For safety, efficiency, comfort of draw, and accuracy it's a good rule to always make the bow as long as use conditions allow. Longer bows, all else equal, are far less likely to break. They have lower string angles, for lower stack/higher energy storage. The mass disadvantages of length can be neutralized by reducing the degree of bend in the grip and near-grip areas. This reduced bend means lower hysteresis just where most of the bow's energy is stored. Arguments and comments welcomed. -- Tim Baker