our source of data is first hand, personal flight testing, training new pilots, back to back flying and personal reference with other pilots plus related posts and threads on rcu and other forums, this is why my comments were as above. i must add that for us it was very disappointing to find so much negative feed back related to the 46 as we are so positive about the 60 and the 60 is by no means the be all and end all of 3d planes but it's one of the most enjoyable planes in our fleet and all ways draws a crowd, out of interest our s2g mambo , funtana and cap232 flies rings around both in every aspect but we still enjoy and fly our ucando often.