Flight-model changes in the 2019 PBR version

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Lapi
Posts: 2571
Joined: 26 Nov 2011, 02:00

Flight-model changes in the 2019 PBR version

Post by Lapi » 15 Apr 2019, 23:19

Flight-model changes in the 2019 PBR version are:

- Flap (slat) L&D values further tuned in order to achieve the required
pitch & N1 values to be within 0.05%-0.08 of the required margin
- Coefficient of Lift vs. Angle of Attack curve slightly changed for very low
and very high altitudes.
- Ground-effect has further changed, mainly for better auto-landings
- Variation of elevator deflection lift coefficient (CL de) due to mach is slightly higher.
- Flap values for SE landings (FLP-15) fine tuned
- Slat extraction speed further changed
- Mach coefficient of pitch due to pitch rate changed
- Roll moment coefficient (Cl) due to roll rate on mach decreased
- Corrected Thrust Factor vs CN1 changed above FL400
- Control surface effectiveness is less linear in effect with deflection up to a critical
angle of approximately 11.5-12.0 degrees.
- Delta Cmih due to mach, variation of pitch moment coefficient due to horizontal tail
incidence on mach is higher now.
- Scalar on roll moment coefficient (Cl) due to roll rate (p) on angle of attack is less linear now.
- Scalar on yaw moment coefficient (Cn) due to yaw rate (r) due to angle of attack is lowered.
- Variation of yaw moment coefficient (Cn) due to roll rate (p) on mach now goes from 0.0 to 3.2.
- Remaining fuel values in center-tank changed.
- Now CL_adot would add or subtract from CL(alpha) when alpha is changing relative to time.
It has negligible effect though when AoA changes slowly.
- CI_beta roll moment slightly increased.

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