Boats from trimarane It's a trade-off between the stability of flat-bottomed models and the handling of keels, and their key feature is three longitudinal cylinders (or keels) that form a V-shaped bottom profile, which provides better wave-based stability without sacrificing load capacity, and if you're looking for a boat to fish on windy lakes or to hunt in coastal areas, a trimaran bottom might be the best solution.
Unlike classic flat-bottomed inflatable boats, trimaran models are less prone to drift and better able to keep their course even in lateral winds. Honda Honwave T40 or Zodiac Cadet 310 With this bottom, you need to be more careful when mooring to steep shores, and in this article, we'll look at who will fit the trimaran bottom, how to use it properly and what to look for when buying.
What is a trimaran bottom and how does it work
The term trimaran comes from sailing, which is what we call three-hulled vessels. trimarane It implies the presence of three longitudinal elements of rigidity:
- 🛶 Two side cylinders (on the sides), acting as stabilizers.
- 🏗️ The central keel (or balloon) that gives the boat a V-shaped profile.
- 🔄 Intermediate ribs of stiffness (in some models), connecting the cylinders.
This design allows the boat to crash into the wave rather than plane across the surface, as flat-bottoms do. For example, when moving against a wave 0.5-0.7 m high, a boat with a trimaran bottom will be less likely to "jump" and passengers will experience less discomfort from impacts on the water. However, in calm water, the difference with a flat-bottom is minimal, and the advantages of a trimaran bottom are manifested only at speeds above 20-25 km / h or on excitement.
It's important to understand that the trimaran bottom is not a universal solution, it's more efficient than the classic keel on small and medium waves, but it's inferior to deep-keel boats (for example, the keel is not a universal solution). Bombard Commando C4) in high excitement. These boats also require more powerful engines to go into plane due to increased water resistance.
Advantages and Disadvantages of Trimaran Bottom
To objectively assess the trimaran bottom, compare it with alternative designs: flat bottom boats and boats with a rigid keel.
| Parameter | Trimaran bottom | Flathead | Hard keel. |
|---|---|---|---|
| Resilience on the wave | ⭐⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐⭐ |
| Managing cornering | ⭐⭐⭐⭐ | ⭐⭐ | ⭐⭐⭐⭐⭐ |
| Speed of exit to plane | Medium | Low. | High. |
| Difficulty mooring | Medium | Low. | High. |
| Price. | Above average | Low. | High. |
The main advantages of the trimaran bottom:
- 🌊 Better permeability in shallow water compared to keel boats (e.g., Yamaha FX31 It can go where it is. Zodiac Pro 500 It'll run aground.
- 🎯 Control accuracy at medium speeds – the boat is less blown by the wind.
- 🛠️ It is easier to repair than a hard keel (no risk of fiberglass damage).
The disadvantages that often keep silent sellers:
- ⚠️ Increased fuel consumption 10-15% due to greater water resistance.
- 🔧 It is more difficult to fold and transport because of the additional cylinders.
- 💰 Higher cost compared to flatbeds of the same size.
⚠️ Attention: Boats with trimaran bottom are strongly recommended not to be used on high-speed rivers. The central cylinder can catch on the stones, which will lead to overturning or rupture of PVC.
What tasks is suitable trimaranean bottom
Trimaran boats are versatile, but there are areas where they perform best:
- Fishing on large lakes and reservoirs. For example, on Rybinsk Reservoir or Lake LadogaWhen the wave is 0.5-1 m, the trimaran bottom will provide comfort even in lateral winds. The boat will not fall under gusts like a flat-bottom.
- Hunting in coastal areas. Due to the fine draft (15-20 cm), you can approach the reed thickets without risking a run aground, while the stability allows you to shoot from the side without the risk of overturning.
- Family vacation on the water. Trimaran boats are wider than flat-bottoms (for example, Bic 240 It is 1.5 m wide compared to 1.2 m in analogues, which makes them more convenient for the transportation of children or cargo.
And here's where the trimaran bottom loses:
- 🚤 Racing or speeding. Keel boats accelerate faster and more easily go to the plane.
- 🏞️ Fast-flowing river rafting. The central cylinder creates additional resistance, making maneuvering more difficult.
- 💼 Commercial use It's more about the load capacity than the driving performance.
