feat(lnav): LNAV Tuning

[747-4EVER]

Changes some values in LNAV director to hopefully improve tracking and turning performance.

INSTRUCTIONS FOR TESTING:

Observe turning performance on ND.

Try to observe across the whole speed range of the aircraft and a range of angles from shallow to sharp turns.

Be mindful when judging performance to check that the turn is actually achievable, i.e abiding by SID/STAR speed restrictions.
Even with the best tracking in the world it will not be possible to complete a turn if you are too fast for a published procedure.

Please provide feedback if you see a trend of undershooting or overshooting and by how much.

Note: The tracking should be improved but will not be 100% accurate. A small error (below 0.5nm or so) on rollout is acceptable as long as the aircraft corrects itself in a timely manner without meandering multiple times around the route.

[TJCAviation]

Name: Tobias J Cook#6576
Date of testing: Current date 30/06/2022
Version of the sim: Latest version
PR Tested: #455

Steps you've made to test the Pull Request:

Select Salty 747 in Aircraft Selection
Flew a normal flight plan entered via simbrief
observed LNAV accuracy via Navigraph Charts app and volanta.
Overall Rating: Passed
Conclusions of the testing: LNAV is better than before , slight overshoots here and there but 9/10 it is bang on. Image below shows the worst overshoot I had, and it still wasn't that bad

[brewers10]

Name: brewers_10#5706
Date of testing: 11/08/2022
Version of the sim: Latest Version of Sim Update 9
PR Tested: #445

Testing technique: Loaded into Birmingham (EGBB) runway 33. Flight from EGBB --> EGCC. ADMEX1M departure and HON1H hotel arrival. A good variety of turns at differing speeds so perfect for testing LNAV.

Steps you've made to test the Pull Request:

1. Loaded into EGBB
2. Loaded the ADMEX1M and HON1H SID and STAR into the FMC
3. Departed EGBB
4. Observed how well the LNAV coped with the initial climb out then right hand loop toward ADMEX.
5. Entered the HON1H arrival into EGLL, observed how the LNAV coped with the twists and turns into London.

Overall Rating: Good
Conclusions of the testing: Tended to not work so well at slow speeds (such as after passing Bovingdon for the approach). Other than that really impressed.

NOTE: Speeds were inputted according to the charts. 220 knots on the initial turn. 250 knots on the turn from ADMEX. 220 at BNN and then I manually reduced speed as though I were being vectored by ATC.

NOTE 2: Video time-lapse available of entire flight on the link; with enlarged display. Please slow the video down to get the details :) -->
https://clipchamp.com/watch/itByVdHsUHD

[DesertRick13]

Quick hop from TJSJ to TNCC. Much smoother turning from one waypoint to another. However, for some reason, LNAV cut out at about 120NM from TNCC. LNAV was still indicated, and there were no discontinuities. After selecting heading to return to the LNAV path, LNAV took back over when it should have, and flight continued on without further incident. I will try on another flight to see if this reoccurs or is simply a one-off.