Liferafts Compared: Ocean Safety, Viking and RFD

This is an independent, objective comparison — we have no partner among liferaft brands. Built from published maker specifications and the governing standards, not a hands-on deployment test.

All three of these makers build certified, standards-compliant rafts, so the real engineering decision is which standard and grade you deploy, and how the double-floor, ballast, canopy and gas systems are actually built — not the badge. For a Melges 40 the governing document is the World Sailing Offshore Special Regulations, which for Category 0–2 accepts a SOLAS LSA-code raft or an ISO 9650-1:2005 Part I Type I Group A raft with the correct pack. Getting the standard and the housing right — and understanding where the three makers genuinely diverge in construction — matters far more than which name is on the valise. See our liferaft primer for deployment and boarding.

At a glance

What the standard actually specifies

Before the brands, the standard — because it defines the physical raft. World Sailing OSR 4.20 does not care about the badge; it requires, for offshore categories, either a SOLAS LSA-code raft or an ISO 9650-1:2005 Part I Type I Group A raft with a Pack 1 (>24 hour) — or a Pack 2 (<24 hour) plus a grab bag holding equivalent food and water. Legacy ISAF and ORC rafts are grandfathered only until end of serviceable life. That single clause rules out most of the "coastal" market and tells you exactly which sub-type to buy.

Within ISO 9650-1, the Group letter is where the survival capability lives, and the differences are measurable rather than marketing:

• Floor. Group A mandates an insulating double floor — a second inflatable skin (or foam-and-film sandwich) that lifts the occupants off the water and breaks the conductive path to a sea that may be 12–15°C. Group B and the coastal ISO 9650-2 run a single skin with no thermal barrier. In cold water this is the difference between managing core temperature and losing it.
• Canopy erection. Group A erects its canopy automatically on inflation; Group B requires manual erection — a task you are attempting soaked, adrenalised and possibly injured. An automatic canopy is a genuine survival feature, not a convenience.
• Exposure envelope. Group A is type-tested and packed for −15°C to +65°C; Group B is validated only to 0°C. The gas charge, valve behaviour and fabric plasticity are all proven at the lower bound.
• Signalling and lighting. Group A carries a 4.3 cd exterior light against roughly 0.75 cd for Group B — a real detectability margin for a night search.

On the cradle a Group A and a Group B raft can look identical: same yellow buoyancy tube, same canister. The capability is not the same, and the OSR only accepts Group A for a reason.

Buoyancy tube and hull construction

This is where the three makers genuinely diverge, and it drives longevity, service cost and cold-weather reliability.

Ocean Safety's Ocean ISO uses a polyurethane-nylon laminate for the buoyancy tubes and hull — a coated-fabric approach where a PU film is bonded to a nylon substrate. PU laminates are light, weld cleanly (fewer, better seams), and resist UV and abrasion well; the trade-off historically is long-term flex-fatigue at the folds versus the older elastomer coatings. The tube is a double buoyancy chamber — two independently-inflated rings so a single puncture cannot sink the raft — finished in dayglo yellow for visibility.

Viking's RescYou family is built from natural rubber with acrylic/silicone-coated nylon. Rubber-based coatings are the traditional survival-craft material: heavier per square metre than PU laminate, but with excellent low-temperature flexibility and a long, well-understood service life — the reason rubber-coated fabrics still dominate SOLAS construction. Critically, Viking vacuum-packs the folded raft. Removing air from the pack slows oxidation of the fabric and degradation of the pyrotechnics between services, which is what underpins the confident three-year interval; it also compresses the pack for stowage.

Survitec's yacht rafts (the Leisure ISO line that now carries the RFD/Survitec lineage) use polyurethane-coated fabric with a double inflatable floor and a canopy built to SOLAS construction standards even on the ISO raft. The stand-out here is the parent platform: the RFD Surviva is a core SOLAS commercial raft — PU-coated textile, fully-enclosed double-skinned canopy, fully insulated floor, high-volume water pockets — engineering that filters down into the yacht products. If you want the deepest merchant-marine survival pedigree behind a yacht raft, this is the lineage that has it.

