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The Duramold Process
After extensive tests to determine the best glues and construction techniques for working with wood on such a massive scale, a process known as Duramold was adapted for the H-4. Duramold utilized many thin layers of wood glued together and then cured under high heat and pressure. It produced a strong, smooth skin that could be formed into tight, compound curves.
This Duramold test sample was made during the H-4's construction. Note the many layers of birch and how tightly curved the material can be formed. |