STABLE TOURING KAYAKS

The purpose of this article is to explain the basic terms and facts related to Kayak Touring in order to enable the reader to make informed decisions when choosing a touring kayak.

GUIDE TO SENSIBLE KAYAK TOURING

Touring in the W720 Catamaran Kayak

Whether used as a solo or a tandem touring kayak, the patented Wavewalk 720 catamaran kayak is unique in what it offers, including unrivaled stability, enhanced safety, true comfort even for people with back problems, perfect tracking with no need for a rudder, highest versatility, utmost mobility (launch, go and beach anywhere), best portability (4 carry handles), and a huge storage space that redefines what’s possible in camping and expedition style touring.
The W700 is so stable that anyone can paddle it standing, even a 6’4″ tall, 300 lbs elderly guy – Watch this video »
One person can easily cartop a W700 on any roof rack – No kayak rack needed.
On top of this, the W700 is the only kayak that can be easily and effectively motorized, which adds another dimension to the safety, range of travel, and ease of use that it delivers.
And BTW, if you happen to like single-blade (“canoe”) paddles, the W700 tracks better and is more comfortable than any traditional canoe out there.

Two kayakers holding their Wavewalk 700 tandem kayak
Two Swedish kayakers holding their 12’10” long W720 tandem kayak. This photo shows how lightweight this kayak is (80 lbs), how spacious its cockpit is, how comfortable the longitudinal saddle seat is, and the huge on-board storage space available for camping gear, photography equipment, fishing tackle, etc.
Things To Know And Consider When Choosing A Touring Kayak

The purpose of this article is to explain the basic terms and facts related to Kayak Touring, in order to enable the reader to make informed decisions when choosing a touring kayak.

What is Kayak Touring?

Kayak Touring is a recreational paddling activity involving one or more kayakers going on medium to long range trips on freshwater and/or at sea. Typically, kayak touring does not include traveling in whitewater, fishing and hunting, but it is sometimes combined with going in rapids, waves and currents, camping, bird watching and wildlife photography.
A Touring Kayak is a kayak designed for one or two kayakers (tandem) going on kayak touring trips.
Compared to other kayak types, touring kayaks are designed for average to high speed.

1. A Brief History Of Kayak Touring

1.1    The Origins Of kayak Touring

Native peoples of the Arctic Circle used kayaks for touring expeditions for hundreds and possibly thousands of years before kayak touring became a recreational activity sometime around the beginning of the twentieth century. Their custom sit-in kayaks were hand crafted, and already had the basic design of modern days touring kayaks except for the fact they featured no kayak seat, rudder or hatches that were introduced only in recent decades. Some of the native kayaks were narrow and designed to be easily rolled in case of capsize, and others were wide enough to offer sufficient stability for a native kayaker. It is important to note that native kayakers were considerably lighter as well as shorter than the average, modern North American paddler. On top of this, native kayakers practiced kayaking for long hours since early childhood and were in most cases more athletic and in better physical shape than the average North American touring kayaker. Such differences in stature, weight and skills have a critical effect on essential issues ranging from safety to comfort, recovery, speed, tracking and maneuvering etc.

1.2    The Beginning Of The Kayak Touring Era

Canoeing became popular among settlers in North America, who adopted various native canoe designs for touring the continent’s waterways as well as for transportation of people and goods. Kayaks remained unused because canoes had the advantage of having a greater load capacity and were easier to paddle with a crew of two or more passengers. Sometime after the middle of the nineteenth century trains, motorized boats and later trucks and cars made canoes obsolete for utility touring, but at the same time people began to have more free time and disposable income, and began paddling canoes instead or rowing boats as a popular recreational, outdoor activity.  Kayaks were accepted as mainstream recreational paddle crafts starting in the sixties, as the new American society became increasingly centered on the individual. For this matter, the kayak had the advantage of being easier to handle and propel by a single passenger than a canoe is. It is then that the traditional sit-in kayak design was hybridized with the paddle board and the first sit-on-top (SOT) kayak came to this world. Gradually, with the evolution of the consumer society it became fashionable to own a touring kayak, similarly to owning other individual recreational equipment such as a pair of name brand skis, a set of golf clubs or the latest model of fancy bicycle.

