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"System Mass Integrating Time & Height" © (SMITH) where Performance = Control ©.
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Maximum Takeoff Weight: 1,670 Pounds.
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Barnes County Municipal (6D8). Valley City, ND.
Elevation: 1,400 Feet
Temperature: 26.2C/79.2F
Pressure Altitude: 1,390 Feet
Density Altitude: 2,997 Feet
The following conditions are the basis for data:
1) Flaps - - 10 DEGREES
2) Throttle - - FULL PRIOR TO BRAKE RELEASE
3) Runway - - PAVED, LEVEL, & DRY
4) Field ELEV > 3,000 Feet - - MIXTURE LEANED (see POH)
5) Wind - - ZERO
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Starting at zero, you used 875 feet to achieve liftoff velocity. After liftoff you displaced an additional distance of 644 feet (total distance 1,519 feet) to acquire 86 feet AGL. This represents an average 570 ft/min climb rate. With each progressively higher density altitude, trends begin to emerge. The FAA refers to this as "all encompassing." Reduced propeller efficiency, decreased engine thrust, and aerodynamic losses are the markers for high density altitude performance. Fortunately, we can make reliable predictions for these conditions.
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