RE: What exponentials do you usually use on big Extras?
There will be an article in 3D magazine upcoming article on the JR Challenge. My dual rate and expos along with all the other pilots will be listed, I'm told. This will be an excellent reference for you.
I cannot remember what I am using, as the Tx is still with the plane, and will be driven back over the next several weeks.
I think I'm running about 20 percent expo now on low rates, and about 30 percent on high rates. On 3D rate, I'm at least 60 percent expo.