Yeah Jeff,
it just hit me, mach crit. I couldn't remember what the proper name was, too early or too old.
I doubt they are seeing that!
I wrote a little addition to my post, too nose heavy on swept wing edf's and they nose over when going really fast, usually in a turn. The tail stalls and most R/C guys don't know what happened. I heard a guy call it "hyper stall"! I crack up at these R/C terms.
Chris...