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View Full Version : A question about Aileron Trim



rick_475
02-04-2004, 11:57 PM
I was cruising at fast speed with a La-5 and the plane started to turn slightly on the right. I decided to adjust "Left Aileron Trim" to stabilize the plane. This is what I noticed : When I adjust "Right Aileron Trim" and "Left Aileron Trim" the plane starts to turn right.

Why the plane doesn't turn left when I add some "Left Aileron Trim"? Do you have an explanation for this?

Thanks

rick_475
02-04-2004, 11:57 PM
I was cruising at fast speed with a La-5 and the plane started to turn slightly on the right. I decided to adjust "Left Aileron Trim" to stabilize the plane. This is what I noticed : When I adjust "Right Aileron Trim" and "Left Aileron Trim" the plane starts to turn right.

Why the plane doesn't turn left when I add some "Left Aileron Trim"? Do you have an explanation for this?

Thanks

michapma
02-05-2004, 01:27 AM
Concerning right and left aileron trim, check your assignments. Applying left aileron trim should have the effect of applying a small amount of left aileron and holding it, as you expect.

Concerning turning slightly at cruise, this is no job for aileron trim. The vertical stabilizer (tail fin) will cause various amounts of yaw at various airspeeds. The yaw generated results in a small imbalance of lift on the wings, so that one wing dips slightly. This is what you noticed. The best way to counter it is to offset the root of the problem, that is, the yaw and not the wing dip. If your wing is dipping to the right, apply some left rudder trim. If to the left, then right rudder trim.

I am not satisfied with most planes in FB that I can keep my wings level and my heading constant. It seems I can rarely find the trim setting for a cruise speed that allows this. Well, the pilot does have a job to do, after all. http://ubbxforums.ubi.com/infopop/emoticons/icon_smile.gif

Cheers,
Mike

http://www.baseclass.modulweb.dk/69giap/fileadmin/Image_Archive/badges/69giap_badge_chap.jpg (http://giap.webhop.info)

The ongoing IL-2 User's Guide (http://people.ee.ethz.ch/~chapman/il2guide/) | Forgotten Skies (http://www.forgottenskies.com/)

Fillmore
02-05-2004, 06:28 AM
Check your control settings. LA5 does not have aeleron trim, so if pushing that button does something it is set to something else.

michapma
02-05-2004, 07:26 AM
Heh, heh. I've flown the La-5F a fair amount recently, and didn't even notice. Aileron trim is generally only needed when you have combat damage.

Thanks Fillmore. http://ubbxforums.ubi.com/infopop/emoticons/icon_smile.gif

http://www.baseclass.modulweb.dk/69giap/fileadmin/Image_Archive/badges/69giap_badge_chap.jpg (http://giap.webhop.info)

The ongoing IL-2 User's Guide (http://people.ee.ethz.ch/~chapman/il2guide/) | Forgotten Skies (http://www.forgottenskies.com/)

salthill
02-05-2004, 09:33 AM
hi,
is there a source for telling you what planes have trim and what trims are available (within FB of course, is it in the manual or readmes)

cheers

michapma
02-05-2004, 09:50 AM
It may be mentioned in the object viewer, I don't know. I actually don't know of any source describing this, I just find out as I fly. http://ubbxforums.ubi.com/infopop/emoticons/icon_frown.gif

In general, 190s and 109s don't have rudder or aileron trim. Pz-11s, I-16s and I-153s have no trim at all. Technically, these did have trim but it was preset on the ground and not adjustable in flight. Apparently Lavochkins have no aileron trim.

http://www.baseclass.modulweb.dk/69giap/fileadmin/Image_Archive/badges/69giap_badge_chap.jpg (http://giap.webhop.info)

The ongoing IL-2 User's Guide (http://people.ee.ethz.ch/~chapman/il2guide/) | Forgotten Skies (http://www.forgottenskies.com/)

gates123
02-05-2004, 01:35 PM
Try using rudder trim to fix the slow roll in the russian a/c

http://gr.fipu.krasnoyarsk.edu/camms/archive/ww2_fighters/0112/pics/0112_2_1.jpg
Did anyone see that or was it just me?