Fsbuild-2 Flight Planner

Hi Ernie,

I couldn't find much about this in the various documents, so could you please say a couple words about how fuel burn is calculated in climb and descent? For instance, is it still true that the climb fuel for a leg is obtained by looking in the .prf file for the figures at the projected altitude at the waypoint in question? Is there any integration done between fuel burn at different waypoints in the climb phase? If my departure bias is 0, is there still some 'takeoff fuel' value added to the climb figures?

My reason for asking is that I can't seem to create a .prf file that gives accurate fuel data for the climb and descent phases when compared to the figures in the real world flight planning and performance manuals... If I use instantaneous fuel flow values in the .prf the climb fuel burnoff is much too low (unless perhaps if I add dozens of densely spaced waypoints in the climb phase, but I don't want to do that), whereas if I use integrated data from the enroute climb tables the burnoff is much too high (e.g., 3,900 or 10,500 kg respectively, while the actual figure should be 6700 kg). Hope that made sense...

If I only knew exactly how the calculations are done, I could easily tune the .prf to work properly!

Thanks!

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Best,
- Björn