1.3    The Roaring Nineties

This trend reached its peak during the second half of the 1990s, as the soaring stock market coupled with the boom in Information Technology markets made it easy for urban professionals to buy increasingly expensive recreational sporting gear. It is during that period that expensive touring kayaks hand made from new, fiber reinforced plastics (FRP) became fashionable, and many small and medium size touring kayak manufacturing businesses thrived. This trend was equally fueled by the natural tendency that people have to compare the gear they’re using, and to assume that the more expensive the kayak the better it is.  It is in this brief half decade that many kayak touring clubs were founded and many paddle shops got into the business of selling touring kayaks.

1.4    Kayak Touring Today

Things have taken a downward course around the 2001 depression, and a new era in kayak touring has begun. Some called the beginning of this new trend the ‘Touring Kayak Meltdown”, and it reflected a number of developments – The first being a considerable drop in sales of expensive touring kayaks and at the same time a rise in sales of low-cost recreational kayaks. The second is a decline in participation in kayak touring activities such as club tours, and a rise in recreational kayaking activities including rentals, non organized short trips and kayak fishing. The difference between the trend setting kayaks in the nineties and the trendy kayaks today is not only in price and materials (rotationally molded polyethylene being the most popular material today), but also in the basic design concepts. The typical touring kayak used to be a very long, very stiff (I.E. brittle) and very narrow sit-in kayak. These attributes served the purpose of enabling higher speed and practicing the Eskimo Roll. In comparison, today’s typical touring kayak is shorter, wider and roto-molded I.E. not as rigid as an FRP (‘composite’) kayak, and it’s as likely to be a sit-on-top as it is to be a sit-in kayak.  As for the sit-in concept, most of these modern kayaks are very wide and not used with a spray skirt since they are not intended to be rolled.

2. Categories Of Touring KAYAKS

  • Expedition Kayak – For long range trips of many miles and several days or more. This type of kayak touring is the most demanding from both kayak and kayaker.  The kayak needs to be solidly built and gig enough to store the gear and provisions required for a long trip. Because of its size a weight it should be stable enough to minimize the need for rolling. Expedition kayaks are the biggest touring kayak as far as length is concerned, and they can be longer than 20 ft.
  • Sea Kayak – For Sea Kayaking on very large bodies of water (E.G. Great Lakes, Ocean) in a group of at least two kayakers. Typically, sea kayaking trips are not longer than one day.  The sea kayak is required to be fast enough for its user to keep in pace with the other kayakers in the group. As for the actual seaworthiness of such boats, the reader is welcome to read the article ‘Are Sea Kayaks Seaworthy?‘. Sea kayaks are very long, somethomes over 20 ft, and typically very narrow, and their users must outfit them with spray skirts.
  • Tripping Kayak – For long journeys, mainly on rivers and lakes. The tripping kayak is required to be strong enough to withstand the hardships of going down rapids, multiple beaching on rocky shores etc. It also has to offer sufficient load capacity for gear and provisions.
  • Touring Kayak – A kayak designed for paddling over longer distances, usually in groups and sometime for more than one day. Touring is often combined with other recreational activities such as camping, photography, bird watching etc.  Touring kayaks include a broad range of designs that are generally faster than whitewater, surfing and recreational kayaks and slower than racing kayaks.
  • Day Touring Kayak – A kayak for leisure kayaking trips shorter than one day. These kayaks are typically shorter and wider than expedition kayaks and sea kayaks.
  • Recreational Touring Kayak – A kayak that offers leisure paddling limited to short trips in both time and distance terms. These kayaks are shorter and typically wider than other touring kayaks, which makes them slower too.

3. The Touring Kayak Design

The touring kayak has to fulfill a number of sometime contradictory requirements of which the two essential ones are safety and comfort. Next come speed and maneuverability, which are important as well but not critical. Load capacity and storage come last and their importance is reduced if the kayak model is designed for shorter trips and calmer waters, as most touring kayaks are nowadays.

