hamil,
I've about 4,000 hours on Chieftain (albiet not for a few years now). This trim setting would be similar on Navajo.
We would set trim 3 and a half revolutions back from full nose down position. If the pax we sitting more forward - another half a revolution aft and vice versa.
Used to work fine - those trim position indicators were usually pretty dodgy at the best of times.
