - 3/8/2021 8:57:07 AM
pilot-byom - 3/8/2021 9:15:58 AM
erchegyia - 6/16/2021 12:37:11 PM
Tim Dawson - 6/16/2021 1:31:16 PM
erchegyia - 6/16/2021 6:01:58 PM
Martin Bech - 6/16/2021 6:53:18 PM
pilot-byom - 6/17/2021 6:40:11 AM
Tim Dawson - 6/17/2021 9:39:34 AM
moefly - 9/12/2024 6:55:16 AM
Cheeseman1112 - 10/6/2021 7:20:58 AM
BJS - 10/8/2021 6:51:16 AM
Tim Dawson - 9/12/2024 9:56:34 AM
moefly - 9/12/2024 11:09:19 AM
Tim Dawson - 9/13/2024 9:16:31 AM
             +1
Sky Painter - 9/13/2024 10:36:19 AM
fabria - 9/13/2024 11:59:33 AM

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