said in
Pay attention that during this period FLongN is a bit positive which means the pilot still gives some input therefore the analysis will be biaised
During this time, the PSI angle (heading) has built up to 50 degrees deviation,
you can also see that the pitch rate (q) is also building up while rolling, which is due to both FLCS commanding pitch , pilot input AND inertia coupling
As a matter of fact, this test has been performed in order to test the Roll limiters systems (A , B, C ) and to measure their resistance on the inertia coupling during those manoeuvers
So , your “proof” is actually only a proof that you misinterpreted the meaning of theta angle.
as this test is performed with pilot stick input, we cannot demonstrate really anything on the matter.
the only thing we know is that the FLCS commands 1G pitch up all the time, and particularly when rolled at 90 deg, which provokes heading deviation
I have been further studying tp1538…
I have reached some conclusions.
First of all, Do you even realize that TP1538 uses aerodynamic data derived from a wind tunnel testing of a scaled down model?’
To add to this, the report is dated from 1979, so old that from then till today there have been numerous updates to F16 FLCS in different blocks. Not to mention that the study uses three different control systems we are not even sure if they are actually exactly the same as the ones used by the real aircraft ( we only assume that control system A mentioned might be the type that the Viper uses) the report is also only valid to mach 0.6 and the alpha is limited but that is of little concern.
That means we are actually discussing approximations…
However, if we put all this aside. we can still perhaps reach some possible conclusions.
Concerning Bank to Bank task mentioned in the document.
You support that Flong is positive (data is biased)
I partly agree, but that means that he actually pulls the stick not that he pushes. Also if you look at the key moments of interest, for example at the 8-10 sec, the exact moment test reaches 70 degrees of bank Flong is near 0… ( Figure 56, Page 198 or 202 in PDF’s numbering)
What is also more important is δhor which doesn’t seem to change very much besides negligible fluctuations of little importance. That means FLCS is actually still keeping the plane stable and is partly ignoring Pilot input
Now, if you understand that θ (Thi) is the true indication of heading change when an aircraft is banked, I am sure you will arrive at a revelation…
As a matter of fact, I am in the process of making a BMS evaluation data chart recording, to compare the results.
It is difficult though as TacView has limited telemetry data and I am still at the process of figuring this out.
I ignore all the insults you have mentioned, for the scope of perhaps achieving a better flight model. Actually I have learned a lot from this and I actually thank you
PS: next week I will have again the chance to visit the Lockheed Martin simulator. I am sure I can make a video of myself attempting knife edge. Are you interested at all?