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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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The pilot-in-command has preflight responsibilities:
1) Weather Briefing - - OBTAIN
2) Airport Runway Analysis - - PERFORM
3) Pre-Planning - - ALL AVAILABLE INFO (FAR 91.103)
4) Flight Planning - - GO/NO GO DECISION
Imperial County (IPL). Imperial, CA.
Elevation: -55 Feet
Temperature: 15.5C/59.9F.
Pressure Altitude: -55 Feet
Density Altitude: -9 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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Like a regulated airliner, runwaydata.com emphasizes two takeoff segments. The initial takeoff segment is where we accelerate to liftoff velocity. The "takeoff climb" segment begins at liftoff and ends at one nautical mile. Instrument departure procedures often prescribe minimum climb gradients. The concept of climb gradient should be clearly understood by any pilot planning a high density altitude takeoff. These data formats begin with a "true zero" and are referred to as "ratio data." Starting at zero, you used 725 feet (see graph at top of page) to achieve liftoff velocity. After liftoff you displaced an additional distance of 794 feet (total distance 1,519 feet) to acquire 105 feet AGL. This represents an average 695 ft/min climb rate.
Congratulations on achieving first segment "positive rate" climb! If a climb restriction requires a minimum climb capability of 350 feet per nautical mile, the calculation is easy. If we divide 350 by 0.069, we obtain 5,072.5 feet (horizontal distance traveled). By inspection, 5,072.5 feet is less than one nautical mile (6,076 feet). The 350 feet/nm climb restriction can be achieved.
When you ask for a standard weather briefing, you are given an option to hear NOTAM information. If a 120 foot crane is located 3/4 of a mile away, you can at a glance discover the utility for analyzing your takeoff climb gradient. Professional pilots always analyze! Obviously you would see and avoid this obstruction, but the data provides basis for investigation. Runwaydata.com provides "takeoff climb" segment charts. This should not be confused with an "enroute climb" chart. "Takeoff Climb" segments are thoroughly analyzed by the airline industry.
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