Rongor Posted yesterday at 12:34 AM Posted yesterday at 12:34 AM Cruise and TAS boxes don't really correspond well in regard to RaNGe and ENDurance. In my example best range Q is shown as 64% TRQ in the Cruise box, while the TAS box is showing 117 kts as the maximum range speed. Max endurance Q is supposed to be 41% at a speed of 71 kts. Lets focus on maximum range speed, 64% at 117 kts. Bottom line is, these tandem values are impossible to achieve in DCS. With a TRQ of 64% I merely achieve 104 kts in level flight (I even allowed a slight descend to keep that speed), so around 12% lower speed than required for maximum range as per the TAS box info. Also the fuel flow in the Cruise box for 64% Q is predicted 991. Checking on the Fuel format page, the calc flow for the current 64% is 1170 in total, which is 18% above the prediction of the PERF format page. Brad mentioned in discord that drag can affect the values. But I am a bit surprised to see the deviations being that enormous. Even in case the prediction fails to be accurate, how can predicted Q and speeds mismatch that far? No, I can't provide any real world data on "how it should be". Rather I am clueless if this is wanted as designed and want to bring this to your attention in case a further refinement is required. Its the size of difference, which lets me doubt that this is correct. Yet maybe it is? If these deviations are realistic, I am curious how the PERF data can be of use in any meaningful way IRL when in fact the values are unreliably off from the actual state of your flight. I wouldn't even know what to actually aim for when attempting maximum range flight, 64% torque or 117 kts? Or are these parts of the PERF page ignored IRL due to their inaccuracies and at least for maximum endurance I rather have to rely on the SFR of the FUEL page? This is a few moments of my flight, before the screenshot above was made. (unlisted video) 1
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