QFE from height info from MP map

[Wayc00lio]

Hey all,

 

When planning missions on a MP map, I can hover over a location (river junction - or whatever) and get the coords and plan a flight plan that way. I can also get altitude info for a target (if visible) but how do I convert that height info into QFE for targeting?

 

Also, if the units are not visible and I cannot get height info for that target, how does one go about getting QFE data into the jet?

 

In SP - set up a flight plan on the map before T/O - in MP, this is not possible.

 

Will this not limit the available stores for a MP flight?

[david.lind]

https://forums.eagle.ru/showthread.php?t=181697

 

last youtube first post.

[Mange]

There is a good app called AutoDens for iPhone that you can use for that...

[Burnhard]

Hi!

I've made a google sheet from scratch for this :) check tab QFE and Cooridnates. Spent all winter vacation on it haha.

 

I can make it for external use, maybe. As of now this is a link to the sheet i personally use. It automatically does just about everything for you. Gets the altitude from google maps, calculate the qfe. All you need to provide is temp and qnh at sea level, + coordinates in DEC format (DD.MM,MM)

 

https://docs.google.com/a/tryggheimstrand.no/spreadsheets/d/1WU9NxfpYSeZSEnekXMaALiUsiuB6fzrcfD_-OMfmaBc/edit?usp=drivesdk

Edited April 13, 2017 by Burnhard

[AbortedMan]

Easy QFE calculator webpage. All you need is QNE from the kneeboard (available in all MP missions) and the altitude of the target from the F10 map.

 

https://jscalc.io/calc/NGuKq67hvnghk4rM#%7B%221%22:null,%222%22:null%7D

[Burnhard]

@abortedman You need temperature as well for it to be precise:)

Edited April 14, 2017 by Burnhard

[Burnhard]

If you want to do this on the fly these are my best tips. I use two quick and easy ways of doing this:

 

Method A (best suitable for mountains)

- Fly level with your targets

- Adjust the QFE knob so that the altimeter reads zero.

 

Method B (best suitable for plains)

- Fly over some place that is about the same altitude as your target location.

- Read the radar height in the HUD

- Adjust the QFE so that the Altimeter reads the same as your radar height

Edited April 15, 2017 by Burnhard

[doodenkoff]

In the absence of dynamic weather, can it be safely assumed that QFE between two different locations on the Caucasus map always differ by the same value, regardless of the weather set in the mission?

 

What I'm envisioning is that I can check the QFE difference between multiple points "A" and "B"--maybe between airfields, harbors, or other landmarks--in a single player environment, then when on a multiplayer server, I can use the QFE shown at the starting airfield to determine QFE at various places around the map.

 

So is it possible to determine the QFE for a distant location just by taking the currently indicated QFE and subtracting or adding some specific value? As long as I know how much the two places should differ?

[Ramsay]

Check out xxJohnxx's QFE video

 

 

Worked Example

Data

1 hPa = 9.3 m, QNH = 1012 hPa (at sea level), Target Altitude 1918 m (from F10 map)

 

Calculations

Differential Pressure = Target Altitude / Pressure Change = 1918 m /9.3 m/hPa = 206 hPa

Target QFE = QNH - Differential Pressure = 1012 -206 hPa = 806 hPa

Edited April 14, 2017 by Ramsay

[QuiGon]

In the absence of dynamic weather, can it be safely assumed that QFE between two different locations on the Caucasus map always differ by the same value, regardless of the weather set in the mission?

 

What I'm envisioning is that I can check the QFE difference between multiple points "A" and "B"--maybe between airfields, harbors, or other landmarks--in a single player environment, then when on a multiplayer server, I can use the QFE shown at the starting airfield to determine QFE at various places around the map.

 

So is it possible to determine the QFE for a distant location just by taking the currently indicated QFE and subtracting or adding some specific value? As long as I know how much the two places should differ?

 

 

 

That's exactly how I do it and as far as I can tell it works just fine with static weather. Dynamic weather is a different story though or it least it should be. Haven't tried with dynamic weather.

[Burnhard]

@Ramsay

This is only valid for standard conditions (If i remember correctly 29.92 inHg and 20deg C), and the offset (delta) of QFE of say 2000m altitude will vary with QNH and temperature.

It is not consistent.

Believe me I've tried excessively and compared calculations with the built in kneeboard QFE.

 

What I'm hoping for though is that we could have a single graph showing both QFE/QNH - temp at sea level (different lines in the graph) - and altitude.

Something similar but not excactly like this: http://docs.engineeringtoolbox.com/documents/309/water-density-temperature-pressure_2.png

------------------

DCS favorites: AJS 37 - A10C - SA342

member of TAWDCS.org

[CoBlue]

Easiest way is to check your altitude at starting airfield & target point on the map. Then subtract the value from your altimeter (if target is above).

ie. Your airfield alt. = 150m, Target alt. =250m, = 100m difference.

Set your altimeter to 0m (starting airfield) & subtract so it reads -100m.

[doodenkoff]

Easiest way is to check your altitude at starting airfield & target point on the map. Then subtract the value from your altimeter (if target is above).

ie. Your airfield alt. = 150m, Target alt. =250m, = 100m difference.

Set your altimeter to 0m (starting airfield) & subtract so it reads -100m.

 

It isn't very accurate. For example, my starting point was at 30m, the target was at 85m. I set the altimeter to read -55m and could not get a weapon release. The solution never thought I was at the correct altitude.

[Deezle]

Easy QFE calculator webpage. All you need is QNE from the kneeboard (available in all MP missions) and the altitude of the target from the F10 map.

 

https://jscalc.io/calc/NGuKq67hvnghk4rM#%7B%221%22:null,%222%22:null%7D

This seems to be reasonably accurate.

[mafuasu]

Works fine. Also the app for iPhone.

QNH from the kneeboard and height from the F10 map and then bombs away ;)

[Wizard1393]

Dunno if anyone thought of it, but the absolutely best thing imho would be if you could somehow through the ground crew menu options empty the current flight plan, create a new flightplan with wpts and targets in the computer manually and perform a kneeboard rebuild.

 

This would make the Viggen much more flexible in terms of flying the dynamic mp/sp missions we see alot these days.

 

This is really mainly "gameplay" enhancing, as it off course is much easier and more true to IRL to plan a mission in the ME/Mission Planner

[Tj1376]

Dunno if anyone thought of it, but the absolutely best thing imho would be if you could somehow through the ground crew menu options empty the current flight plan, create a new flightplan with wpts and targets in the computer manually and perform a kneeboard rebuild.

 

This would make the Viggen much more flexible in terms of flying the dynamic mp/sp missions we see alot these days.

 

This is really mainly "gameplay" enhancing, as it off course is much easier and more true to IRL to plan a mission in the ME/Mission Planner

 

 

 

Times two. Would love if inputting waypoints would update the kneeboard! Great idea!

 

TJ

 

 

Sent from my iPhone using Tapatalk

[Wizard1393]

Yeah it's not even "really" necessary to be able to "zero" the flight plan. You can always alter waypoints as you wish, but being able to "rebuild" the kneeboard pages with the currently entered flight plan data while on the ground with ground crew access would help tremendously.

 

Any devs wanna comment on this suggestion?

[Wizard1393]

Bumpitybump :)