Mechanical and order rigidity of nematic elastomers

We calculate the ratio of moduli for extension parallel and perpendicular t o tile director of nematic elastomers. Elastomers in practice are not ideal nematics with a jump from a finite to zero-order parameter with increasing temperature. Some classes behave as if under effective external fields. Th ese are really internal in origin and leave the system subcritical (still w ith jumps) or supercritical. We give expressions for general non-ideality, and memory of formation conditions; along with its translation into values of the "fields''. For the case of supercritical fields, we find that tile m odulus ratio deviates more from unity, in accord with experiment, than in t he subcritical case.