Take off roll issue
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I have been having a persistent issue with the Arrow. In order to troubleshoot I just reinstalled a fresh version of PA-28R, v0.9.0 and checked my rudder pedal function/ calibration.
I am experiencing a persistent jerk or abrupt swerve to the left just before takeoff. I have tried takeoffs with and without back pressure on the yoke and there is no change. It occurs at about 70 KIAS. It does not occur with other stock, small GA aircraft with tricycle gear like the C172 or Robin and does not occur with the Aviat Husky in the sim.
Any ideas or suggestions would be appreciated. Thanks,
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Use enough back pressure on the yoke to get the nose slightly off the ground around 60 knots. That seems to work around the problem pretty consistently for me.
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Thanks, BernieV. I will try it. Very helpful.
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I have experienced the same issue on my side as well. Will try out @BernieV 's solution. I don't recall if it happens at 60 knots or 70 but I roughly recall that it doesn't happen if I am using flaps.
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@peto-toobe Try this simple modification to the flight_model.cfg file...
[CONTACT_POINTS]
min_castering_angle = 0 ;0.05236 ; Defines the minimum angle a free castering wheel can take (in radians).
max_castering_angle = 0 ;3.14159265358979 ; Defines the maximum angle a free castering wheel can take (in radians). -
@retiredman93231 I'll have to give that a try. Thanks for the tip. It is probably worth noting that the Arrow's front wheel is not free casting.
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@berniev Yes, we know - As I said in an email to RetiredMan, I actally looked at it a while back but my head was in P3D at the time and in that sim the steering / free castoring is entirely dealt with in the Contact Points steering angle, and angle other than 180 means no free-castoring at all.
The extra lines seem to override that, in a similar manner to a fixed-undercarriage aircraft I was working on which kept sinking on landing as if there was no gear. After a lot of testing, I found that the sim's inbuilt Aircraft Editor, if used at all, was automatically overwriting the 0.0 in extension and retraction times with a default value of 3 seconds and that was enough to convince the sim that the gear was retractable, so once you got above a certain speed it would either retract or fail (still not sure which).
This sim is still throwing up anomalies!
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@delta558 Thanks for taking the time to explain. For what its worth, from memory, the maximum steering angle of the Arrow is +/- 20 degrees.
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@retiredman93231 I guess this setting helps. I was able to takeoff without lurching with crosswinds at 17 kts 90 degrees from the left and from the right, although there was more a tendency to weathervane into the wind when the cross wind was from the right. I even tried 30 knot crosswinds and it really didn't feel much different than 17. In real life that would have been a harrowing experience
I was hoping that improvements to adverse yaw modeling might help better simulate the effects of aileron deflection during the takeoff rolls, but unlike real life, aileron deflection doesn't seem to have much impact on countering weathervaning during takeoff with a crosswind in this or prior versions of MSFS.
