Trim in US Aircraft

[pauldy]

Yah, i 've been into the F-15 & A-10 for quite some time now but i have this rather noobish curiosity about their trim.

 

First in the F-15,

 

i was wondering why wont it stay level.

Unless i've engaged the autopilot the plane's bound to pitch up continuously even though i'm maintaining a constant throttle setting.

 

Also during landings, the "auto trim" of the F-15 want's to reduce the descent rate by itself or rather keeps itself level.. this happens when i commence the flare and reduce the throttles to idle..

 

If i don't apply a bit of forward stick, the plane would continue to level until falling off.. at stalling/minimum speed warning.

 

Anyways i wonder if the real F-15 also behaves like this.

 

 

As for the A-10,

 

Why is this one so hard to keep perfectly level? (or at least flying in a more level path with little variance in altitude.)

 

When i change the A-10's trim it will like go up quite high, trim down and it will go so nose down.

 

Sorry if i cant express it properly, anyways the A-10 seems "jumpy" when being trimmed. Unless i engage the Autopilot, the plane is hard to keep perfectly level..

 

 

I'm just wondering after all or maybe i'm missing something.. :)

[Kuky]

You can try to vary your speed a little to match trim... I know it should be other way round but if trim is not fine enough you can still change your speed a few knots and it'll keep your altitude better.

[Laud]

Or try assigning rotators instead of knobs to set trim. By setting a curve in the controller-options in LO you can define the feedback intensity. Maybe... just an idea...

[pauldy]

Speed variation does work on the A-10, but not in the F-15.

 

It will continue to pitch up even though i'm at low throttle settings.

 

Maybe it's the "aerodynamics"? :unsure:

 

I don't think it's my joystick either since all other planes like the can remain in neutral pitch.