FU3 will always have a special place in my heart (for obvious reasons), but I don't think that I will be installing it again. The flight models of the Cessna 172 and Beechcraft Baron in FSX are good enough for my style of flying, and the same can be said of the surprisingly stable HS748 from Rick Piper. "Throttle only" flights in MSFS in the past have been a rather unsatisfying "bob up and down" affair (and that still seems to happen to a certain extent with the default King Air 350), but those planes mentioned above are very well behaved these days.

"Throttle only" flights in MSFS in the past have been a rather unsatisfying "bob up and down" affair (and that still seems to happen to a certain extent with the default King Air 350), but those planes mentioned above are very well behaved these days.

While I'll never understand why you insist on not trimming for the various phases of flight there are a few things to consider. The "bobbing up and down" may be a realistic modeling of variations in throttle input while flying with a high angle of attack. The phugoid oscillation will tend to be more pronounced when the AoA is high. Secondly, different aircraft have different thrust lines. When the engines are positioned way above or way below the center of gravity a change in power will cause an instantaneous and transient change in attitude. Thus, the plane will nose up or nose down as the power changes and oscillate for some time until it returns to the stable attitude set by the trim.A plane that doesn't phugoid (oscillate / bob) when you horse around isn't necessarily well-behaved -- it may be unrealistically "stable" in the wrong sense. Since you're an FU III old-timer you know what I mean -- real aircraft / realistically modeled sim aircraft are not riding on rails. So what is a truly stable aircraft? It's one that returns to what it was doing (some time) after you stop changing the inputs (power, control surfaces). Provided it was flying at 90 knots before you started yanking the stick around / throttling up / down it should return to flying at 90 knots when you let go. That is, while a change in power will decide whether it ends up climbing or sinking it should do so at a speed of 90 knots when the bobbing subsides. That's a well-behaved aircraft :(

Trimming increases the speed of the plane, and forces me to think about more things than I want to. With my style of flying, I set the trim and flaps at the start, and then the only aspect of control that I have to think about for the entire flight is the throttle input. The low speed of the plane (even a big turboprop like the HS748) gives me more time to enjoy the scenery, and also confidence that I am in complete control. I know that this baffles most of you, but that's the way I like to do things. I'm not interested in recreating flights exactly as they are done in the real world. I just want to be able to control the planes at low speeds (and that requires a half decent physics engine), interact with ATC, and enjoy looking at impressive scenery and detailed airports.As for the "bobbing up and down", I am not referring to the immediate reaction of the plane when I increase or decrease the power. I am referring to the fact that the King Air 350 doesn't seem to have a stable middle ground when hand flying a final approach. It seems to either want to climb, or else drop out of the sky! Maybe that's realistic? Maybe the plane isn't particularly suited to hand flying? I have no idea, but it doesn't really matter. I can live with the other three :(