Not permitted, not listed in the rules 17 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
IHRA · Hull and handling
Flotation foam removal
IHRA answers this part for 29 of its classes. 8 of those answers are permissions, with or without limits attached, and 21 are not. 21 are inferred from how the class is written rather than quoted from a rule naming this part.
Where it stands, class by class
29 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.
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.
No rule, this is an open class Our reading, not a rule we can quote at you. This class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms.
Legal, within limits 2 classes
Flotation foam only. The inner hull liner or deck must NOT be modified to facilitate removal.
- Ski 1100 Modified · R.6.4
- Ski 1500 Modified · Q.6.4
Legal, within limits 1 class
The inner hull liner or deck cannot be modified to facilitate foam removal. · BB.10.4
Legal, within limits 1 class
Foam between hull and deck layers cannot be removed. · T.6.3
Legal, within limits 1 class
The inner hull liner or deck CAN be modified to facilitate foam removal - opposite of Ski Modified. · S.6.3
Legal, within limits 1 class
Only engine-compartment flotation foam. · K.8.4
Legal, within limits 1 class
Must provide sufficient flotation. · V.9.5
Legal, within limits 1 class
Sufficient flotation must be maintained. · X.7.5
No rule, this is an open class 3 classes
The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.
- Drag, 2 Stroke Unlimited · DD.12
- Drag, Stand Up Unlimited · DD.10
- Drag, Unlimited · DD.6
No rule, this is an open class 1 class
No restriction in section CC, and CC.1 permits any modification it does not restrict.
- Freestyle · CC
Flotation foam removal: 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 IHRA class · where the rulebooks differ · signed checks on parts the shop sells.
Hull and handling · two and four stroke · legal outright in 8 of 29