If you choose a boat for fishing on the current, pay attention to the models with the trimarane (for example, Quicksilver 340 AirDeckThis will transform the boat under different conditions: set the bottom for the wave or remove it for rafting on the river.
Top 5 boats with trimarannaya bottom in 2026
There are dozens of models on the market, but we've selected some that have earned positive feedback from both anglers and hunters, all of which are GIMS certified and suitable for registration.
| Model | Length, m | Max, engine power, hp. | Load capacity, kg | Features |
|---|---|---|---|---|
| Honda Honwave T40 | 3.5 | 20 | 565 | Aluminum floor, removable bottom, weight 58 kg |
| Zodiac Cadet 310 | 3.1 | 15 | 500 | PVC 1100 dTech, reinforced seams, completed with oars |
| Bombard AX330 | 3.3 | 25 | 600 | Three layers of PVC, reinforced transom, suitable for motors up to 25 hp. |
| Yamaha FX31 | 3.1 | 15 | 450 | Completed with a pump and bag, weighing 38 kg |
| Bic 240 Sport | 2.4 | 5 | 320 | Lightweight and compact, perfect for one person |
When choosing, pay attention to:
- 🔹 PVC material. Optimal - 1100 dTech (like the Zodiac or BombardCheap 750 dTech PVC models will last no more than 3-4 seasons.
- 🔹 The transom design. For motors over 15 hp, a reinforced transom with an aluminum plate is needed.
- 🔹 Package. The basic kit should have oars, a pump and a repair kit, and if they're not, that's a bargain.
⚠️ Attention: Models less than 3 m long (e.g., Bic 240) are not subject to registration in GIMS, but are not intended for access to large bodies of water; they can only be used on closed bodies of water (ponds, small lakes) without a motor or with a motor up to 5 hp.
How to properly operate a boat with a trimaran bottom
The trimaran bottom requires more careful care than the flat bottom.
☑️ Checklist before the launch
Features of management:
- 🔄 On the turns of a boat with a trimaran bottom less inclinedBut if you're in a sharp maneuver, you can slip to the side, and to avoid that, you can turn the steering wheel smoothly, especially at speeds above 30 km/h.
- 🌬️ When side winds keep the course at a small angle (5-10) to the wind - this compensates for the demolition.
- 🚤 When you go to the plane, let the engine gain speed to 3/4 of maximum, and then smoothly raise the bow of the boat. The trimaran bottom requires 10-15% more power for planing than the flat-bottom.
Care for the trimaran bottom:
- 🧼 After each exit, wash the boat with fresh water, paying attention to the joints of the cylinders - sand and salt accumulate there.
- 🔧 Once a season, check the pressure in the central cylinder: it should be 0.02-0.03 bar higher than in the side.
- ☀️ Keep the boat disassembled in a cool place. Direct sunlight destroys PVC in 2-3 seasons.
What happens if you pump the cylinders?
Pressure exceeding 0.05 bar from normal leads to deformation of the seams. In the worst case, the balloon can burst on the go, especially when heated in the sun. The optimal pressure for most models is 0.25 bar (indicated in the boat data sheet).
Trimaran bottom vs keel: which is better for fishing
This question is often asked by fishermen who choose between the two. Bombard Commando (keel) and Honda Honwave Let's compare them by the key criteria:
| Criteria | Trimaran bottom | Keel bottom |
|---|---|---|
| Speed on planing | Up to 40 km / h (with a 20 hp engine) | Up to 50 km / h (with a 20 hp engine) |
| Fuel consumption per 10 km | 2.5–3 l | 2.3 l |
| Resilience in trolling | ⭐⭐⭐⭐ ( less swinging) | ⭐⭐⭐ ( It can fall off with a side wave. |
| Shallow water permeability | 15–20 cm | 25-30 cm |
| Difficulty of transportation | Medium (requires more space) | High (a hard keel takes up a lot of space) |
Critical: if you are fishing on the current (for example, on the Volga or the Don), the keel boat will be more predictable to control, because it better "holds" for water.
Conclusion:
- 🎣 For lake-trolling or anchor-fishing Trimaran is better.
- 🏞️ For riverside or long-distance - Keel.
