HN39 ...
It turns out that my first calculation was too simplistic and it has therefore been deleted. The FAR Part 25 regulations specify an ultimate load corresponding to 24*1.5=36 g. The rudder and supporting hinge brackets must be able to support an inertia ultimate load acting parallel to the hinge line of 24*1.5=36 times the weight of the rudder. Since Arm 36g is at an angle of 38 degrees to the rudder hinge line, 120 000 N in the direction of that arm corresponds to 94 561 N along the rudder hingeline, and hence to a rudder mass of 268 kg.
HN39 Thanks for that! The Arm
was given a "descriptive" name, and the reason for that lay in the minutiae of the regulations.
Talk about left turns, right turns, red herrings and tangents - we've had the lot!
mm43