The engineering read: PU laminate (Ocean Safety, Survitec yacht) is the lighter, modern route and the right instinct on a weight-critical sportsboat; rubber-coated fabric (Viking) trades mass for proven cold-flex and, with vacuum packing, storage longevity. All three deliver a twin-chamber tube; none is "better" in the abstract — the choice is a weight-versus-longevity trade the campaign makes deliberately.

Ballast, stability and self-righting

A liferaft capsized in a breaking sea is worse than no raft, so ballast volume and righting behaviour are load-bearing specs — and they are quantified.

ISO 9650-1 sets a minimum ballast volume of 220 litres. Makers routinely exceed it: Ocean Safety publishes 4–5 × 75 L pockets — roughly 300–375 litres depending on capacity, which is a meaningful margin over the floor and drives faster fill and better resistance to capsize as the raft inflates. Viking's Pro carries "large ballast bags"; Survitec quotes "high-volume water pockets." These pockets are the single most important stability element because they work before anyone is aboard — the raft must resist inversion in the seconds between inflation and boarding, when it is empty and most vulnerable.

The self-righting question is where SOLAS pedigree shows. SOLAS commercial rafts (the RFD Surviva platform) carry a righting strap on the hull underside and are drop-, overload- and side-impact-tested to right or be righted after an inverted deployment. ISO 9650 yacht rafts rely primarily on ballast geometry and, in a knockdown, on a single crew member righting the raft manually from the water using the strap. For a Melges 40, the honest position is that ballast volume and the crew's drilled righting technique matter more than a self-righting claim you are unlikely to need — but it is a genuine axis on which the Survitec/RFD lineage leads.

Gas system and deployment

Every raft here fires on a CO₂ charge with a small nitrogen component — the nitrogen acts as an anti-freeze agent so the cylinder still delivers full pressure at the −15°C Group A bound, where pure CO₂ would be prone to freezing at the valve. Deployment is by the painter line: pull it to full extension and the pull fires the cylinder, inflating both tube chambers and the floor and erecting the canopy in seconds.

The critical stowage decision is the hydrostatic release unit (HRU). On a canister-and-cradle installation, a Hammar-type HRU (the H20 is the reference device) releases the canister at 1.5–4 m depth if the boat sinks before the crew can launch it manually; the painter then pays out, comes tight and fires the raft, which floats free. On an open-transom sportsboat that goes down fast, an HRU-equipped canister is what turns "we couldn't reach it" into a deployed raft. A valise has no HRU and must be hand-launched — which is exactly why it is only defensible in a dry, instantly-reachable locker.

Housing, weight and stowage on a Melges 40

The pressure vessel and pack are identical between formats; the housing changes exposure rating, weight and deployment speed.

A GRP canister is a UV- and weather-sealed rigid case for a transom cradle or rail mount — ready to launch, HRU-capable, and the right answer where the raft lives on deck. A valise is a coated-fabric soft pack: a few kilos lighter and easier to strike below or hand between crew, but with no weather rating and no float-free capability, so it demands a dedicated dry locker.

Published masses set the weight budget. Ocean Safety's Ocean ISO runs roughly 28 kg for a 4-person valise and about 33 kg for the 4-person canister, rising to the mid-50s of kilograms for the 10-person canister; Viking's and Survitec's ISO-class rafts sit in comparable territory for the same capacity and grade. The SOLAS Surviva, by contrast, is markedly heavier for the same headcount — it is engineered for davit launch and long endurance, and on a sportsboat you would be carrying survival margin you will never deploy. On a Melges 40 this is a deck-layout problem as much as a purchase: the cradle must hold the canister securely against slamming and green water yet release it instantly, and the mass has to be somewhere the boat can carry it without wrecking trim. Plan the stowage before you buy, and check it against your safety audit.

Equipment pack and the grab-bag strategy

The OSR gives you two compliant routes, and the smart one is often the second. A Pack 1 (>24 hour) raft carries the full offshore inventory — additional water, rations, more comprehensive signalling and repair kit — and is heavier and bulkier. A Pack 2 (<24 hour) raft is pared back but, combined with a properly built grab bag holding equivalent food and water, is equally compliant and usually the better systems answer: it keeps consumables and your EPIRB, PLBs, handheld VHF, water and personal medications in a bag you control, inspect and update on your own schedule, rather than sealed inside a raft you open once every three years. Whichever route you take, read the actual packed inventory for the grade — do not assume — and confirm it against your passage profile and crew number.