3.1    Safety

This is obviously the most critical requirement, and it is a complex, multidimensional one.
The first thing that comes to mind when discussing kayak safety is the ability of the kayak to protect its passenger from dangers including drowning, injury, exhaustion, hypothermia etc.
For example-
A kayak with too little free board might eventually fail to prevent water from getting inside the cockpit. In extreme cases the extra weight might impede and even sink the boat, and in cold water and weather it could cause the passenger severe discomfort, exhaustion and even death as a result of hypothermia.
A kayak that’s too narrow to offer sufficient lateral stability to its passenger is prone to being overturned by external forces such as waves, boat wakes etc., or as a result of an accidental error made by the passenger in a moment of inattention.
The paddling community is divided between the traditional, small and diminishing minority of those who see the Eskimo Roll as the ultimate recovery method and an already overwhelming and growing majority of those who prefer to paddle wider, more stable boats than increase the risk of capsizing by paddling narrow ones.
A kayak that does not offer sufficient legroom and good ergonomics will cause its passenger to suffer from discomfort, fatigue and sometime exhaustion. Such kayaks often cause cramps in the legs and thighs, leg numbness and back pain that could lead to serious boating accidents. In the long run uncomfortable kayaks might cause lasting back injuries.
A kayak designed for high speed and therefore made from very lightweight and rigid materials such as carbon fiber is also more brittle than a kayak molded from polyethylene, and might develop cracks when hitting rocks or ice.  Needless to say, that a cracked hull in cold water can be fatal. Unfortunately for passengers of such kayaks, the colder the temperature the more fragile the hull becomes.
These examples show how the requirement for additional speed might reduce both the kayak’s mobility and safety.
In this context it is appropriate to stress that designs and techniques that were perfectly acceptable and useful for native kayakers are no longer practical for most modern non-professional kayakers – including those who think otherwise.

3.2    Ergonomics and Biomechanics

These subjects are already discussed in depth in another article called ‘Biomechanical and Ergonomic Solutions To Modern Kayaking’ (Article).
In essence, when choosing a touring kayak it is useful to remember the following points:
You are going to spend many hours at a time in this kayak, and what may seem comfortable to you in the first fifteen minutes of paddling might turn to be a nuisance and sometime a source of pain after an hour or two, and it may even cause back injuries over longer periods of time.

3.3    The Kayak Seat

This is a modern-days accessory that native kayaks did not feature. Kayak manufacturers introduced it as a support for the kayaker’s back in order to prevent it from ‘falling’ backwards as a result of sitting in a position that’s not appropriate for people who are no longer used to sitting on the floor, that is nearly all of us Westerners.
But the seat has not solved the ergonomic problem at its root- it just changed the symptoms: Now the supporting structure itself I.E. the seat’s backrest created a pressure point in the kayaker’s lower back, and while generous cushioning may dissipate to a certain level and postpone the discomfort it certainly does not eliminate it.
In fact, the kayak seat created a second problem, which is the lack of sufficient support for the kayaker’s feet: Instead of the back ‘falling’ backward the feet are ‘sliding’ forward, which is why they require a rigid, vertical accessory to stop them, and that’s what the foot rests or foot braces effectively do at the cost of increasing the pressure on your lower back.
And while the kayak seat has become standard in all commercial kayak models because without it hardly anyone would be able to paddle them, it has also become the Achilles Heel of the touring kayak since it merely transforms one ergonomic problem to another, and touring kayakers paddle for long hours…

3.4    The Cockpit

What’s a cockpit?  -Basically, it’s the space in the boat from where the person who controls the vessel sits or stands.
Sit-in kayaks have a small cockpit in the boat’s center, where the seat is fixed in its place. This design offers little protection from waves and spray, and enables a single sitting position with restricted legroom. If you want better protection you can cover the opening with a tight spray skirt, and by doing so you’ll be locking yourself inside the cockpit for better or for worse… with intermediary degrees of discomfort such as being seated for long hours in a puddle of water since eventually water doesn’t fail from getting inside.  You may also experience overheating in the summer and cold in winter, and acute discomfort resulting from the fact you are forced to remain seated in the one and only sitting position that’s offered to you – and it’s not even a comfortable one.
When it comes to sit-on-top (SOT) kayaks, you’re not even offered a proper cockpit space to speak of but rather an area on the open deck of a craft that’s basically little more than a re-designed paddle board that’s paddled like a traditional kayak.  The (virtual) cockpit of a SOT offers you no protection at all. In fact, SOT kayaks’ cockpits have holes in them that go from their deck to the bottom of the kayak.  These ‘scupper’ holes are there to drain the water that accumulates in seat area, but as soon as the water gets a little rough they also let water go up in the other direction, wetting you and your gear…
As far as comfort goes a SOT’s cockpit may be somehow less restrictive than the cockpit of a sit-in kayak, but the essential problems remain the same, plus you’re more likely to go overboard unless you attach yourself to the deck with ‘thigh straps’, which isn’t safe even if you can roll a sit-in kayak.
The SOT’s cockpit (or lack thereof) is the reason why you would hardly see SOT touring kayaks anywhere in colder regions.
In sum, as a touring kayaker you should consider whether the cockpit of a kayak model offers you a functional space or if it is just a ‘place’ inside the boat or on its deck.

