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<title>Flight computer</title>
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</style><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="Flight_management_system" title="Flight management system">Flight management system</a>.</div>
<p>A <b>flight computer</b> is a form of <a href="Slide_rule" title="Slide rule">slide rule</a> used in <a href="Aviation" title="Aviation">aviation</a> and one of a very few <a href="Analog_computer" title="Analog computer">analog computers</a> in widespread use in the 21st century. Sometimes it is called by the make or model name like <a href="E6B" title="E6B">E6B</a>, CR, CRP-5, <i>Whizz wheel</i> or in German, as the <i>Dreieckrechner</i>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p><p>They are mostly used in <a href="Flight_training" title="Flight training">flight training</a>, but many professional pilots still carry and use flight computers. They are used during flight planning (on the ground before takeoff) to aid in calculating fuel burn, wind correction, time en route, and other items. In the air, the flight computer can be used to calculate ground speed, estimated fuel burn and updated estimated time of arrival. The back is designed for wind correction calculations, i.e., determining how much the wind is affecting one's speed and course.
</p><p>One of the most useful parts of the E6B, is the technique of finding distance over time. Take the number 60 on the inner circle which usually has an arrow, and sometimes says rate on it. 60 is used in reference to the number of minutes in an hour, by placing the 60 on the airspeed in knots, on the outer ring the pilot can find how far the aircraft will travel in any given number of minutes. Looking at the inner ring for minutes traveled and the distance traveled will be above it on the outer ring. This can also be done backwards to find the amount of time the aircraft will take to travel a given number of nautical miles. On the main body of the flight computer it will find the wind component grid, which it will use to find how much crosswind the aircraft will actually have to correct for.
</p><p>The crosswind component is the amount of crosswind in knots that is being applied to the airframe and can be less than the actual speed of the wind because of the angle. Below that the pilot will find a grid called crosswind correction, this grid shows the difference the pilot needs to correct for because of wind. On either side of the front it will have rulers, one for statute miles and one for nautical miles on their sectional map.
</p><p>Another very useful part is the conversion scale on the front outer circle, which helps convert between Fahrenheit and Celsius. The back of the E6B is used to find ground speed and determine how much wind correction it needs.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="Gallery">Gallery</h2></div>
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<div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"></span></div>
<div class="gallerytext">CAS-TAS conversion</div>
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<div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"></span></div>
<div class="gallerytext">An E6B flight computer commonly used by student pilots.</div>
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<div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"></span></div>
<div class="gallerytext">nm-km conversion on a CRP-5 flight computer</div>
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<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Index_of_aviation_articles" title="Index of aviation articles">Index of aviation articles</a></li>
<li><a href="Wind_triangle" title="Wind triangle">Wind triangle</a></li>
<li><a href="Dead_reckoning" title="Dead reckoning">Dead reckoning</a></li>
<li><a href="Flight_management_system" title="Flight management system">Flight Management Computer</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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</style><cite id="CITEREFvan_Riet2009" class="citation web cs1">van Riet, Ronald (2009). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20191002225032/http://www.wiki.luftwaffedata.co.uk/wiki/images/Dreieckrechner_2009.pdf">"Knemeyer Dreieckrechner"</a> <span class="cs1-format">(PDF)</span>. <i>wiki.luftwaffedata.co.uk</i>. Archived from <a rel="nofollow" class="external text" href="http://www.wiki.luftwaffedata.co.uk/wiki/images/Dreieckrechner_2009.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2019-10-02<span class="reference-accessdate">. Retrieved <span class="nowrap">April 13,</span> 2017</span>.</cite></span>
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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite id="CITEREFAviation_Supplies_&amp;_Academics1992" class="citation book cs1">Aviation Supplies &amp; Academics (1992). <i>E6-B Flight Computer Instructions</i>. ASA. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a>&nbsp;<bdi>1-56027-421-2</bdi>.</cite></span>
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<div class="side-box-text plainlist">Wikimedia Commons has media related to <span style="font-weight: bold; font-style: italic;"><a href="https://commons.wikimedia.org/wiki/Category:Flight_computer" class="extiw external" title="commons:Category:Flight computer">Flight computer</a></span>.</div></div>
