UIM · Hull and handling
Only the GP1 classes have a trim tab article at all.
24 classes, grouped by the 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 publish no component rules of their own and are marked below; for those, the link to the parent class is read from the categories table rather than stated in the rulebook.
Not permitted, not listed in the rules Our reading, not a rule we can quote at you. This class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list.
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.
Governed by the parent 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.
Legal, within limits 3 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. · 501.04.02.05
Legal, within limits 2 classes
Same limits. · 502.04.02-05
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 · signed checks on parts the shop sells.
Hull and handling · two and four stroke · legal outright in 5 of 24