They also tend to stress smaller modrocs (sigh..). The NAR was slow to hop on the bigger higher faster bandwagon in high-powered rocketry (often abbreviated HPR), as much of its membership uses small black-powder fired motors instead of the higher impulse composite fuels typical in HPR's.
NAR contests are large, and have a huge competitor base stemming from all demographic groups and often include a lot of real masters. NAR rockets tend to be smaller than HPR-class rockets; the ever-popular Estes enterrage of rockets and motors are examples of typical NAR sanctioned rockets.