Transcript Predicting Performance - Kansas State University

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
• Moisture - effects not shown on
performance charts
• High Humidity - engine
horsepower reduction of 7%
• Takeoff and Climb performance
10%
Surface Winds
• Headwind or tailwind component
–a 10 knot headwind might improve
performance by 10%
–a 10 knot tailwind might degrade
performance by 40%
Surface Winds
• Crosswind component
• Demonstrated crosswind
component
Runway Conditions
• Gradient
–greater than .3% it will be
listed in A/FD
• Braking Effectiveness
–good, fair, poor, and nil
• Hydroplaning
Hydroplaning
• Dynamic Hydroplaning
•=
X 8.6
PSI
•=
30
X 8.6 = 47 Kts
POH
• Prior to 1979 Owners Manual
varied in content and format
Determine the density altitude for
these conditions
Altimeter Setting……………30.35
Runway Temperature………+25oF
Airport Elevation……3,894 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 Charts
• Experience Test Pilots
• Factory new Airplanes
• Repeated Tests using Best
Results
• Format -Table -Graphic
Takeoff Charts
• Ground Roll
• Distance to clear a 50 foot
barrier
Rate of Climb
• Takeoff power
• Maximum continuous power
–Temperature
–Pressure Altitude
–Airplane Weight
Rate of Climb
• Provide information on time,
fuel and distance required to
climb from one altitude to
another
• Subtract values from starting
altitude
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
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
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
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
Stall Speeds
• As angle of bank increases, stall
speed increases
• As flap deflection is increased,
stall speed decreases
Landing Charts
• Ground roll
• Over a 50 foot obstacle