Feature #26071

Should be able to calibrate altimeter (ASL/ATL)

Added by themaster over 3 years ago. Updated about 2 years ago.

Status:In progress Start date:11/01/2011
Priority:Normal Due date:
Assignee:rocko % Done:

0%

Category:Complex
Target version:TBD
Component: Affected Version:
Close Reason:

Description

see the video:
at end there are on ground still around 300m.

<iframe width="425" height="349" src="http://www.youtube.com/embed/AwGOfMQbEnQ?hl=de&fs=1" frameborder="0" allowfullscreen></iframe>

if i open the para like before at 300-400m i am already on the ground.

hurts a little , while opening the chute ;)

History

Updated by Sickboy over 3 years ago

  • Status changed from New to Feedback
  • Assignee set to themaster

IIRC Altimeters show hight above sea level, not above ground :O

Updated by themaster over 3 years ago

the problem is , while jumping you dont know the hight of the map. i know i can read teh maphigh, but
than calculating high of map, diffrence and opening para hight. that takes to long in realtime ;)

but its ok, i have to do that calculating before jump-not when jumping ;) , didnt know its sealevel.
momo

Updated by rocko over 3 years ago

That is how a barometric altimeter works, themaster. It measures the pressure of the air in a certain height. Though one can probably assume that you calibrate your altimeter to the local airpressure on ground, so you have a reference once in the air and measuring the correct height above ground. Currently you are to assume the altimeter is set to QNH not QFE (or more correct QNE). In this case getPosATL would make more sense here, if we assume the user does calibrate his altimeter before entering the airplane. However, this is a solution that's a bit arcadish.

Updated by Sickboy over 3 years ago

Allow the user to calibrate it at the ground? Dunno if it's possible/useful to calibrate while in the airplane :D

Updated by Huggy over 3 years ago

themaster wrote:

the problem is , while jumping you dont know the hight of the map. i know i can read teh maphigh, but
than calculating high of map, diffrence and opening para hight. that takes to long in realtime ;)

That is something you are doing BEFORE the jump not while you are already in the air.
Preparation is everything if you wanna jump out of intact airplanes.

Updated by rocko over 3 years ago

themaster, pls come online IMMEDIATELY so I can beat errr teach some math basics into you.

Updated by Sickboy over 3 years ago

  • Tracker changed from Bug to Feature
  • Assignee deleted (themaster)
  • Target version set to 395

Updated by Sickboy over 3 years ago

  • Subject changed from para altimeter wrong hight to Should be able to calibrate altimeter (ASL/ATL)

Updated by rocko over 3 years ago

  • Target version changed from 395 to Planned (Needs Contributors)

Updated by rocko about 2 years ago

  • Status changed from Feedback to In progress
  • Assignee set to rocko
  • Target version changed from Planned (Needs Contributors) to 1.14

Updated by ScarecrowisNOTamused. about 2 years ago

rocko wrote:

That is how a barometric altimeter works, themaster. It measures the pressure of the air in a certain height. Though one can probably assume that you calibrate your altimeter to the local airpressure on ground, so you have a reference once in the air and measuring the correct height above ground. Currently you are to assume the altimeter is set to QNH not QFE (or more correct QNE). In this case getPosATL would make more sense here, if we assume the user does calibrate his altimeter before entering the airplane. However, this is a solution that's a bit arcadish.

Not really relevant anymore but from memory aviation maps have the average air pressure (in addition to spot heights obviously) at ground level printed on them so that altimeters can be adjusted for different terrains while in flight.
So i assume the jumpmaster could just ask for the above info from the aircrew to adjust the jumpers altimeters.

Updated by rocko about 2 years ago

  • Target version changed from 1.14 to TBD

Updated by rocko about 2 years ago

  • Category set to Complex

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