1,694 multihull fitments documented

Two engines. Two propellers. Twice the reason to get it right.

Name: Bruntons Australia — Queenscliff Workshop
Address: Shed 6, 10 Queenscliff Harbour, Queenscliff, VIC, 3225, AU
Telephone: 0418 327 403
Price range: $$$

Nobody in Australia has propped more production catamarans: every gain — fuel, revs, drag — doubles across twin drivetrains, and every mismatch does too. Handed pairs, saildrive splines and twin sizing symmetry are daily work here.

Why cats are different

The three rules of multihull props

Handed pairs, always

Left-hand and right-hand rotation, matched, so thrust and prop walk are symmetric — the difference between spinning a cat in its own length and embarrassing yourself at the fuel dock.

Saildrive spline fitment

Most modern cats run Volvo or Yanmar saildrives — spline, anode and clearance details differ from shaft boats and we confirm them against the drive model, not the brochure.

Light-air motor-sailing is the use case

Cats motor-sail long miles on one or both engines. Self-pitching Autoprops keep whichever engine is running properly loaded — the biggest documented gains in the fleet.

The multihull cut of the database — fitments by builder

Measured

Bruntons fitment database — 1,694 documented multihull installations

The library

Documented catamaran models

Which cat do you run?

Start the Builder with your model — twin fitments pre-fill as a handed pair and an engineer verifies both sides.

Build my prop spec 0418 327 403

Name	Documented fitments
Leopard	263
Lagoon	250
Fountaine Pajot	197
CNB	96
Balance	81
St Francis	60
Broadblue	54
Catana	50
Sunreef	43
Knysna	40