One of the big differences between designs with conventional materials and a sandwich composite solution is the small weight penalty for increased thickness .
HISTORY
Composite panels , especially fibreglass , for caravans have their roots in Europe , where the emphasis is on lightweight caravanning . The benefits eventually became clear to Australian manufacturers .
The sandwich panel technique came into wide use during the 20th century , largely in response to the demands of the aerospace industry to optimise strength-toweight ratios .
A CNC router is used to cut the required holes in sandwich panels for hatches and air-cons , etc .
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