predicting performance

Download Predicting Performance

Post on 04-Jan-2016




0 download

Embed Size (px)


Predicting Performance. Density Altitude. Pressure altitude corrected for nonstandard temperature. Density Altitude. High Hot Humid. Density Altitude. Common methods of calculating include: Flight computer Density Altitude Chart. Density Altitude. - PowerPoint PPT Presentation


  • Predicting Performance

  • Density AltitudePressure altitude corrected for nonstandard temperature

  • Density AltitudeHighHot Humid

  • Density AltitudeCommon methods of calculating include:Flight computerDensity Altitude Chart

  • Density AltitudeMoisture - effects not shown on performance chartsHigh Humidity - engine horsepower reduction of 7%Takeoff and Climb performance 10%

  • Surface WindsHeadwind or tailwind componenta 10 knot headwind might improve performance by 10%a 10 knot tailwind might degrade performance by 40%

  • Surface WindsCrosswind componentDemonstrated crosswind component

  • Runway ConditionsGradientgreater than .3% it will be listed in A/FDBraking Effectivenessgood, fair, poor, and nilHydroplaning

  • HydroplaningDynamic Hydroplaning= X 8.6

    = 30 X 8.6 = 47 Kts PSI

  • POHPrior to 1979 Owners Manual varied in content and format

  • Determine the density altitude for these conditionsAltimeter Setting30.35Runway Temperature+25oFAirport Elevation3,894 ft MSL

  • 2,000 feet

  • The surface wind is 180 at 30 knots.What is the crosswind component for a RWY 15 landing.

  • 15 knots

  • The surface wind is 180 at 20 knots.What is the headwind component for a RWY 12 landing.

  • 10 Knots

  • Performance ChartsExperience Test PilotsFactory new AirplanesRepeated Tests using Best ResultsFormat -Table -Graphic

  • Takeoff ChartsGround RollDistance to clear a 50 foot barrier

  • Rate of ClimbTakeoff powerMaximum continuous powerTemperaturePressure AltitudeAirplane Weight

  • Rate of ClimbProvide information on time, fuel and distance required to climb from one altitude to anotherSubtract values from starting altitude

  • Cruise ChartsRange is the distance an airplane can travel with a given amount of fuelEndurance is the length of time the airplane can remain in the air

  • Cruise ChartsMaximum range is at L/Dmax or best glide speedMaximum endurance is about 76% or best glide speedGenerally close to stall speed

  • Descent ChartsNot found for most aircraftOften overlooked by pilotsAs you start flying higher and faster, you must start planning your descents farther from the intended point of landing

  • Glide ChartsWith GPS and the ability to have navigation data to the nearest airfield with the touch of a button, you should be able to mentally calculate if you can glide to the nearest airfield

  • Stall SpeedsAs angle of bank increases, stall speed increasesAs flap deflection is increased, stall speed decreases

  • Landing ChartsGround rollOver a 50 foot obstacle


View more >