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Phinisi Design

Phinisi Design:
Choices That Drive Yield

Cabin count, dive deck, engine sizing and structural standards — each phinisi design decision translated into cost and charter yield, with every bracket flagged as an estimate.

Compare layouts by tier

Specify the Market
Before the Hull

The panrita lopi carries the design in his head — no drawings, no stability calculations. Many such hulls are sound, but none leave a record an insurer or surveyor can audit. At specification stage, every choice is a cost line.

Start with the decisions

Three Decisions Set in Timber

Once major structural choices are built in, they are not revisited. These three are made before the keel is laid — or paid for later.

Talk through your brief
01

Brief Before Boat

Fix the charter market, price point and waters first. A Komodo mid-range dive boat and a luxury Raja Ampat week-charter look different; conflating them buys an expensive compromise.

02

Class-Informed Structure

Scantlings reviewed to GL, Bureau Veritas or BKI produce the stability booklet a passenger certificate needs — and keep insurance off the top of the 1.5–4% premium range.

03

Timber in Writing

Ulin for keel and frames, bitti for curved planking, teak for decks — vertical-grain, 25 mm minimum. If a quote looks low, ask for the species list and provenance certificates.

Compare hull timbers

Cabin Layouts by Charter Tier

More cabins is not more revenue. Below USD 400 per person per night, berth count dominates; above it, ensuite ratio and privacy do. Partitioning is set at planking.

Open-Trip, 20–28 m
01

Open-Trip, 20–28 m

  • 6–10 berths, bunk or twin, shared heads acceptable.
  • Panrita lopi judgement, minimal class; 250–450 hp combined.
  • Turnkey USD 120k–400k (estimate).
See the build cost ladder
Charter-Grade, 28–38 m
02

Charter-Grade, 28–38 m

  • 4–6 ensuite cabins — guests at USD 600–800+ a day do not share bathrooms.
  • BKI survey during build; 500–850 hp combined (estimate).
  • Turnkey USD 400k–2M (estimate).
30 m line-item walkthrough
Ultra-Luxury, 40 m+
03

Ultra-Luxury, 40 m+

  • 4–8 large suites; up to 26 crew for 16 guests.
  • GL-equivalent scantlings, full class; 800 hp+ with redundant gensets.
  • Turnkey USD 3M–15M+ (estimate).
Interior fit-out costs

Systems That Earn — or Cost — Yield

On a dive liveaboard the dive deck is the product. Engines, rig and power are where under-specified builds lose charters.

30–50 cm above waterline

Dive Deck

A low stern deck makes entry easy and stays dry in a chop. At main-deck height (1.2 m+) divers climb ladders — and retrofitting is costly.

36–48 cylinders minimum

Tanks & Compressor

Twelve to sixteen guests diving three times a day need racks built into the structure and a separate, acoustically lined compressor room away from cabins.

35 m and above

Tender Garage & Crane

A stern garage protects the dive tender. The crane or davit must be engineered into the transom at design stage — or a stern cabin pays for it later.

Two masts, seven or eight sails

The Rig

Largely decorative on charter — Komodo routing means motoring dominates. Still a structural load path and a real maintenance cost. Budget for it.

~850 hp vs 250–350 hp cargo

Engines & Gensets

Yacht-spec phinisi need far more power than cargo hulls. Two mains sized to run alone; gensets often 60–80 kW continuous, mostly for air-conditioning.

Still rare commercially

Hybrid & Solar

Solar on deck shade structures covers low anchorage loads. Full hybrid drives face battery weight, wet-hull electrics and scarce technicians in Labuan Bajo and Sorong.

The Case for a Naval Architect

The Case for a Naval Architect

A lines plan agreed with the panrita lopi, a stability calculation for your load cases, fastener specs that prevent a USD 100,000 bolt surprise, and a document trail for BKI, insurers and resale.

Find the right architect

Design Questions

Short answers. Cost and power figures are industry-observed estimates unless marked.

Discuss your specification

Do I need a naval architect to build a phinisi?

For a budget open-trip boat under local standards, often not. For Western charter markets, international insurance, BKI class or a passenger certificate that needs a stability booklet, yes — the architect is how those documents get produced.

What is the best cabin layout for a 30m phinisi charter?

It depends on price point. Under USD 400 per person per night, maximise berths with five to eight cabins and shared facilities. At USD 600 and above, four to five large ensuite cabins command the premium rate.

What engines should a 35m phinisi charter boat carry?

Kasten puts yacht-spec phinisi at around 850 hp total, against 250–350 hp for cargo hulls. Two mains of roughly 250–425 hp each plus two independent generators is common at 30–38 m. Have an independent engineer model the power budget.

Is hybrid propulsion practical on a phinisi today?

Solar for low anchorage loads is practical and increasingly common. Full hybrid systems face battery weight against the stability curve, wet wooden-hull electrics and few qualified technicians. Ask an architect, not a panel supplier, for a lifecycle cost model.

Why does the rig matter if charter phinisi mostly motor?

It is a structural load path — mast partners, chainplates, keel reinforcement under the mast step — that must be designed in. Sail photos drive bookings. And a neglected masthead fitting is an expensive failure at sea.

How long from launch to the first charter?

Plan six to twelve months from hull launch to commercial operations for a properly documented new build. Stability review, BKI survey, passenger certificate and operating licence do not move at the yard's pace.

Continue the Build Path

Specifying a New Build?

Specifying a New Build?

Send your brief — market, waters, size. We reply on WhatsApp and can point you toward design professionals with phinisi experience, without a commitment.

Share your brief