If set up like MinnFlyer shows, the arms will be about 30 degrees forward of perpendicular as opposed to Mike Boyd's 60 degrees. The 30 degrees is more desirable as if you go much beyond this you will begin to limit the amount of throw available in one direction. In fact, the arm would actually go "over center" unless electronically limited. 45 degrees would be about the absolute limit for a servo that has a 90 degree total swing programed.