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Old 07-20-2012, 12:29 AM
ACE-OF-ACES's Avatar
ACE-OF-ACES ACE-OF-ACES is offline
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Join Date: May 2010
Location: NM
Posts: 2,248
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My bad..

When checking for the tropopause, i.e.

Code:
if ( height < tropopause ) then
else
end
We have to adjust the whole T_std equation, not the the TLR!

Note I had this

Code:
if ( height < tropopause ) then
   TLR = 6.49(°C/1,000m) = 1.98(°C/1,000ft) = 3.56(°F)/1,000ft
else
   TLR = -56.5(°C) = 216.65(°K)
Which is wrong!

What we want to do is this

Code:
if ( height < tropopause ) then
   T_std = T_o - Alt_ind × TLR
else
   T_std = T_tropopause
Where
Code:
T_Topopause = -56.5(°C) = 216.65(°K)
__________________
Theres a reason for instrumenting a plane for test..
That being a pilots's 'perception' of what is going on can be very different from what is 'actually' going on.

Last edited by ACE-OF-ACES; 07-20-2012 at 12:45 AM.
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