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View Full Version : How do Trims work?



Marw73
01-07-2008, 08:37 PM
I see all the elevator, aileron, and rudder trims settings listed (ctrl+arrow, shift+arrow), but none do anything when I try them in flight...
What's their purpose and how I can see them in action, actually doing something?

BTW - I play with torque and gyro effects on, so I guess trims should allow me 'realistically' minimize their effects (?). I use keybord and need to constantly adjust the direction of flight, etc.
However, none of the shift or ctrl combiations in arrows seem to do anything...
Please advise.

berg417448
01-07-2008, 08:40 PM
What plane are you flying? Some planes like the I-16 did not have pilot adjustable trim.

Other planes like the Bf-109 have pilot adjustable elevator trim but not rudder or aileron.

Other planes can adjust all 3.

Waldo.Pepper
01-07-2008, 09:01 PM
What's their purpose and how I can see them in action, actually doing something?

Choose a plane that has them on all three control surfaces.

Park it on the runway.
Go external.
Mash the keys and observe the results.

Skycat_2
01-07-2008, 10:15 PM
Pick a US fighter. Most or all of them have trim for all three axis. The P-47, P-51 and Wildcat/Hellcat do for certain.

Other planes may only have one or two trimmable surfaces. Elevator trim is fairly universal. Rudder and aeleron trim, on the other hand, were apparently luxuries that the military powers of Europe could not afford.

CloCloZ
01-08-2008, 07:01 AM
Originally posted by Marw73:
I see all the elevator, aileron, and rudder trims settings listed (ctrl+arrow, shift+arrow), but none do anything when I try them in flight...
What's their purpose and how I can see them in action, actually doing something?


I found that the main source of confusion comes from not knowing which trims are available for the chosen airplane, coupled with the lack of on-screen feedback when activated.
You can use "IL-2 Functions" (download it from
http://www.mission4today.com/index.php?name=Downloads&file=details&id=1740 (http://www.mission4today.com/index.php?name=Downloads&file=details&id=1740)))
to check which trims are available for any plane (the Excel sheet is updated to v4.07).

The best way I've found to to be sure of trim activation is to use Virtual Cockpit
http://www.mission4today.com/index.php?name=Downloads&file=details&id=371
that clearly indicates which trims are active and their setting, but you should be able to notice that just observing plane behaviour when flying straight in clear conditions.

Marw73
01-21-2008, 09:21 PM
Great, thanks, this is making more sense to me now.

As for virtual cockpit.exe - is that for 1946 or older versions?

Lurch1962
01-21-2008, 09:45 PM
It often takes several presses of the key(s) to induce a noticeable effect, especially for rudder trim, it seems. Currently I have only elevator trim mapped to a slider on my CH stick. So for rudder trim I have one of the stick's buttons send a group of 4 or 5 key sequences for each time I press it. Otherwise I always have to mash the button a bunch of times. http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gif

Never heard of this "Virtual Cockpit" before... what does it do? Anyone??

Cajun76
01-21-2008, 09:57 PM
http://forums.ubi.com/eve/forums/a/tpc/f/23110283/m/207...791086426#5791086426 (http://forums.ubi.com/eve/forums/a/tpc/f/23110283/m/2071054426?r=5791086426#5791086426)