Boat Slide Glossary: Yacht and Pontoon Slide Terms

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You’re reading a yacht slide quote on the flybridge and it mentions a GA drawing, a lifting bridle and RapidFlate. Or you’re on a pontoon forum and someone says your slide needs a Halkey Roberts adapter. Slide makers, dealers and charter brokers use their own words. This boat slide glossary explains them in one plain sentence each, so you can read any spec sheet or quote with confidence.

In short: the words that matter most are rail-to-waterline (the drop that sizes a yacht slide), rider limit (200 lb on pontoon slides), QuickShip versus custom (stock or made to order), and the valve type (Halkey Roberts on many pontoon slides). The rest of the terms are grouped below by sizing, slide types, construction, inflation, rigging, buying and safety.

Sizing and fit

• Rail-to-waterline: the vertical distance from the top of the rail where a slide hangs down to the water surface, the number yacht slide makers size from.
• Drop: another word for the rail-to-waterline height a slide has to cover, as in “a 4 to 6.5 m drop.”
• Railing height: Yachtbeach’s term for the same measurement, listed in centimetres for each model (for example, 270 to 350 cm for the Magic Yachtslide 4.6).
• Loaded measurement: measuring the drop with fuel, water, gear and people aboard, because a loaded boat sits lower than an empty one at the dock.
• Launch point: the spot on deck where riders start and the slide is attached.
• Rail clearance: the gap between a slide and the yacht’s rail; FunAir says its slides sit 10 to 15 cm above the rails.
• Rider limit: the maximum weight per rider the maker allows, 200 lb on every pontoon slide we track.
• Landing zone: the area of water where riders come off the slide, which must be deep and clear of swimmers, toys and lines.
• Minimum water depth: the depth a maker requires under the slide’s end, such as 5 ft for the RAVE Pontoon Slide.

Types of slides

• Boat slide: any slide that runs from a boat into the water, inflatable or fixed.
• Pontoon slide: an inflatable slide made to strap onto a pontoon boat’s deck, usually 8 to 9 ft of sliding surface.
• Pontoon waterfall slide: WOW Sports’ name for its inflatable pontoon slide, also used loosely for pontoon slides in general.
• Dock slide: a slide set on the end of a dock that runs into a lake.
• Floating water slide: a slide built on its own float that sits in the water rather than on a boat or dock.
• Yacht slide: a large inflatable slide that hangs from a yacht’s rail or deck into the sea, sized to the drop.
• Superyacht slide: a yacht slide for the biggest yachts, often custom built for drops over 9.5 m.
• Over-the-rail slide: a slide that drapes over the yacht’s rail from a deck, the common yacht layout; FunAir describes its Hanger Extreme this way.
• Hanger slide: FunAir’s family of slides that hang from the rail, from the Hanger Mini (2 to 3.5 m) to the Hanger Extreme (7 to 9.5 m).
• Self-lifting slide: a custom FunAir slide for drops over 10 m, aimed at busy charter yachts.
• Riser: FunAir’s custom slide that stands on its own for drops over 9.5 m.
• Freestanding slide: a slide that isn’t hung from the yacht but anchored in the water, like FunAir’s 5 m tall Apex Extreme.
• Bow, stern and curved slides: custom FunAir slides shaped to launch from the front, the back or around the yacht’s lines.
• Flume slide: a fully custom slide design from FunAir, built for a particular yacht.
• Multi-deck slide: a slide that starts from a high deck such as a helideck; a 41 ft S-shaped slide was built for a 70 m yacht in 2013.
• Top deck: the raised upper deck on a double-decker pontoon from which a fixed slide starts.
• Double-decker pontoon: a pontoon boat with an upper deck, often with a factory slide, such as Bennington’s Top Deck models.
• Fiberglass waterslide: a rigid slide built into a boat’s upper deck, found on double-decker pontoons and houseboats.
• Houseboat slide: a fixed fiberglass slide from a houseboat’s upper deck; a 2014 article listed 10 ft and 12 ft models.
• Water toys: the yachting term for slides, sea pools, paddle boards, Seabobs and other fun gear carried aboard.

