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Indiafoxtecho avatar image
Indiafoxtecho asked Indiafoxtecho commented

Miscellaneous fly-by-wire issues

Following our latest F-35 update, a number of users reported fly-by-wire issues - but we cannot replicate their problems. In general, however, it seems that the SDK is a little short on information on this system so here is a summary of the issues we are having (of course we assume fly_by_wire = 1 in the following examples):

a) fly_by_wire_from_flaps=1 change of control law conditions -> it is not clear if the flight control laws are supposed to change when the pilot deploys the flaps or they also change if flaps are automatically deployed or are maneuvering flaps

b) fly_by_wire_from_flaps=0 loss of control -> loss of control reported by some users just before touchdown (when flight control laws change)

c) fly by wire aileron not centered after some maneuvers -> after tight aerobatic maneuvers, it may happen that after the pilot recovers level attitude, the fly-by-wire remains "skewed" to a bank (either left or right). This can be recovered after maneuvering.

d) autotrim not working for some users -> this is a mistery for me. We can cause autotrim to lock by manually operating flaps on the ground on the F-35. When this happens it seems impossible to recover. However for some users the fbw autotrim simply does not work.

e) loss of control at high speeds -> some users are reporting loss of control/pitch down at high Ma number. We have seen this happening on the stock F/A-18 but could not replicate the issue.

f) reduced pitch authority at high speed -> some users are reporting reduced pitch authority above 0.80 - 0.90 Mach - with aircraft unable to pull more than 4 Gs.

g) extremely low pitch authority -> some users are repoting sluggish pitch behavior

Help to clarify these points will be appreciated as it is extremely important to simulate modern high performance military aircrafts.

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lyonhaart001 avatar image lyonhaart001 commented ·

Are you using the new version Flight model system or the original?

If you are using the new version, I wonder if it might be wise to switch back to the original MSFS Flight model version until the new version Flight system is refined? I say this because I couldnt get a plane to fly right last week, doing normal tunes did nothing. But then I changed it to original Flight Model settings and it flew great.

My theory is, it might have some bugs that just need to be ironed out. Then when its repaired, change it back to the new version in your jet(s).

Just a thought. Verify with others on that. I could be wrong.


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Indiafoxtecho avatar image Indiafoxtecho lyonhaart001 commented ·
We are only using "modern" flight models - if that is the question - general behavior seems OK. We tend to use manual editing of the .cfg files.
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