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Aftermarket hull

IHRA · Hull and handling

Aftermarket hull

IHRA answers this part for 29 of its classes. 16 of those answers are permissions, with or without limits attached, and 13 are not. 12 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.

OEM part required 1 class

Must remain OEM. NO HULL SWAPPING. Both upper and lower hull must be Sea-Doo. · DD.11

Legal, within limits 2 classes

Aftermarket hulls may be attached to OEM top decks. Bow appendages must adhere to original specifications and be approved.

Legal, within limits 1 class

Interior structural reinforcement only. No external modifications. Must not alter external shape, running surface, strakes, chines, or ride plate interface. No material added to increase weight or alter weight distribution. · W.7.3

Legal, within limits 1 class

No hull splitting or lightening. FZR/FZS/GP/VXR/FX: modifications only forward of the intake grate. FZR/FZS cut-through repairs EXTERNAL ONLY, no fiberglass inside the hull. GP/VXR and FX may repair internally and externally. Hull must be sealed to top deck by rivets, bolts, adhesive or equivalent. · DD.1

Legal, within limits 1 class

Modifications forward of the intake grate, with cut-through repairs internal and external. Hulls may be SPLIT but may NOT be lightened. Plastics may be drilled for additional air, the centre wall may be removed where fitted, and the hull must be sealed using rivets, bolts, adhesive or an equivalent method. · DD.3

Legal, within limits 1 class

Yamaha SuperJet (2-stroke): Hull extensions allowed. No skegs, rudders, or fins. Must not exceed the planing surface width. Limits: max rear extension 100 mm. · M.6.2.1.1

Legal, within limits 1 class

Hull and top deck must remain OEM, however LIGHTENING IS PERMITTED. Plastics and top deck may be drilled for air. · DD.4

Legal, within limits 1 class

Aftermarket hulls permitted subject to Race Committee and IHRA approval. No fins, rudders, or skegs. Must not exceed the length or width of the upper deck bond flange by plumb bob. · K.8.1

Legal, within limits 1 class

Aftermarket hulls permitted with Race Committee and IHRA approval. · V.9.1

Legal, within limits 1 class

Must be a two-stroke runabout personal watercraft from any manufacturer, jet driven, with surface-drive propellers not permitted. · DD.12

Legal, within limits 1 class

Must be a stand-up PWC from any manufacturer, jet driven, with surface-drive propellers not permitted. · DD.10

Legal, within limits 1 class

Aftermarket hulls permitted if approved by the series organizer. Upper deck must resemble the OEM version as closely as possible. Silhouette test settles disputes. · X.7.1

Legal 1 class

Carbon-fiber and lightened hulls permitted. HULL SWAPS ALLOWED BETWEEN ANY MANUFACTURERS. · DD.5

No rule, this is an open class 1 class

No restriction in section CC, and CC.1 permits any modification it does not restrict.

Aftermarket hull: 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 16 of 29

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BaddJet Class Legality