i see the same porpoising. for me, it seems to stop when i disengage the a/p. beautiful plane, tho.chris

I use the King Air 350 airfile and it works fine. No problems with autopilot.

The only thing I see for most Convair aircraft is to select "Convair" for manufacturer, and put "None" in the model spot. You are then called a generic "Convair" - as close as I could get...Hope this helps,-- Tom GibsonCalifornia Classic Propliners: http://members.aol.com/tgfltsim/index.htmlAlcoHauler Locomotive Page: http://members.aol.com/alcohauler/home/alcohaul.htmlFreeflight Design Shop: http://www.freeflightdesign.com/ San Diego Model RR Museum: http://www.sdmodelrailroadm.com/Drop by! ___x_x_(")_x_x___