Other than the 25% rule on the sports and the + or - rule on the lenght and beam on the scales. I have not seen found or seen anything in writing for the IMPBA. Now namba and the apba look at couple other measurements on the scale side. I am not sure on the sport side of things.Ive looked on the IMPBA site and all i see for scale,sport 40 and sport 20 boats,is width and depth restrictions. Is there a length restriction in any of the orgs? thanks Mikey
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