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<ul><li><a rel="nofollow" class="external text" href="https://patents.google.com/patent/US2097116A/en?oq=US2097116">US2097116A – Plotting and computing device</a></li>
<li><a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=zPUKCzg8bdU&amp;pp=0gcJCdgAo7VqN5tD">Aero Products APR E6-B2 Flight Computer Airlearn System</a></li>
<li><a rel="nofollow" class="external autonumber" href="https://www.youtube.com/watch?v=L8ORGN6zZog">[1]</a></li></ul>
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<ul><li><a href="E6B" title="E6B">E6B</a></li></ul></li>
<li><a href="Breitling_Navitimer" title="Breitling Navitimer">Breitling Navitimer</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Cylindrical, helical scales</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Bygrave_slide_rule" title="Bygrave slide rule">Bygrave slide rule</a></li>
<li><a href="Fuller_calculator" title="Fuller calculator">Fuller calculator</a></li>
<li><a href="Otis_King" title="Otis King">Otis King's Patent Calculator</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Cylindrical, bars</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Thacher_cylindrical_slide_rule" class="mw-redirect" title="Thacher cylindrical slide rule">Thacher cylindrical slide rule</a></li>
<li><a href="Loga_cylindrical_slide_rule" class="mw-redirect" title="Loga cylindrical slide rule">Loga cylindrical slide rule</a></li></ul>
</div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Mechanical_Calculator" class="mw-redirect" title="Mechanical Calculator">Mechanical</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Pascaline" title="Pascaline">Pascaline</a> (1642)</li>
<li><a href="Difference_engine" title="Difference engine">Difference engine</a> (1820)</li>
<li><a href="Comptometer" title="Comptometer">Comptometer</a> (1887)</li>
<li><a href="The_Millionaire_(calculator)" title="The Millionaire (calculator)">The Millionaire</a> (1893)</li>
<li><a href="Slide_calculator" title="Slide calculator">Slide calculator</a> (1920)</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Pinwheel_calculator" title="Pinwheel calculator">Pinwheel</a> and<br><a href="Leibniz_wheel" title="Leibniz wheel">Leibniz wheel</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Stepped_reckoner" title="Stepped reckoner">Stepped reckoner</a> (1673)</li>
<li><a href="Arithmometer" title="Arithmometer">Arithmometer</a> (1820)</li>
<li><a href="Arithmaurel" title="Arithmaurel">Arithmaurel</a> (1842)</li>
<li><a href="Odhner_Arithmometer" title="Odhner Arithmometer">Odhner Arithmometer</a> (1873)</li>
<li><a href="Curta" title="Curta">Curta</a> (1948)</li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Calculator" title="Calculator">Electronic</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Desktop</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Sumlock_ANITA_calculator" title="Sumlock ANITA calculator">ANITA</a> (1961)</li>
<li><a href="Victor_3900" title="Victor 3900">Victor 3900</a> (1963)</li>
<li><a href="Monroe_Epic" title="Monroe Epic">Monroe Epic</a> (1964)</li>
<li><a href="Programma_101" title="Programma 101">Programma 101</a> (1965)</li>
<li><a href="Elka_22" title="Elka 22">Elka 22</a> (1966)</li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Pocket</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="HP-35" title="HP-35">HP-35</a> (1972)</li>
<li><a href="TI_SR-50" title="TI SR-50">SR-50</a> (1973)</li>
<li><a href="TI-30" title="TI-30">TI-30</a> (1976)</li>
<li><a href="Casio_fx-7000G" title="Casio fx-7000G">Casio FX-7000G</a> (1985)</li></ul>
</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Software_calculator" title="Software calculator">Software</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Calculator_(Apple)" title="Calculator (Apple)">Apple</a>
<ul><li><a href="Grapher" title="Grapher">Grapher</a></li></ul></li>
<li><a href="Atari_Calculator" title="Atari Calculator">Atari</a></li>
<li><a href="Desmos" title="Desmos">Desmos</a></li>
<li><a href="GNOME_Calculator" title="GNOME Calculator">GNOME</a></li>
<li><a href="KCalc" title="KCalc">KCalc</a></li>
<li><a href="NuCalc" title="NuCalc">NuCalc</a></li>
<li><a href="Windows_Calculator" title="Windows Calculator">Windows</a></li>
<li><a href="WRPN_Calculator" title="WRPN Calculator">WRPN</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Historical</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Antikythera_mechanism" title="Antikythera mechanism">Antikythera mechanism</a></li>
<li><a href="Salamis_Tablet" title="Salamis Tablet">Salamis Tablet</a></li>
<li><a href="Yupana" title="Yupana">Yupana</a></li></ul>
</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div>
<ul><li><b><span class="nowrap"><span class="skin-invert-image noviewer" typeof="mw:File"></span> </span><a href="Portal%3AMathematics" title="Portal:Mathematics">Mathematics portal</a></b></li>
<li><span class="noviewer" typeof="mw:File"><span title="Category"></span></span> <b>Category</b></li>
<li><span class="noviewer" typeof="mw:File"><span title="Commons page"></span></span> <b><a href="https://commons.wikimedia.org/wiki/Calculator" class="extiw external" title="commons:Calculator">Commons</a></b></li>
<li><span class="noviewer" typeof="mw:File"><span title="WikiProject"></span></span> <b>WikiProject</b></li></ul>
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