Construction and materials

• 1000-denier PVC: a heavy PVC-coated fabric with a thick base weave, used on the Airhead Spillway and on FunAir slides.
• Denier: a measure of fibre thickness in the base fabric, where a higher number means a heavier yarn.
• Drop-stitch: two layers of fabric joined by thousands of threads so a high-pressure chamber stays flat and stiff, used in Yachtbeach slides.
• Sealed-air: a slide that is inflated once and sealed instead of being kept up by a blower; FreeStyle calls its Cruiser the first sealed-air yacht slide.
• Hot-air welded seams: seams fused with heat rather than glued, as FunAir uses on its slides.
• FR and UV ratings: fabric treated to resist fire (FR) and sun damage (UV), listed on FunAir’s material specs.
• 316 stainless steel: a marine grade of stainless used for D-rings and hardware because it resists salt corrosion.
• D-ring: a D-shaped metal ring welded or sewn onto a slide for tie-down and rigging lines.
• No-jump net: netting at the top of a yacht slide that stops riders jumping off the side.
• Vinyl arms: raised sides on FunAir slides that keep riders centred and, the maker says, prevent slide burns.
• Side safety chambers: inflated rails along a pontoon slide that keep riders on the sliding surface, as on the Spillway.
• Water distribution system: built-in hoses or sprayers that keep a slide wet and fast, standard on FunAir yacht slides.
• Marine-X PVC: Superyacht Tenders & Toys’ high-tensile PVC, which it says makes its slides about 30 kg lighter on average.

Inflation

• Halkey Roberts valve: a common high-pressure inflation valve on towables and pontoon slides, needing a matching pump adapter.
• High-pressure valve: any valve made to hold air at the firmer pressures slides use, such as the Spillway’s Halkey Roberts type.
• Pressure-release valve: a valve that lets out excess air so a chamber can’t be overfilled, fitted on Yachtbeach slides and some pumps.
• 12V inflator: an electric pump that runs off a boat or car battery, included with the RAVE Pontoon Slide.
• RapidFlate: the blower FunAir supplies with its yacht slides, when appropriate, alongside an electric pump.
• Valve wrench: a tool for removing and tightening inflation valves when replacing one.

Rigging and attachment

• Anchor points: strong fixing points on the boat where a slide is tied; FunAir says proper anchor points and rigging are essential.
• Structural points: parts of the boat built to take load, as opposed to a handrail meant only to stop people leaning.
• Through-bolted: fastened with bolts that pass right through a deck or frame, usually with a backing plate, rather than screwed into the surface.
• Straps: the webbing that holds a pontoon slide to the boat’s sides.
• Lifting bridle: a set of straps that lets a crane or davit lift a large slide into place, fitted by Superyacht Tenders & Toys.
• Davit: a small crane on a yacht, normally used for tenders, that can also lift a big slide.
• Leg support: a support under a long yacht slide; FreeStyle generally recommends one above 5 m.
• Flat entry and 45-degree entry: the two ways a superyacht slide can start, level with the deck or angled down.

Buying and ordering

• QuickShip: FunAir’s in-stock slides, such as the FunSize and Hanger Mini, which can ship within days.
• Custom slide: a slide designed and built for one yacht; FunAir quotes a standard 35-day lead time for custom inflatables.
• Quote only: a product sold without a public price, where the maker or dealer prices it for your boat.
• General Arrangement drawing (GA): the deck plans of a yacht, which FunAir’s engineers use to size a slide.
• Slide Measuring Guide: FunAir’s published instructions for taking the measurements it needs.
• 3D CAD fit model: a computer model of the slide on your yacht that FunAir makes before building.
• Factory option: a slide fitted by the boat builder when the boat is made, like Bennington’s Top Deck slide.

Safety

• Spotter: an adult whose only job is to watch the water and the landing zone while the slide is in use.
• Diver-down flag: a flag that tells other boats people are in the water nearby.
• Carbon monoxide (CO): an odourless gas in engine exhaust; the US Coast Guard warns never to hang on the back deck or swim platform while engines run.
• Coast Guard-approved life jacket: a life jacket that meets US carriage rules, sized for its wearer and suited to the activity.
• Wind limit and age limit: two figures no boat slide maker publishes, so any number you see is not from a maker.

See the terms in real products

A 12V inflator, a Halkey Roberts valve and a 200 lb rider limit, all in two boxes. Prices seen on Amazon in October 2026: RAVE about $320, Airhead pump about $72.

Glossary questions

What’s the difference between drop and slide length?

The drop is the height the slide covers; the slide length is the length of the sliding surface. The Yachtbeach 4.6, for example, fits a 270 to 350 cm railing with a 484 cm slide.

Is drop-stitch the same as sealed-air?

No. Drop-stitch is a way of building a flat, stiff chamber; sealed-air means the slide is inflated and sealed rather than kept up by a running blower.

What does QuickShip mean?

It’s FunAir’s term for stock slides that can ship within days, instead of being built to order.

Where do I find my GA drawings?

Your captain, management company or the yacht’s builder will have them. If not, FunAir and other makers can size from simple measurements; see how to measure rail-to-waterline.

More: the boat slide FAQ, the setup and safety hub, Fit & Sizing and the best yacht slides.