even tent and awning material tends to be half the weight needed.
When I had the original 60cwt tarp made (and mudflap material)..it was by a company which existed in WWII.. and was the very heavy..treated canvas... the tarp weighed a ton!
and flaps were pretty stiff.. wish I had access to those Convoy templates...Phil may be correct there may have been two strips of stiffeners.
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I see you stand like greyhounds in the slips,
Straining upon the start. The game's afoot!
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