Sir - It seems as if some of our cousins in the aerospace composites business have been re-inventing the wheel ("Thrust team finds key to cheaper patterns, Flight International, 20 December, 1995-2 January, 1996).
Medium-density fibreboard has been used for some years as an effective pattern-making material.
TREVORSTARR
Composites Processing
Crewkerne, UK
Source: Flight International