That's right Eric - Think of the fuselage/rudder as a lever moving the
glider about the center of the yaw axis. The farther away the rudder is
from the center of that axis the farther it must move to have the correct
effect. Only by increasing the size can we make it move laterally far and
fast (but that creates a weight problem). A longer fuselage reduces the
"force" needed - but the tail it needs to travel laterally farther faster
to have the appropriate effect. Thus, the 1-34 is very stable in yaw - but
it really doesn't have adequate yaw response when you step on the
rudder. Consider for a minute the size of the rudder on the Genisis
2: It's downright tiny (maybe 25% the size of the 1-34's) - but it is so
close to the center of yaw axis that it is more than adequate - and much,
much, more responsive than the 1-34. In general, the farther the rudder
hinge line is from the wing spar - the bigger the rudder needs to be for
proper yaw response.

Roy