Miscellaneous notes from Charles H. Kaman - R&D Notes - Sound Quality and Stiffness Analysis

These are internal Ovation research and development documents dated September 1976 through August 1977, analyzing acoustic properties of guitar tops including stiffness measurements (FF, R, L, S, N, K) across multiple prototype guitars. The documents discuss the relationship between rim stiffness, longitudinal stiffness, and sound quality, concluding with target specifications for optimal guitar construction. Key targets identified are K: 65-70, R/L: 74, N: 40, and S: 45, with top weight below 155 grams for electric acoustic models.