3.5    Storage Hatches

Imagine yourself paddling your new touring kayak on a big lake or some other large body of water, and the weather is getting windy and unexpectedly cooler so you’d like to wear your sweatshirt, which you stored just two feet away from you… but you’re unable to grab it because it’s in the hatch…
Then your cell phone rings and you’d like to answer the call but although your cellphone is just a couple of feet away it’s unreachable because it’s in the hatch… Then you run out of paper handkerchiefs for your running nose, and although the extra package is onboard your kayak there’s no way for you to reach it until you beach somewhere – because it’s in the hatch…
So, the rule for hatches is that they are designed for storing objects that you wouldn’t need on board.
Now that same unexpected change in the weather is generating some waves. -You paddle to shore and beach your kayak (while stepping in water) and open the hatch just to find that the sweatshirt you stored there for such cases got wet from water that got in, as well as the extra package of paper handkerchiefs and your cellphone…
Such stories are so common that some kayak outfitters would tell you that whatever you bring onboard your kayak is likely to get wet – including yourself.

3.6    The Rudder

Even your kayak dealer or outfitter is likely to tell you at some point that you should try to avoid using one…
Native kayaks had no rudders but modern kayak manufacturers noticed that most of their customers were facing difficulties in tracking and maneuvering their kayaks.
The problem with conventional (I.E. mono-hull) kayaks is that the longer they are the harder it is to maneuver them, which could be a severe problem in rough waters and weather since you may be going in a straight line but not necessarily in the direction of your choice because the wind, waves and currents would outmaneuver you…  -But the shorter the kayak the less well it tracks, which is too bad since in a short rudderless kayak you’ll find yourself zigzagging your way to your destination instead of going straight there.
So why are rudders so controversial?  -Simply because they obviously add an element of complexity and technical difficulty to the kayaking experience.  However, there is another tradeoff to consider – one that’s less apparent, which is the fact that a rudder slows your kayak down by 10% in average. In other words you have to spend 10% more time to get where you want to go, and you’re likely to work harder getting there because using a rudder requires that you overcome a new set of hydrodynamic and biomechanical problems…(2)

3.7    Additional Passengers On Board

Traditionally, touring kayaks are solo boats, and if you want to go kayak touring you need a tandem model, which is not practical for a single kayaker.
This is a less than optimal solution, and in fact it’s even inferior to solutions offered by canoes.
SOT kayaks are somehow more flexible on this issue, and in some cases the ‘guest seat’ on the deck can accommodate an additional passenger for short rides, but in such cases the kayak becomes laterally unstable and is not it’s not balanced fore and aft and therefore becomes even more difficult to paddle.
But additional passengers don’t necessarily have to be paddlers like you – They can also be small children or dogs, and it goes without saying that both their safety and comfort must be assured.

paddling our Wavewalk 700 tandem touring kayak

3.8  Speed

This is possibly the most discussed subject related to kayak touring yet it seems to be unclear to many kayakers.
The first issue that needs clarification is what makes a kayak go faster?
The answer is obviously the power and skill of the kayaker, plus the design of the kayak itself that enables the kayaker to use these resources efficiently.  Since kayakers differ greatly in physical attributes such as height, weight and strength as well as in their specific paddling skills and touring style a kayak that’s fast for one paddler may be slow for another, and vice versa in some cases or even as a general rule.
For example, a very narrow and long sea kayak may enable a kayaker to go faster on flat water than a shorter and wider kayak would, but it could be difficult to control in moving water such as rapids and surf, and therefore force the kayaker to go slower or even give up paddling it in such waters.
The classic example used by both kayak designers and outfitters is a very long and therefore potentially fast kayak that requires more power from its paddler because its increased length inevitably increases its surface area and thus also the frictional drag it generates when moving in the water…
Since the kayak is a passive object without a motor or sail of its own its speed depends its hydrodynamic qualities but possibly even more on its ergonomic and biomechanical design, or simply on what its physical impact on the paddler is.
Therefore, when choosing a touring kayak it would be beneficial for you to consider speed not necessarily as the first and foremost parameter but as yet another feature that comes at a certain price that you may or may not want to pay. You should take into consideration what type of kayak touring you’re likely to practice, and who are going to be your paddling partners. Obviously, if you intend to paddle together with kayakers who paddle fast you’d better paddle a fast kayak – but only if you’re a good kayaker yourself.  Otherwise, if like most touring kayakers you’re planning just to spend time kayaking alone or in the company or others who share the same mindset without rushing anywhere you should put speed in a much lower priority.

