66 lines
2.9 KiB
Markdown
66 lines
2.9 KiB
Markdown
# Adjustments
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- Dropped idle thrust so so that aircraft doesn't start rolling when not nearly
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empty
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- Affected by `n1_and_mach_on_thrust_table`
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- Adjusted idle down on 0 mach entries only
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- Smoothed low end
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- Adjusted mach 0 curve to end at 1
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- Adjusted mach 0.25 curve to have a similar end to mach 0
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- Adjusted mach 0.74 curve to have a similar end to the surrounding
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- Spool behaviour after 90 N1
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- Affected by `corrected_n2_from_ff_table`
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- Set idle N2 FF value directly
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- Made linear until original max
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- EGT
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- Affected by `itt_peak_temperature`, `itt_tc`, `egt_peak_temperature`,
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`egt_tc`, `egt_tuning_constant`, `fuel_flow_max_itt_factor`,
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`fuel_flow_min_itt_factor`, `itt_maxcorrection`
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- At ISA, SL, 60C, EGT does not exceed 960C TO
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limit
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- Used online references to achieve idle EGT
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- Used Saudi FCOM for high altitude EGT
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- This may be unachievable due to the non changeable cooling of the game
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- Disabled sim protections
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- Affected by `max_n1_protection`, `max_n2_protection`, `max_egt_protection`
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- All set to zero
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- SDK conformance
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- Affected by `fuel_flow_gain`
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- Set to zero as the SDK indicated one ought to
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# Additions
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- New ground contact model
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# Observations
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The defined N1 and N2 max values are too low. as per EASA TCDS, the CF6-80C2D1F
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has a N1 max of 117.5 and a N2 max of 112.5. I do not know why the lower limits
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were chosen, it may be in our interest to adjust this to the actual limits.
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This may also influence the WASM since FADEC response and thrust limit
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selection may need to be adjusted to allow values higher than currently
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possible.
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The curves that `n1_and_mach_on_thrust_table` look very strange. I do not fully
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understand how these were generated, and more importantly, why they have these
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shapes. Specifically the plateau and the bump at 25 N1 for the higher machs are
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odd. Comparisons with other addons yielded mixed results, however all of those
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curves did not have (or only in regimes unattainable during higher machs) such
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oddities.
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Also to note is the drop in thrust for 120 N1 at mach 0 and mach 0.25. This
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seems backwards to what physics would suggest, with higher RPM generating more
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thrust.
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The curves for `n2_to_n1_table` end in a rather sharp plateau. Without knowing
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how the actual CF6 behaves, this may be closer to reality than a pure
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logarithmic relation of N2 to N1 would suggest.
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`corrected_n2_from_ff_table` is an oddball. If the game is told to not use this
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table, a default logarithmic curve is used instead. The modifications done here
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do not follow this due to the WASM FADEC imposing a non linear spool behaviour
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itself. It is to note however, that the sharp upturn at the end of the original
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lead to a noticeable increase in spool past 90 N1, after first seemingly
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slowing down at 75 to 80 N1.
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# TODO
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- EGT, try higher ITT with new tuning params
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- New ground contact MTOW sponginess
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- New ground contact high speed stickyness
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- AND trim issue |