A helicopter support vessel is the right answer when an owner wants helicopter capability on the programme but doesn't want, or can't justify, building a 90m+ mothership with a certified hangar. The support vessel carries the aircraft, fuels it, services it, hangars it overnight, and crews it. The mothership stays cleaner, stays smaller, and stays focused on guest accommodation.
Why a helicopter usually lives off the mothership
Putting a helicopter on a yacht permanently is harder than it looks. The constraints stack up:
- A certified helideck under MCA LY3 Annex 6 requires structural reinforcement, drainage to a dedicated tank, foam fire-fighting, deck markings, perimeter netting, and an operating envelope that's compatible with the parent's pitch and roll
- A hangar adds 6 to 8m of deck length, plus access doors, plus the fuel system
- Aviation fuel storage requires its own bunded tank, separate venting, and a full crash and emergency response setup
- An aviation engineer, a pilot, and (for commercial operation) a fire team add to the crew complement
- Most flag states require the helicopter and the deck to be operated and certified separately
A helicopter support vessel solves all of that by taking it off the mothership. The mothership keeps a touch-and-go pad if the brief calls for it, and the support vessel does everything else.
Touch-and-go versus full hangar
The two operating models, simplified:
Touch-and-go on the mothership, full operations on the support vessel: The aircraft lands on the mothership for guest pickups and drop-offs, never shuts down, and returns to the support vessel for fuel, hangar, and maintenance. This is the most common pattern for 60 to 80m motherships paired with a 50 to 75m support vessel.
Full operations on the support vessel only: The aircraft never lands on the mothership. Guests come to the support vessel by chase boat or tender for pickup. This pattern works well when the mothership is too small for any deck operations or where the owner wants the helicopter out of sight.
The first pattern is more flexible. The second is more secure and more conservative on insurance terms. Most major underwriters now distinguish between the two operating models and price accordingly.
Hangar and deck spec
A working helicopter support vessel in the 50 to 80m bracket typically carries:
- A certified helideck sized for the largest aircraft in the programme (an AW109 needs a 13 to 15m D-value; an AW139 or H145 needs 18 to 22m)
- A hangar with deck-to-roof clearance of 4 to 5m and width to clear rotor blades when stowed
- A telescopic or hinged hangar door with sea-state lockout protocols
- Aviation fuel storage of 5,000 to 15,000 litres (Jet A-1) in a dedicated bunded tank
- Foam, dry powder, and BA fire-fighting set up as a permanent installation
- Refueling skid with metered dispensing, water-detection filter, and grounding
- Tie-down points to a 1m grid for blade-folded storage and tow tractor manoeuvring
For a smaller support vessel (40 to 50m), it is feasible to omit the hangar and operate as a fuel-and-deck platform with the helicopter exposed on deck overnight under a custom cover. This is common in Mediterranean and Caribbean programmes; less common in expedition operation where a hangar is non-negotiable.
Crew and operating envelope
A helicopter support vessel adds significant crew load. The aviation contingent typically includes:
- Pilot, with a backup pilot for any operation that runs more than 90 minutes flight time per day
- Helicopter engineer (HEMS-rated for medevac work, A-rated for the airframe in service)
- Helicopter landing officer (HLO) and helicopter deck assistant (HDA) for deck operations
- Refueller, often the HDA on smaller programmes
That's three to five additional crew on top of the marine complement. The support vessel itself usually carries 12 to 25 crew depending on size, with the helicopter team accommodated on a dedicated mess and roster.
Class-wise, most helicopter support vessels are built or converted to a commercial classification with helicopter notation (Lloyd's HEL or DNV HELDK), inspected annually by an Aviation Inspection Body, and operated under the flag state's aviation regulations as well as the marine ones. There is no unified framework; each flag state interprets the rules differently. Cayman Islands and the Marshall Islands tend to be the practical choice for owner-operated programmes; the Red Ensign group for commercial charter.
Builders and platforms
The major hulls used as helicopter support vessels:
- Damen Yachting Yacht Support range (4508 to 7512), with the larger hulls offering full hangar capability
- Astilleros Armon Shadowcat monohulls and catamarans (Hodor, Shadowolf), purpose-built around helicopter and toy carriage
- Lurssen and Feadship full-custom at the top of the market, where the support vessel is itself a 70m+ build
- Conversions of offshore supply vessels (Edmiston/Shadow Marine model) for owners prioritising deck space over finish
The 75m Damen YS 7512 is currently the largest support vessel built by Damen Yachting and includes a helicopter hangar as part of its 1,900GT envelope (SuperYacht Times reference). For smaller programmes, the YS 5009 (55m) is the working benchmark.
Cost framework
Realistic cost ranges:
- New-build helicopter support vessel, 50 to 60m: €30m to €55m
- New-build, 70 to 90m: €55m to €130m
- OSV conversion to helicopter support: €12m to €30m all-in
- Helicopter (AW109 to AW169 bracket): €4m to €12m new
- Aviation operating cost (pilot, engineer, fuel, maintenance, insurance): €600,000 to €1.4m per year
The aviation operating cost is the line owners most often underestimate. A serious helicopter operation runs to the seven-figure mark per year before the airframe insurance is paid. Read shadow yachts for the broader support-vessel cost framework, and our take on chase boats versus shadow vessels for how the smaller-craft decision interacts.
Talk to us if you're scoping a helicopter support brief; the lead time on a purpose-built hull is now 30 to 42 months at the major yards.