87 lines
3.3 KiB
XML
87 lines
3.3 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright (c) 2016 HHS81 and dany93
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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-->
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<system name="indicated-airspeed">
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<!--
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(dany93) Largely inspired from c182, thanks HHS81.
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-->
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<!--
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IAS Indicated airspeed (IAS) is the airspeed indicator reading(ASIR)
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uncorrected for instrument, position, and other errors.
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From current EASA definitions: Indicated airspeed means the speed of
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an aircraft as shown on its pitot static airspeed indicator
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calibrated to reflect standard atmosphere adiabatic compressible
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flow at sea level uncorrected for airspeed system errors.
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Calibrated airspeed (CAS) is indicated airspeed corrected for
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instrument errors, position error (due to incorrect pressure at the
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static port) and installation errors.
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According the POH Skyhawk C172P-1982 on Page 5-9 airspeed
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calibration shows a large difference between KIAS and KCAS at lower
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speeds than 90 and above.
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It seems this is not reflected by JSBSim or FlightGear in a
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realistic way.
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So use this numbers and create a table which corrects the
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output shown on the ASI.
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-->
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<channel name="indicated airspeed">
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<fcs_function name="systems/asi/indicated-airspeed">
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<function>
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<table>
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<independentVar lookup="row">velocities/vc-kts</independentVar>
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<independentVar lookup="column">fcs/flap-pos-deg</independentVar>
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<tableData>
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0 10 30
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0 0 0 0
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47 38 38 40
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49 40 40 42
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53 45 47 50
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55 49 50 52
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56 50 51 54
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62 60 60 61
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70 70 70 70
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80 81 81 80
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89 90 90 90
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98 100 100 100
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107 110 109 109
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117 120 120 120
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126 130 130 130
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135 140 140 140
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145 150 150 150
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154 160 160 160
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</tableData>
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</table>
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</function>
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</fcs_function>
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<switch name="systems/asi/indicated-airspeed-serviceable">
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<output>velocities/vias-kts</output>
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<default value="systems/asi/indicated-airspeed"/>
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<test logic="AND" value="0.0">
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/sim/model/c172p/securing/pitot-cover-visible EQ 1
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</test>
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</switch>
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</channel>
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</system>
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