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Predicting Performance

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.

dylan-gallegos
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Predicting Performance

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  1. Predicting Performance

  2. Density Altitude • Pressure altitude corrected for nonstandard temperature

  3. Density Altitude • High • Hot • Humid

  4. Density Altitude • Common methods of calculating include: • Flight computer • Density Altitude Chart

  5. Density Altitude • Moisture - effects not shown on performance charts • High Humidity - engine horsepower reduction of 7% • Takeoff and Climb performance 10%

  6. Surface Winds • Headwind or tailwind component • a 10 knot headwind might improve performance by 10% • a 10 knot tailwind might degrade performance by 40%

  7. Surface Winds • Crosswind component • Demonstrated crosswind component

  8. Runway Conditions • Gradient • greater than .3% it will be listed in A/FD • Braking Effectiveness • good, fair, poor, and nil • Hydroplaning

  9. Hydroplaning • Dynamic Hydroplaning • = X 8.6 • = 30 X 8.6 = 47 Kts PSI

  10. POH • Prior to 1979 Owners Manual varied in content and format

  11. Determine the density altitude for these conditions Altimeter Setting……………30.35 Runway Temperature………+25oF Airport Elevation……3,894 ft MSL

  12. 2,000 feet

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

  14. 15 knots

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

  16. 10 Knots

  17. Performance Charts • Experience Test Pilots • Factory new Airplanes • Repeated Tests using Best Results • Format -Table -Graphic

  18. Takeoff Charts • Ground Roll • Distance to clear a 50 foot barrier

  19. Rate of Climb • Takeoff power • Maximum continuous power • Temperature • Pressure Altitude • Airplane Weight

  20. Rate of Climb • Provide information on time, fuel and distance required to climb from one altitude to another • Subtract values from starting altitude

  21. Cruise Charts • Range is the distance an airplane can travel with a given amount of fuel • Endurance is the length of time the airplane can remain in the air

  22. Cruise Charts • Maximum range is at L/Dmax or best glide speed • Maximum endurance is about 76% or best glide speed • Generally close to stall speed

  23. Descent Charts • Not found for most aircraft • Often overlooked by pilots • As you start flying higher and faster, you must start planning your descents farther from the intended point of landing

  24. Glide Charts • With 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

  25. Stall Speeds • As angle of bank increases, stall speed increases • As flap deflection is increased, stall speed decreases

  26. Landing Charts • Ground roll • Over a 50 foot obstacle

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