1.) How do I solve the problem of "porpoising" (incessant up and down pitching), that seems to infect most of the aircraft I have downloaded from the Internet. Of course heavy dependence on the autopilot is a solution for some pilots, but the hallmark of a well balanced aircraft is that it can be trimmed up for climb, cruise, or descent and, once trimmed, will maintain the desired attitude with the pilot's "hands off".
2.) Can anyone recommend a twin turboprop with accurate flight dynamics, one that I can trim up and fly by hand? Thanx for any and all help.