![]() The pressure altitude is the altitude an aircraft altimeter would read at our location if the reference pressure on the altimeter were set to the current sea-level barometric pressure. However, it will get you pretty close if you don't have a Kestrel or other weather meter to do the calculation for you.įirst we must calculate the pressure altitude, because barometric pressure varies, which affects the pressure altitude. Your Kestrel includes humidity in its calculation of density altitude. This article is an addition to and continuation of the method of using density altitude in computing ballistic performance, Making Ballistic Cards Using Density Altitude To calculate takeoff distances under different conditions, use the Back button to return to the appropriate dialog box and enter new information, or click Cancel to close the calculator.Ads are chosen by Google and not necessarily endorsed by this website. Then the runways are listed in order of shortest takeoff distance, along with any values calculated for wind and surface conditions. Read the Warning Note that displays and click OK.Įffects of density altitude and weight on the aircraft’s standard takeoff distance are displayed first. The field Density Altitude is calculated and displayed. ![]() Select either Field Pressure Altitude or Altimeter >setting. The completed dialog box should look something like this:įor winds, select Calm or Direction, and enter Direction in degrees and Speed in knots.įor runway conditions, select Firm Surface, Soft Surface (or wet), or Very Soft Surface (snow or mud). Take Off Weight and Max Take Off Weight are entered automatically from your flight plan and aircraft model respectively. If you want to change the aircraft, see Modifying and Adding an Aircraft Model in the RoutePack.Įnter the following information for the next three fields: If you used the right click option from the RoutePack list, the aircraft specified is associated to your RoutePack. If applicable, select your aircraft from the drop down menu. The Aircraft Properties dialog box uses information found in your Pilot's Operating Handbook. Click Next after each screen to continue, or choose Back to revise your entries and check different conditions. #DENSITY ALTITUDE CALCULATOR SERIES#Using the Takeoff Distance CalculatorĮnter information in a series of three dialogs and see the results in a fourth. ![]() ![]() The calculator does not use specific information from a specific aircraft's operating handbook.īecause this tool is meant for non-turbocharged propeller-driven aircraft, some calculations, such as the effect of density altitude, may not apply to large turbine or jet aircraft. Computed takeoff distances are listed in order of shortest length, giving the pilot a recommended runway, and values are shown for the effects of density altitude, aircraft weight, runway surface, wind and crosswind components. This tool uses standard engineering formulas to determine how density altitude, wind, weight, runway surface and runway slope affect an aircraft's takeoff performance. Right-click an airport under a route in the RoutePack List, and choose Takeoff Calculator from the shortcut menu. Right-click on any airport in the Enroute Charts view, and choose Takeoff Calculator from the shortcut menu. ![]() Use one of the following methods to open the calculator: Takeoff Distance Calculator Takeoff Distance Calculator ![]()
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