We've been flying and testing v2.74b and v2.76 in a number of aircraft over the last three months namely two X8 flying wings, a Skywalker Condor 1880, a RvJet, a Multiplex Easyglider v2 and a 1.7m span twin boom own design pusher.
We have problem with the X8's and the RvJet with loss of altitude in turns. I had quite a bit of correspondence with Paul Riseborough one of the developers, to try get to the bottom of this and we fixed a number of issues but our problem never went away.
The graph attached from a flight with the Easyglider illustrates what I believe to be the problem, what I can't understand is the seemingly conflicting information the graph shows
It seems to me that the plane is [i]climbing[/i] according to the increasing altitude and reducing altitude error but it is [i]pitching down[/i] according to it's attitude.
Am I seeing things, reading the graph wrong or is there really a problem here? The graphs from the other aircraft are show a similar pattern.
The Easyglider being a very forgiving airframe seems to handle this issue OK whereas the X8 particularly struggles to the point of either exceeding "VNE" or descending dangerously low.
Please can someone assist in getting to the bottom of this?
Tlog is here: https://dl.dropboxusercontent.com/u/21460892/2013-12-06%2010-40-15Easyglider.tlog
Droneshare log here: http://www.droneshare.com/view/d7tar4n