4.    The Kayak Touring Experience

4.1    Comfort

After reading about the safety requirements it’s easier to understand why comfort should be a critical requirement from your touring kayak.
Comfort is a multidimensional issue as well, which pertains to ergonomics (mainly minimizing fatigue), biomechanics (mainly efficiency of paddling and injury reduction) and easing the operation of the boat (just ‘Keep It Simple S…’)
In previous sections of this article we discussed some comfort issues in a safety context, but comfort is also important in itself since it’s the number one factor that’s likely to determine the overall quality of your kayak touring experience, and thus will determine if you’ll be satisfied with your kayak choice and possibly even whether you’ll stick with kayak touring as a preferred outdoor activity.

4.2    Mobility: Launching, Beaching Etc.

Both launching and beaching go to the kayak’s performance in terms of mobility, which is at the core of kayak touring: A good touring kayak should offer you the ability to launch from more places and get back to land whenever you want.
Many people find it difficult to enter a sit-in kayak, and they don’t appreciate the elaborate maneuvers required to perform what should be a simple thing. Obviously, the same thing goes for beaching your kayak and exiting it…
This is not just a matter of basic convenience but also one that has safety implications, especially if your kayak is made from one of those extra-light materials (E.G. carbon fiber reinforced plastic) that are very rigid as well as brittle. You may find that your pride and joy developed a crack in its hull because you beached it a bit too roughly, and such a discovery may occur while you’re paddling it…
So a touring kayak should be easy to get into and out of, and it should better be ‘built tough’.
Sit-on-top (SOT) and open-cockpit kayaks are much easier to enter and exit than sit-in kayaks, and this is one of the reasons that make them more popular than sit-in models. However, what makes such kayaks easier to enter and exit is what eventually will offer you less protection from the elements…

4.3 Stand Up Paddling

Back in 2004, when Wavewalk offered the first generation of kayaks enabling stand up paddling in full confidence, some pundits of the kayak touring world scoffed, and others ignored us. Today, after the market for stand up paddling (SUP) on paddle boards has become much more popular than kayak touring, the Wavewal 700 catamaran kayak is till the only one to offer all people regardless of their physical fitness both kayaking and stand-up paddling in full confidence and comfort. W700 paddlers enjoy both a relaxing change of paddling positions, as well as a new way to look at the world around us, and enjoy it.

5. What’s Important To Remember

The kind of kayak touring you practice may be different from someone else’s, but all touring kayakers are basically seeking an experience that may have to do to some extent with nature, freedom, escape, adventure, group participation, family, friends, healthy exercise and most of all – fun.
This precious, personal experience could be damaged by people who confuse kayak touring with racing, or others that have a tendency to compete in kayaking skills and knowledge, or by those who show off their latest acquisitions in expensive kayaking gear, electronic gadgets etc.
Your kayak touring experience can also be ruined by an inadequate kayak:  Regardless of price, your kayak is no good if it doesn’t contribute to your own, personal touring experience, so if anyone tells you what experience you should be after or what boat is proper for you just remember that these are personal things that you need to discover by yourself and for yourself – even if it takes a long time and possibly switching kayaks.
The type of kayak touring you like and the touring kayak you like are best for you, period. You shouldn’t let individuals who may be ‘purists’, ‘gear freaks’ and ‘tribal chieftains’ affect your personal judgment.
It is inconceivable that your choice of a touring kayak would be affected by considerations that may have been relevant to native hunters of the polar circle in the distant past.  Things have changed since then, and both your needs and capabilities are very different form theirs, as well as the number and types of kayak concepts and designs you can choose from nowadays.

What Do Kayak Touring and Kayak Fishing Have in Common?

Fishing is the most popular application among people who use Wavewalk kayaks. These people need kayaks that are particularly stable and comfortable, and would enable them to go on lengthy trips in the quest for fish, and spend long hours in their kayaks without suffering from any sort of pain, discomfort or wetness, while moving swiftly from one fishing hole to another in the same fishery, or between different fisheries. Such trips often take place in less than favorable weather and water conditions, such as under wind, which is why these paddlers appreciate their Wavewalks’ unrivaled tracking capability. Needless to say that such anglers take plenty of fishing gear on board, and some take camping gear as well, and they love their W700 kayak because it offers more storage space than any kayak out there.
The same basic requirements apply to kayak touring, which makes the Wavewalk 700 particularly appealing as a long-distance touring kayak, a.k.a. Expedition Kayak.

