Uh-HUH.

I wanna SEE you roll that Cessna.

I'm not talking about flunking flight exams here, I know all about two-minute turns and a hundred other Full-scale things an RC pilot wouldn't bother with. They want you to add rudder to pass your test. That means nothing here.

YAW is a BIG deal, and the DRAG from Yaw is IMMENSE, it matters. I can slow a plane down from a rocket to a crawl just from crabbing it on approach. It doesn't fly well that way, every other aspect of that plane's flight is FIGHTING the Yaw. Throw that into a roll and you've got a problem, and a very inefficient roll. It slows the roll and makes it sloppy.

Jim