On Fri, 2007-08-31 at 20:02 +0200, Timothy Moore wrote:
> Ron Jensen wrote:
> > On Fri, 2007-07-06 at 02:00 +0200, gh.robin wrote:
> >
> >> Thanks John,
> >>
> >> Yes the patch has vanished , probably in the vacuum space :)
> >>
> >> Because your patch is only a simple extension of the existing table it
> >> could
> >> be commit without any risk.
> >>
> >> Regards
> >
> > Hi,
> >
> > I freshened this patch to extend the altimeter from 62,000 ft to 100,000
> > ft. gh.robin and I have both reviewed it and recommend it be committed.
> >
> > Thanks,
> >
> > Ron
> >
>
> Committed; thanks
> Tim
Andy asked me to patch src/FDM/YASim/Atmosphere.cpp to match these
changes to src/Environment/environment.cxx.
The attached patch should do that... Could someone who flies YASIM
airplanes try this at high altitude (above 65K feet).
Thanks,
Ron
Index: src/FDM/YASim/Atmosphere.cpp
===================================================================
RCS file: /var/cvs/FlightGear-0.9/source/src/FDM/YASim/Atmosphere.cpp,v
retrieving revision 1.2
diff -u -r1.2 Atmosphere.cpp
--- src/FDM/YASim/Atmosphere.cpp 2 Mar 2003 01:43:39 -0000 1.2
+++ src/FDM/YASim/Atmosphere.cpp 1 Sep 2007 04:10:21 -0000
@@ -7,35 +7,50 @@
// McCormick lists 299.16/101325/1.22500, but those don't agree with
// R=287. I chose to correct the temperature to 288.20, since 79F is
// pretty hot for a "standard" atmosphere.
-// meters kelvin Pa kg/m^3
-float Atmosphere::data[][4] = {{ 0.0f, 288.20f, 101325.0f, 1.22500f },
- { 900.0f, 282.31f, 90971.0f, 1.12260f },
- { 1800.0f, 276.46f, 81494.0f, 1.02690f },
- { 2700.0f, 270.62f, 72835.0f, 0.93765f },
- { 3600.0f, 264.77f, 64939.0f, 0.85445f },
- { 4500.0f, 258.93f, 57752.0f, 0.77704f },
- { 5400.0f, 253.09f, 51226.0f, 0.70513f },
- { 6300.0f, 247.25f, 45311.0f, 0.63845f },
- { 7200.0f, 241.41f, 39963.0f, 0.57671f },
- { 8100.0f, 235.58f, 35140.0f, 0.51967f },
- { 9000.0f, 229.74f, 30800.0f, 0.46706f },
- { 9900.0f, 223.91f, 26906.0f, 0.41864f },
- { 10800.0f, 218.08f, 23422.0f, 0.37417f },
- { 11700.0f, 216.66f, 20335.0f, 0.32699f },
- { 12600.0f, 216.66f, 17654.0f, 0.28388f },
- { 13500.0f, 216.66f, 15327.0f, 0.24646f },
- { 14400.0f, 216.66f, 13308.0f, 0.21399f },
- { 15300.0f, 216.66f, 11555.0f, 0.18580f },
- { 16200.0f, 216.66f, 10033.0f, 0.16133f },
- { 17100.0f, 216.66f, 8712.0f, 0.14009f },
- { 18000.0f, 216.66f, 7565.0f, 0.12165f },
- { 18900.0f, 216.66f, 6570.0f, 0.10564f }};
+// Numbers above 19000 meters calculated from src/Environment/environment.cxx
+// meters kelvin Pa kg/m^3
+float Atmosphere::data[][4] = {{ -900.0f, 293.91f, 111679.0f, 1.32353f },
+ { 0.0f, 288.11f, 101325.0f, 1.22500f },
+ { 900.0f, 282.31f, 90971.0f, 1.12260f },
+ { 1800.0f, 276.46f, 81494.0f, 1.02690f },
+ { 2700.0f, 270.62f, 72835.0f, 0.93765f },
+ { 3600.0f, 264.77f, 64939.0f, 0.85445f },
+ { 4500.0f, 258.93f, 57752.0f, 0.77704f },
+ { 5400.0f, 253.09f, 51226.0f, 0.70513f },
+ { 6300.0f, 247.25f, 45311.0f, 0.63845f },
+ { 7200.0f, 241.41f, 39963.0f, 0.57671f },
+ { 8100.0f, 235.58f, 35140.0f, 0.51967f },
+ { 9000.0f, 229.74f, 30800.0f, 0.46706f },
+ { 9900.0f, 223.91f, 26906.0f, 0.41864f },
+ {10800.0f, 218.08f, 23422.0f, 0.37417f },
+ {11700.0f, 216.66f, 20335.0f, 0.32699f },
+ {12600.0f, 216.66f, 17654.0f, 0.28388f },
+ {13500.0f, 216.66f, 15327.0f, 0.24646f },
+ {14400.0f, 216.66f, 13308.0f, 0.21399f },
+ {15300.0f, 216.66f, 11555.0f, 0.18580f },
+ {16200.0f, 216.66f, 10033.0f, 0.16133f },
+ {17100.0f, 216.66f, 8712.0f, 0.14009f },
+ {18000.0f, 216.66f, 7565.0f, 0.12165f },
+ {18900.0f, 216.66f, 6570.0f, 0.10564f },
+ {19812.0f, 216.66f, 5644.0f, 0.09073f },
+ {20726.0f, 217.23f, 4884.0f, 0.07831f },
+ {21641.0f, 218.39f, 4235.0f, 0.06755f },
+ {22555.0f, 219.25f, 3668.0f, 0.05827f },
+ {23470.0f, 220.12f, 3182.0f, 0.05035f },
+ {24384.0f, 220.98f, 2766.0f, 0.04360f },
+ {25298.0f, 221.84f, 2401.0f, 0.03770f },
+ {26213.0f, 222.71f, 2087.0f, 0.03265f },
+ {27127.0f, 223.86f, 1814.0f, 0.02822f },
+ {28042.0f, 224.73f, 1581.0f, 0.02450f },
+ {28956.0f, 225.59f, 1368.0f, 0.02112f },
+ {29870.0f, 226.45f, 1196.0f, 0.01839f },
+ {30785.0f, 227.32f, 1044.0f, 0.01599f }};
// Universal gas constant for air, in SI units. P = R * rho * T.
// P in pascals (N/m^2), rho is kg/m^3, T in kelvin.
const float R = 287.1f;
-// Specific heat ratio for air, at "low" temperatures.
+// Specific heat ratio for air, at "low" temperatures.
const float GAMMA = 1.4f;
float Atmosphere::getStdTemperature(float alt)
-------------------------------------------------------------------------
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