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NGX, TopCat, assumed flex temp etc

Fi5kuS
in The Prepar3d Forum

Featured Replies

Hi.

 

So I have been getting PFPX and Topcat to match perfectly now in terms of ZFW. It does not 100% match the value I obtain when I load the numbers in the NGX FMC, but it is only a matter of 0.2-0.4 difference.

 

However, I want to get more serious using the takeoff-performance data from Topcat. Normally, I just enter flaps setting, thrust config etc and calculate performance data based on a certain runway. This gives you a set of assumed flex temperatures, usually de-rated. My understanding of these values are really poor and I don't know what values that are relevant and to be used in the takeoff-performance page in the FMC.

 

Can someone elaborate on this topic, and moreover, explain how you obtain similar (or preferably equal) values in Topcat and the NGX FMC. 

38.jpg

Brynjar Mauseth 

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