For all of you more advanced builders out there (or those beginning to attempt more advanced builds), a common problem is created auto-roll which comes from attaching fuselage pieces onto wing surfaces. It may be subtle or more noticeable, but it is definitely annoying. If you want to avoid this problem, make sure you heed the following:
This type of roll is caused by attaching a fuselage block to one wing, NUDGING the block into the desired position, then mirroring the block to the opposite wing. My theory is that, when nudging, then mirroring, the mirrored block will attach to a different attachment point, the closest point, which is different from the original side. That throws off the balance and induces the roll. My technique for avoiding this is to attach the block to one side, then mirror without nudging first. Once created, THEN nudge both blocks into position. Be sure to check (with Fine Tuner) the final position of the blocks to ensure they are exactly symmetrical. You can also manually place blocks on both sides without resorting to mirroring, though it is tedious to ensure both sides are placed in exactly the opposite positions using the same attach points, it's not too terribly difficult.
Should you be at the end of a very complex build and then discover this problem, you can try a couple of fixes: First, and most commonly seen, is to add a little weight to the "high side". This works, but causes the aircraft to veer on takeoff. A second, less commonly used technique is to add a few degrees of pitch on one elevator, which will cause an opposite roll moment to counteract the problem roll (this is known as "trimming" in real life--actual aircraft go through a "trimming" procedure post-maintenance being performed on flight control surfaces). I did this on my A-4K when I had induced a roll through my lack of understanding of the SP attach-nudge-mirror problem. The only problem with this is that the build is then trimmed up for a certain airspeed and altitude (low altitude and approx 480 mph for My A-4K--I figured the average SP player flies at full throttle and low altitude, so most players would not notice) but changes in those parameters will reintroduce a roll due to changing aerodynamic forces.
Of course, it is best to simply avoid the problem in the first place, so be sure to attach, mirror, THEN nudge or, alternatively, attach, attach, then nudge.
@Aerofy you’re welcome. Reading back over this older post, everything I’ve seen regarding autoroll has been because of asymmetric connections; however, since the advent of the Ortho and Attachment Mods being incorporated into the basic game, I’ve modified my building technique slightly to make extra certain this problem doesn’t occur. Now, when I build, I place the part on one side exactly where it should go. I then nudge the part a few clicks out of the way, disconnect all attachments, mirror the individual part to the opposite side and then reattach both parts symmetrically using the attachment tool. I then nudge both parts back to where they both should be, i.e., just nudge the parts in the opposite direction the same number of clicks as when I removed the first part. A little time consuming, but as you say, the only way to ensure you’ll avoid the autoroll problem.
I still dont understand much,But what I did was to disconnect a side of the aircraft then I mirror it,later on I manually attach both side to the center.But I found out that the position still dispair uneven like 0.00001.Now while thinking abt life I also thinking should I manually reattach and reposition both side,which is annoying my patience
This is very interesting method
Was having auto-roll problems, but your technique solved it. Thanks for this amazing post.
@RedRoosterII I don’t think so. It’s a pretty old post. I still build this way, though, as autoroll spoils great builds and I’m not taking any chances.
I did what you said to avoid this but it still happens?@ChiChiWerx
@ChocolateBar12 4:20
Thank you SO MUCH.
Yes!
@ColonelStriker