Trimaran bottom is justified if you fish in water bodies with a wave of up to 1 m and value stability more than speed. For extreme conditions (high current, large waves), choose a keel boat.
Self-made trimaranium bottom: is it real?
Many owners of flat-bottom boats (for example, The frigate M-320) thinking about modifying the bottom. It's theoretically possible, but there are some nuances in practice:
What you need:
- 🛠️ Additional cylinders (can be cut from an old boat or bought separately)
- 🧵 Pvc glue (e.g., PVC glue) Bostik 2402 or Polychem K-361).
- 📏 The slab for marking (drawing can be found on the forums, for example, FishHunting).
Step by step:
- Blow the boat and clean the bottom of dirt and grease (use)
acetoneorwhite-spirit). - Try on cylinders, mark the attachment points with a marker, the central cylinder should be strictly in the center, retreating 10-15 cm from the transom.
- Apply glue on both surfaces, wait 5-7 minutes (the time of "open exposure" is indicated in the instructions for the glue) and connect the parts.
- Roll the stitches with roller and leave under the press for 24 hours.
⚠️ Attention: A homemade trimaran bottom not certified by GIMSThis means that the boat will not be registered, and when tested on water, a fine of up to 2,000 rubles (Article 11.8 of the Administrative Code of the Russian Federation) is possible, and unprofessional gluing can lead to depressurization of seams on the move.
If you still decide to modify, test the boat first without a motor, and then with a minimum power engine (up to 5 hp). Remember: even factory trimaran boats pass crash tests, and homemade designs can behave unpredictable on the wave.
FAQ: Frequent questions about trimaran bottom boats
Can I install a trimaran bottom on any PVC boat?
Theoretically, yes, but in practice, this is only feasible for boats from 3 m long. On shorter models (2.5-2.8 m), the central cylinder will interfere with rowing and reduce the load capacity. It is also important that the material of the PVC boat is compatible with glue (for example, for PVC 1100 dTech you need a special glue, not a universal one).
Which motor is better for a boat with a trimaran bottom: two-stroke or four-stroke?
Four-stroke motors (e.g., Suzuki DF9.9 or Honda BF10) is preferable for three reasons:
- Less noise is important for fishing.
- Fuel consumption is 20-30% lower than that of two-strokes.
- Environmental: There is no need to mix oil with gasoline.
Two-stroke motors (e.g., Mercury 9.9) Cheaper and lighter, which is important for short hikes. If your budget is limited, choose a two-stroke with a direct injection system (e.g., a direct injection system). Yamaha 15 F) - they are less noisy.
How long does the trimarane bottom last?
The service life depends on the material and operating conditions:
- PVC 1100 dTech: 7-10 seasons with proper care.
- PVC 750 dTech: 3-5 seasons (sews wear out faster).
- Aluminum or composite inserts (in models) Honda Honwave): up to 15 years of age but require corrosion-resistant treatment.
To extend the service life:
- Keep the boat in a case that protects against UV rays.
- After each exit, wash the bottom of the sand and silt (they act as an abrasive).
- Once a season, treat the seams with sealant (for example, Sikaflex-291).
Can I use a boat with a trimaran bottom in winter?
Yes, but with reservations:
- ❄️ PVC becomes brittle at temperatures below -10 C. Do not fold the boat in the cold - this will lead to microcracks.
- 🛷 For winter fishing, choose models with a reinforced bottom (for example, Bombard AX330) as ice can damage cylinders.
- 🔥 When using gas heaters (e.g., solex) keep them at least 1 m from PVC to avoid melting.
The best winter modifications:
- Honda Honwave T38 - has a removable aluminum floor, which can be insulated with foam.
- Zodiac Pro 420 The reinforced cylinders can withstand the load of ice.
Do I need to register a boat with a trimaran bottom in GIMS?
Yeah, if:
- The length of the boat exceeds 2.5 m and engine power more than 5 hp
- The boat is used on navigable water bodies (rivers, large lakes).
For registration you will need:
- Passport of the boat (with indication of the trimaran bottom as a design feature).
- Receipt of payment of the state duty (2 000 rubles in 2026).
- Contract of sale (if the boat used).
Exception: boats up to 3 m long with an engine up to 10 hp can be registered in a simplified manner (through the portal of the State Services).