I've just watched the two videos that were uploaded earlier in the thread, and it's interesting.
I have a Spirit Pro on a Trex 700, and a Spirit 2 on a Goblin 700, and neither suffer in the same manner as shown - where what I might describe as a fast, tight elevator maneuver such as used to enter the initial part of a stall turn, or similar, results in a nose up/collective jump type behaviour, when the helicopter is vertical.
However, what both my helicopters do suffer from, but inconsistently and rarely, is a nose up/collective jump type behaviour - similar to that seen in the video, but when the helicopter is horizontal rather than vertical - and only when performing a fast, tight loop. Perhaps that is in some way related? Perhaps something to do with a fast, tight radius type maneuver?
My settings are somewhat different to those shared here, so I shall spend some time trying variations, once the weather allows.
The units are mounted entirely differently in terms of location on helicopter, and orientation of unit, and settings are similar, but different. I believe the sensors are somewhat different between the two units, too? If so, then it does start to sound like a hardware independent characteristic...
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