
Formosa Marine Tomahawk 550 Bowrider
18.0 ft aluminium Formosa Marine bowrider with outboard power — mid range pricing and a classic convertible bowrider layout.
- Length
- 18 ft (5.50 m)
- Drive
- Outboard
- Seats
- 9 people
US$39,000 - US$52,000 new
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Australia · since 1990s
Queensland plate alloy builder offering tough, custom-configured bowriders.
Formosa Marine has been building boats in Australia since 1990s, and like almost every long-lived boat builder the story starts small: a workshop, a handful of tradespeople, and local customers who wanted something better than what they could buy. Growth came from reputation rather than advertising — boats that survived hard local use, and owners who told their friends. As volumes grew, hand-built one-offs gave way to tooled production, and the company moved from making boats to engineering them: hull moulds or jigs, repeatable laminate or welding schedules, dealer support and a proper spare parts chain.
The move into bowriders was a natural one. Dealers kept asking for a boat that a family could grow into rather than out of, and the open bow answered it. Formosa Marine adapted its existing hulls to the open-bow format, then began designing specifically for it — walk-through screens, convertible cushions, under-seat lockers and transom lounges — and bowriders have been a core part of the range ever since.

Aluminium is the reason this brand exists in the form it does. Hulls are pressed or welded from marine-grade plate and sheet, which makes them light for their length, tough against rocks, ramps and beach landings, and cheap to repair when something does go wrong. A dented alloy hull is a panel job, not an insurance write-off. The trade-off is a firmer ride in short chop and a plainer interior than moulded fibreglass, which is exactly the compromise the target owner is happy to make.
Formosa Marine builds heavy plate aluminium boats in Queensland and specialises in configurations built to order rather than off a fixed price list. The Tomahawk range includes bowrider and sports layouts alongside the better-known offshore fishing models, and because the boats are plate rather than pressed alloy, the hulls are substantially thicker, heavier and quieter underway than volume alloy brands. That extra weight translates directly into ride quality: a Formosa bowrider stays planted in chop where a light pressed hull would slap and skip. Layouts are practical and generous, with wide side decks, deep cockpits, serious rails, big fuel capacity and storage sized for a full weekend rather than an afternoon. Buyers can specify seating, casting decks, live tanks, towers and electronics to suit whether the boat leans family or fishing. Formosa's strength is durability and customisation; the trade-off is a heavier tow and a higher price than pressed alloy rivals, along with longer build lead times.

Ask anyone at a boat ramp to name a Formosa Marine and you will hear Tomahawk 550 Bowrider, Tomahawk 620 Sports, Tomahawk 660. These are the boats that built the brand's reputation, and each one is documented on its own page on this site with specifications, layout notes, engine options and a real-world price guide.
The Formosa Marine Tomahawk 550 Bowrider is the model most buyers start with, and it sets the template for the rest of the range: open bow seating, a walk-through windscreen, a helm and companion seat amidships and a convertible transom lounge. Moving up the range adds beam and freeboard rather than just length, and beam is what you actually feel — a wider boat carries more people comfortably, stays flatter at rest and gives deeper lockers under the seats. Older generations of these same models remain popular on the used market, because the hulls change far more slowly than the upholstery and graphics do.
Formosa Marine is particularly recognised for Tomahawk 550 Bowrider, Tomahawk 620 Sports, Tomahawk 660 — and the full list of every model, series and range we have documented from this builder appears further down this page.

Formosa Marine sells mainly into Australia and New Zealand, where boating means beach launching, estuary and offshore fishing, ski runs on inland rivers, and long tows behind a family four-wheel drive. That market shapes the boats: high sides, self-draining decks, rugged fittings and trailers designed for salt water and steep ramps. Dealer coverage across the eastern states, South Australia and Western Australia is strong, and resale within Australia is consistently good because the brand is a known quantity at every ramp.
Being a Australia builder matters more than it sounds. Boats are designed around the water their designers use, so the Formosa Marine range reflects Australia conditions in freeboard, deadrise, cockpit drainage and seating priorities. If you boat somewhere similar, the boat will feel like it was designed for you — because it was.

