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Terrain Following or Bouncy Castle

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MashTrapper View Drop Down
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    Posted: 15 May 2016 at 6:05pm
Am I doing something wrong or is it too much to hope for?

I managed to get good results with Terrain Following exactly once, in Hawaii over some rugged and challenging terrain. That lasted for about 10 minutes and it was quite exhilarating. It was navigating mountains beautifully.

That was after many, many failed attempts both before and since. Most of the time, the Bouncy Castle effect moves increasingly beyond Clearance knob setting and into the ground. Other times, turning on Terrain Following just results in an instant fiery crash into the terrain from whatever altitude I was at when I engaged it. I've been at 10,000 feet and BOOM! ground contact.

Failures happen regardless of whether I perform manual start or hit the auto-start button, or just start flying right after loading up.

So my question is: am I missing something or is this pretty much what's expected?
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kevinh View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kevinh Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2016 at 6:13pm
I don't think you are missing anything, that's what I get too. Even when it is holding height above terrain I get a constant porpoising oscillation. That certainly isn't right. Basically TF and RH modes are unusable as they are. I'm sure with some autopilot tuning it could be fixed.

I haven't seen failures though.

Kevin
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MashTrapper Quote  Post ReplyReply Direct Link To This Post Posted: 17 May 2016 at 12:47am
Yeah, seems like terrain following was an idea that didn't, but hopefully will get adequate attention.

By failure I meant failure to keep the plane off the ground. I didn't mean system failure. That was a bad choice of words on my part.
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kevinh View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kevinh Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jun 2017 at 11:05pm
Any chance this will ever get fixed?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Henry_W Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jun 2017 at 7:46pm
Same problem here. When using TF, sometimes the Tornado keeps the height above ground, while very violently pitching up and down, sometime it crashes into the ground. What I did observe is that even while flying over flat “ground” (e.g. a big lake or the sea), it is always descending, even though the altitude is constant. The path vector in the HUD indicates approximately 2 degrees below the horizon and the VSI indicates a constant descend rate of 600 ft/min. When you watch the aircraft from external view, you see the landscape constantly jumping down, so that the plane must keep descending in order to remain at constant altitude. Weird. When using altitude hold all is fine, but TF and RH are giving the above-mentioned problems.

Still a wonderful plane, though.

Best regards,

Henry
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