During
obstacle clearance calculations, our software simultaneously uses
runway analysis
and obstacle analysis, to arrive at an answer that gives you the
best takeoff weight
possible under the given conditions. When the weight has to
be reduced, the Accelerate-Go Distance decreases
while the available climb gradient
increases. Including the unused runway, the
required climb gradient decreases.
Attempting to do such calculations by hand can
be overwhelming, but our software
does it accurately in a split second!
Clearing an obstacle:
In this scenario the maximum takeoff weight allowed
was determined as follows:
The program searches for the highest possible aircraft
weight which allows the aircraft
to clear the obstacle by a minimum of 35 feet. In this
example it was determined that this
optimum weight (8922 lbs) will result in an accelerate-go
distance of 3200 feet, leaving
1033 feet of unused runway. Add this unused runway
distance to the obstacle distance
of 1850 feet and the total distance from the end of
accelerate-go portion to the obstacle is
now 2883 feet. Thus, the minimum takeoff gradient required
in order to clear this particular
obstacle is 6.9% (height of 200 feet and distance of 2883
feet). This is illustrated in the
diagrams below.
Without taking into account the unused runway, the
minimum required takeoff
gradient is 10.8% In order to achieve this climb
gradient the takeoff weight would
have to be reduced to 7220 lbs. At this low weight
one is not fully taking advantage
of this airplane’s capabilities.
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© 2009-2010 AFM Solutions
Taking into account the unused runway, the
minimum required takeoff gradient is 6.9%
allowing the aircraft to takeoff with a weight of
8922 pounds and safely clear the obstacle.
Note that the Takeoff Climb Gradient chart does
not provide any information regarding Headwind
Corrections or Tailwind Corrections. The Climb
Gradient values used in computations are zero-wind values.
Some screenshots of Windows versions:
Pick a color for each page for easy airport identification
Save your data and later retrieve it all with just a click
Or if you are working in a low light environment select a Night View Mode
to make it easier on your eyes in preserving the night vision
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