Queensland plate alloy builder offering tough, custom-configured bowriders. Longevity is its own achievement in this industry: boat building is brutally cyclical, and a company trading since 1990s has survived multiple recessions, fuel shocks, ownership changes and complete generational shifts in what buyers want from a family boat. Surviving that long usually means the company was early to a construction method or a layout that the rest of the market later copied.
Plate alloy boats like these are popular with owners who launch off beaches or fish rocky, remote coastline.
The brand is known in the trade for Tomahawk 550 Bowrider and Tomahawk 620 Sports, and among owners for something less measurable: boats that get used every weekend instead of sitting on the driveway. That is the highest compliment a family bowrider can be paid.
Day to day, a Formosa Marine bowrider is judged on the small things. How quickly can two people get it off the trailer and back on again? Where do the wet towels, the ski rope and the cooler live? Is there shade at midday, and somewhere dry for phones and keys? Alloy decks hose out in seconds and dry fast, which matters when the boat goes back on the trailer wet. These boats are set up so a single adult can launch, retrieve and pack up without help, which in practice is the difference between a boat that gets used most weekends and one that stays in the driveway.
Running costs are modest for the class. Modern four-stroke outboards are frugal, quiet and simple to service, and a day of cruising with a couple of ski sets rarely troubles the fuel budget. Insurance, storage and trailer registration are the same as any comparable trailer boat, and because Formosa Marine is a recognised name, both insurers and finance companies value the boats without argument.
Mid-market pricing buys the sweet spot most families end up in: better upholstery foam, deeper lockers, more standard equipment and a more refined hull than entry-level boats, without the premium-brand asking price. Resale is usually steady because these boats are the most in-demand size and specification on the second-hand market.
Whatever you buy, inspect it the same way. Check the transom for flex with the drive or outboard lifted, tap the floor and stringers for softness, look hard at the bilge for staining and weeping, run the engine to temperature and confirm steering and trim work through their full travel. Upholstery seams and covers are the first things to fail on a boat stored outside, and they are also the most expensive cosmetic items to put right. On aluminium, check the welds along the chines and transom, and look for corrosion where dissimilar metals meet.
Finally, buy the layout rather than the badge. Sit in the bow, sit at the helm, sit on the transom lounge and imagine a full day aboard with your own family. Formosa Marine builds mid range aluminium bowriders with outboard power, and if that combination matches the water you use and the way you use it, this is a brand that will serve you for years and sell on well when you are ready for the next one.
Specifications, pricing guides and honest notes on each Formosa Marine bowrider.

18.0 ft aluminium Formosa Marine bowrider with outboard power — mid range pricing and a classic convertible bowrider layout.
US$39,000 - US$52,000 new

20.3 ft aluminium Formosa Marine bowrider with outboard power — mid range pricing and a classic convertible bowrider layout.
US$49,000 - US$65,000 new

21.7 ft aluminium Formosa Marine bowrider with outboard power — mid range pricing and a classic convertible bowrider layout.
US$55,000 - US$72,000 new
Featured Boat of the Week

This week we are putting the Bayliner Bayliner DX2000 in the spotlight, and it earns the spot. At 20 ft 2 in (6.16 m) long on a 8 ft (2.44 m) beam, this is a bowrider that reads the water well and still feels roomy enough for a full day out. A 20-foot deck-boat-width bowrider with outboard power and a huge social cockpit. Power comes from 115-150 hp mercury fourstroke outboard through a outboard package, and the fibreglass hull keeps the ride settled when the afternoon breeze puts a chop on the surface.
Seating is rated for 8 people, so there is space for family, friends, towels, eskies and the tow rope without anyone climbing over gear. Owners tend to buy it for family, water ski, leisure — which is exactly where it shines. Fuel is 30 us gal (114 l), and on the second-hand and new market you should expect to land somewhere around US$42,000 - US$58,000 new depending on hours, trailer and options.
Our full deep dive covers the layout in detail: bow lounge comfort, helm ergonomics, the rear entertaining area, storage that actually swallows a weekend, plus standard features, popular options and honest notes on where the boat compromises. If the Bayliner DX2000 is on your shortlist, start there — and check back next week, because the featured boat changes every week as we complete more full model reviews.
Featured Bowrider Article
Engines & Drives

Fuel is usually the biggest running cost of a bowrider, and it is also the one you control most directly. Two identical boats can differ by forty per cent in consumption depending on how they are propped, trimmed, loaded and driven. A 4.8-5.2 m bowrider with a 90-115 hp four-stroke uses roughly 10-18 litres per hour at cruise. A 5.5-6.2 m boat with 150-200 hp uses about 18-30 litres per hour. A 7 m-plus boat with 250-350 hp typically uses 30-55 litres per hour, and twin-engine boats more again. The useful measure is litres per nautical mile rather than per hour, because it accounts for speed. Most bowriders find their best efficiency just above planing speed, commonly in the 18-25 knot range at 3,500-4,000 rpm, where the hull is fully supported but not fighting drag. Below planing speed a hull drags a large wake behind it and burns fuel inefficiently. Once on the plane, consumption per mile drops sharply, then rises again as speed climbs because drag increases rapidly. Wide-open throttle can easily double consumption for a twenty per cent speed gain. Finding your boat's efficiency window is a fifteen-minute exercise. Run at increasing rpm, note speed and fuel flow, and calculate litres per mile…
Read the full article