A hollow thin walled shell with integral internal baffles is formed by a multilayer coating process. A series of mandrels is designed to be assembled to form the outer surface of the desired shell. The mandrel surfaces hidden during assembly include the areas intended to form the internal baffles. The...http://www.google.com.au/patents/US5932360?utm_source=gb-gplus-sharePatent US5932360 - Hollow shell with internal baffle
