BaddJet Home

Aftermarket sponsons

IJSBA · Hull and handling

Aftermarket sponsons

Legal in every class except Vintage Ski Limited. Count and drop are the class discriminators.

Universal: max 91.45cm (36.00 in) each, 100.00mm (3.94 in) lateral protrusion, 63.5mm (2.50 in) vertical channel, minimum 6mm (0.24 in) thickness if aftermarket, radiused leading edges, never attached to a planing surface.

Where it stands, class by class

20 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 legal 1 class

NO AFTERMARKET SPONSONS ARE PERMITTED. OEM sponsons may be removed. · VSKL.2.3

Legal, within limits 1 class

Up to FOUR sponsons. Max 38.00mm below the hull side/bottom intersection.

Legal, within limits 1 class

Up to FOUR. Single- or two-sponson configuration per side limited to 1,524mm.

  • Sport Spec · none - this document uses ALL-CAPS section headings, not numbered rules

Legal, within limits 1 class

Max TWO, 63.5mm drop per SKM.2.4, BUT the class also says Kawasaki hulls follow Ski Stock rules and Yamaha hulls follow Four Stroke Ski Lites rules. Unresolved conflict.

Legal, within limits 1 class

Max TWO. Max 63.5mm drop - increased from Stock.

Legal, within limits 1 class

Up to FOUR: two traditional bladed plus two Tubbie-type convex appendages. Max 63.5mm drop.

Aftermarket sponsons: 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 IJSBA class · where the rulebooks differ · signed checks on parts the shop sells.

Hull and handling · two and four stroke · legal outright in 19 of 20

Start
BaddJet Class Legality