RE: UCD 60 knife edge advice please!
Thanks for all the comments guys, I value your experience.
I take the point from those that say their UCD 60 was always difficult in KE, but that wasn't the case with my last one. Sure I know the elevator compensation is non-linear, but previously with 10% up elevator and 5% opposite aileron it was tamed enough for easy further control by hand (thumbs!). I could have emptied a tank flying KE circuits if I wished. This one is very, very fierce in the pull to the u/c and also has a pronounced roll tendency. The combination is such, and is so sensitive to the controls around that point that I can't maintain it for long. My point is that something is different about this one and I'm just digging around to get some ideas.
Since the last one is destroyed I can't check exactly where I previously ended up with the CoG or stabiliser incidence and I'm just going on memory. I do remember I needed some down elevator at one point during landing.
Although I do add some throttle during KE, I can't see any obvious down thrust which might contribute to the problem. Basically this model is built using the same parts from the old model, horns in the same place, same length linkages, same model and mixes selected in the Tx, balance the same as far as I can judge etc. I guess my memory on this last could be suspect. Usually I just adjust the CoG on any model to get a comfortable balance between agility and stability.
I think I'll start by nudging the CoG forward a little, and then experiment with aileron droop - both those are easy to try. It would be easy enough to drop the hor stab, but I'd be happy just with the manageable coupling I had before.
Thanks again
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S