Servicing — the factor that should decide it

For a race campaign this is where the real differences sit, because a raft is only as good as its last service. Modern ISO 9650 canister rafts are certified to a nominal three-year interval; Viking's vacuum-packed construction is explicitly designed to protect the fabric and pyrotechnics across that span. Legacy ISAF-era rafts must be serviced annually — they were not built to the current material and packing specification, and the OSR reflects that. SOLAS commercial rafts (the Surviva platform) are annual by regulation, with a five-year hydrostatic test of the inflation cylinder on top — real recurring cost and downtime that only makes sense if your programme mandates SOLAS.

The practical intelligence is network reachability. Survitec/RFD runs the deepest, most global commercial service footprint by a wide margin — a genuine advantage if you campaign internationally and need an approved station in an unfamiliar port. Viking's network is likewise large and long-established across both commercial and yacht work. Ocean Safety is well supported across the yacht and leisure market. Before committing to any brand, confirm where the raft gets serviced near your home port and your campaign venues, what the turnaround is, and what it costs — that answer should carry as much weight as the specification, because a raft out of service is not a raft.

The step-up principle still outranks the brand

One rule overrides the whole comparison: you step up into the raft, never down. Stay with the boat as long as it is more survivable than the raft; board only from a hull that is genuinely going down. No raft from any maker is a better place to be than a floating Melges 40. The engineering above tells you which raft to buy; drilling the launch, the HRU behaviour and the boarding with your crew tells you whether it will save anyone. See liferafts explained.

Our take

With no partner here: on core compliance and build quality, all three are sound. The engineering separates as follows. Ocean Safety's Ocean ISO is a light, well-specified PU-nylon Group A raft with class-leading published ballast volume (4–5 × 75 L) and strong yacht-market service support — an easy default for a European-based programme. Viking's RescYou / RescYou Pro trades a little mass for rubber-coated cold-flex and, uniquely, vacuum packing that genuinely underpins the three-year interval, backed by a large dual commercial/yacht network. Survitec/RFD carries the deepest SOLAS survival pedigree — the Surviva platform's insulated floor, double-skinned canopy and self-righting engineering — and by far the broadest global service footprint, which matters most if you campaign internationally or a rule forces SOLAS.

For a Melges 40 Grand Prix campaign, work backwards from the OSR and the map: buy an ISO 9650-1 Type 1 Group A raft (not SOLAS unless mandated — the weight is dead margin), in a canister on a cradle with an HRU, paired with a Pack 2 plus a maintained grab bag, from the maker whose approved service station is genuinely reachable at your home port and your regatta venues.

Who each is best for

• Ocean Safety (Ocean ISO) — a light, high-ballast PU-nylon Group A raft with strong yacht-market service support; the pragmatic default for weight-critical sportsboats.
• Viking (RescYou / Pro) — those valuing rubber-coated cold-flex, vacuum-pack longevity behind the three-year interval, and a large dual commercial/yacht network.
• Survitec / RFD — campaigns wanting the deepest SOLAS survival engineering and the broadest global service footprint, or where a rule mandates SOLAS.

The takeaway

The raft is defined by the standard, not the badge. For offshore racing that means ISO 9650-1 Type 1 Group A — insulating double floor, automatic canopy, −15°C envelope, ballast well over the 220 L minimum — deployed in the housing your deck demands with an HRU if it lives on deck. Choose the tube laminate as a deliberate weight-versus-longevity trade, close any pack gaps with a grab bag, and let the reachability and cost of an approved service station near your venues carry as much weight as any figure. Then treat it as a system: service on schedule, stow it to launch fast, and drill the step-up boarding. It is a core item on the safety audit and in race yacht safety systems.

Our pick: for a Melges 40 campaign, an ISO 9650-1 Type 1 Group A raft in a canister on an HRU-equipped cradle with a Pack 2 + grab bag is the correct configuration regardless of maker — the OSR asks for exactly this and SOLAS mass is wasted on a sportsboat. Among the three, Ocean Safety leads on light weight and published ballast volume, Viking on vacuum-pack longevity behind the three-year interval, and Survitec/RFD on SOLAS pedigree and global service reach. Let the grade the OSR requires, the format your transom can stow, and the approved service agent nearest your venues make the final call.