ORIGINAL: Dave McDonald
Ditto on what AKFireMedic said.
knife edge has serious pitch and roll coupling. Since harriers and knife edge are some of the fundamental 3D manuevers, the UCD 60 is a handicapped 3D plane right from the start.
there are two UCD60s at my club in England.
Mine (120AX) has a very small amount of K/E mixing and my friends (OS90FX) has none.
They K/E and K/E loop all day with no issues. I have put myself in the target zone by stating this on RCU before but anyone
with large coupling problems with their UCD does not have it set up correctly.