David Paul wrote on Mar 12^th, 2011 at 8:44pm:

Make sure that the aircraft config line "empty_weight_CG_position     = -8.5, 0, 0 "  was edited correctly.  Note the Minus sign in front of the 8.5 there.   I edited my -100/F and -200/F files today, and accidentally left out the minus sign for that line.  That gave me the negative MAC reading that the OP seems to be getting.

In the readme.txt it says:

"empty_weight_CG_position     = -6, 0, 0"

I'm having problems with pitching up at takeoff. I set the trim as per the Trim Chart but have to fight to keep the nose under 20 degrees. Maybe this is my problem?