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I thought the Formula18 had a set, specific
guide for hull/attachments no matter who made it.



Nope, that would be the F16 class.

On these 16 footers (or really 5.00 mtr. = 16.4 feet) the poles must be 3500 or shorter; irrespectly of the where the mainbeam or bows are.

Wouter

Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands