UIM · Hull and handling
Only the GP1 classes have a trim tab article at all.
24 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules. 8 of them borrow another class’s rules and are marked below; for those, the link to the parent class is read from the categories table rather than stated in the rulebook. 8 publish no rule for this part and name no parent to borrow one from, and are grouped together at the end.
Not permitted, not listed in the rules 5 classes
Not listed in this class. Illegal under the class's own stock clause.
Not permitted, not listed in the rules 3 classes
Only the manual trim system substitution.
Not permitted, not listed in the rules 2 classes
No trim article.
Not permitted, not listed in the rules 1 class
Only nozzle-trim systems.
Legal, with conditions 5 classes
Permitted. May not exceed the width of the planing surface or extend more than 100 mm rearward beyond the transom. All edges radiused. No fins, rudders or skegs.
No rule published for this class 8 classes
No component rules are published for this class and no single parent class is named, so this part cannot be answered for it. That is an absence in the rulebook, not a permission.
Aftermarket hull trim tabs: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.
Every UIM class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.
Hull and handling · two and four stroke · legal in 5 of 16 answered, all with conditions