Hello all,

 

An off-the-wall question perhaps.  Recently, I've noticed an annoying behavior on some freeware aircraft and autopilots (POSKY 747-100/200, RFP 747-200 and CRJ-200, for instance).  Capturing altitudes above 15,000-20,000 feet results in some odd, sharp oscillations momentarily when acquiring an altitude.  For instance, in a climb at about 1500-1800 FPM, at 300 feet below my target altitude, the aircraft will start to pitch down reduce climb but overreact then sharply pitch back up and hold 500 FPM.  At 100 feet below my target altitude, the autopilot will sharply pitch up a few degrees then immediately back down to level and finish leveling off.  Lower altitudes capture just perfectly with no brief, abrupt oscillation.

 

I've tried adjusting pitch velocities, acceleration, as well as lo/hi_alt_breakpoints and pitch MOI in the aircraft.cfg and some values in .air files with no luck.  Does anyone have any suggestions on what the problem may be here or possible fixes?  (Payware aircraft, and the more complicated freeware aircraft work just fine for me, so maybe it's a default autopilot derivative type of issue).

 

Thank you.

This forum is more for the design of aircraft and I think your question would be best answered in the FSX forum so I'm moving it there to see if someone there can help you.

 

Best regards,

Jim

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This forum is more for the design of aircraft and I think your question would be best answered in the FSX forum so I'm moving it there to see if someone there can help you. Best regards,JimThis is an automatic message.This topic has been moved from "MSFS Aircraft and Panel Design Forum" to "MS FSX Forum". This move has been done for a number of possible reasons.

• The most likely reason is that the post was off topic.
• The topic could also have contained images or a video that were not appropriate to the original forum it was posted in.
• The images might not have been "illustrative" or "explanatory" in nature.
• The topic could have been moved because we deemed it to be more appropriately placed elsewhere.

Please ensure that your posts are "on topic" and contain illustrative images or videos as appropriate. Do not post videos or images just for entertainment purposes anywhere but in the screen shot or video forums.Members who continue to post off topic posts can be denied entry to specific forums in order to reduce and remove the practice. Your cooperation is appreciated.

Ehh I would argue since I'm trying to code autopilot behavior (or at least the right

combination of .cfg and .air variables on freeware autopilots between MOI, acceleration, and lo/hi break altitude variables) it would be aircraft design forum experts who could likely help but OK.