Simviation Forums

Ok,So i start a flight from Manchester
with learjet 45 to Logan int.After i get
up to about 8,000 feet my plane wants
to go upwards slightly or it wants to nosedive.


HEEEEEEEEEEEELLLLLLLLLLLLLPPP!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Aren't planes supposed to go up and down?  lol

In all seriousness, I'd try either adjusting the aircraft trim, or re-calibrating your joystick (if present).

I've always noticed that FS planes tend to oscillate up and down, no matter what you are flying.  It tends to happen more the higher you go in the atmosphere, so it must be something to do with either pressure or temperature, or a combination of both.

I first noticed this when I would fly extended flights across the Atlantic and up the sim rate to 16x to get through those long bits.  Almost any aircraft (other than large passenger jets) seems to have this quirk, so don't be alarmed.  Just let it happen smoothly, and you won't change more than about 200 ft either way.

[quote]I've always noticed that FS planes tend to oscillate up and down, no matter what you are flying.

The Learjet tends to go up and down as well as the other jets in FS2002. It takes concentration and very fine adjustments in the trim in order to "hit" the exact configuration and yet after some time (minutes) you may need to trim again (wind, pressure conditions). This attitude appears in all airplanes but much less in a Cessna or a Baron.
On the other hand the autothrottle in FS2002 is a bit slow in response which causes the effect untill it balances at a specific configuration. Are you using time warp? If you set it to 16x the autopilot will never be able to balance. Even if you start the time warp from a balanced position the deviation will increase up to an annoying point. I have experienced the last one with all the jets in FS2002.

Good points, all. I do exactly what Simone says to counteract the problem.

The effect is sometimes more noticeable with add-on planes, where the flight dynamics are perhaps not as refined as the could be. I had a 767 that would 'porpoise'as soon as you got over around FL250, whereas of course the real thing doesn't do it. A different 767 model didn't do it, and the difference appeared to be in how the dynamics were configured. Small adjustments in the aeroplane geometry and engine thrust helped to minimise the problem.