More information on rudders is available in the article ‘Are Sea Kayaks Seaworthy?’

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Swivel seat and gas tank for my S4

By Dave Bragg

Florida

I wanted a comfortable seat with back support for my S4. My answer was to buy a boat seat and make a bracket with a round post that friction seats into any of the holes. I’m going to make another for my guest. Pictures attached. Once I made the bracket and post, it got several coats of spar urethane

The tank I bought is 8″ thin with the connector sticking out of it, but still too thick to easily remove and fill. I was unable to find a resource to sell a marine tank that’s thinner.

Bottom view of swivel seat for S4 skiff

Bottom view of swivel seat for S4 skiff - folded

Portable fuel tank for skiff outboard motor

Motor Power Rating For Canoes, Kayaks, and Small Boats

Updated June 5, 2024

What Boating Regulations Apply To Classifying Canoes, Kayaks, and Small Boats, and to Motorizing Them?

The United States Coast Guard (USCG) is a branch of the United States Armed Forces, and it is authorized to enforce U.S. federal laws, including those pertaining to safe motorizing of small boats. See: The Code of Federal Regulations (CFR) Section 183-53 of Title 33 Volume 2 Subpart D — Safe Powering

What Is The HP Rating For Canoes and Kayaks?

There is no specific definition for Canoes and Kayaks within the regulation, but the USCG uses the American Boat and Yacht Council (ABYC) definitions. These definitions are found in the ABYC H-29 Standard “Canoes and Kayaks”, and serve to evaluate whether or not a vessel should be considered a Canoe, a Kayak, or a small Boat (monohull boat), and whether a canoe or kayak powered by a motor does not exceed a safe powering maximum rating.

ABYC H-29 Standard Provides The Following Definitions:

Kayak: A watercraft designed to be manually propelled, typically without provision for auxiliary power, with the occupant intended to be seated with legs approximately 90 degrees from the torso.

Canoe: A watercraft, designed to be manually propelled, with or without provision for auxiliary power, with neither end having a transverse dimension greater than 45% of its maximum beam and conforms to the following specifications:

CANOE LENGTH MAXIMUM CANOE BEAM [WIDTH]
Up to 14 ft (4.25 m) 1/3 of the canoe length
14 ft -16 ft (max 4.9 m) 1/4 of the canoe length
Over 16 ft 1/5 of the canoe length

This means that a small vessel whose transom measures over 45% of its total width at its widest part may not be considered a Canoe (i.e. square stern canoe), even if it can be effectively paddled, and it will be considered a Boat, namely a monohull boat, e.g. dinghy, skiff, microskiff, Jon boat, and thereby fall under Section 183 Subpart D – Safe Powering .

Some canoe and kayak manufacturers offer mounts for outboard motors, or mount motors in the canoes and kayaks that they offer for sale. In these cases, the manufacturer must meet the auxiliary horsepower standards to be considered compliant with the ABYC H-29 standard.
These standards are:

CANOE / KAYAK LENGTH MAXIMUM HORSEPOWER RATING MAXIMUM KILOWATT RATING
Under 15 ft (4.6 m) 3 HP 2.25 KW
15 ft – 18 ft (5.5 m) 5 HP 3.75 KW
Over 18 ft (5.5 m) 7 HP 5.25 KW

Note: This table can be useful to evaluate claims that manufacturers of electric motors make about the power in HP terms of the motors they offer.

For the purpose of rating the W720 Kayak-Skiff for maximum power (HP), Wavewalk defines it as a Kayak, and rates it for a maximum power of a 3 HP for an outboard motor mounted on it.

How Are Small Boats Rated for Max Motor Power (HP)?

There are two basic forms for a motorboat: Monohull and Multihull.
The Code of Federal Regulations, Title 33, Chapter I, Subchapter S Boating Safety, Part 183 Boats and Associated Equipment, defines a monohull boat as follows:

Monohull boat means a boat on which the line of intersection of the water surface and the boat at any operating draft forms a single closed curve. For example, a catamaran, trimaran, or a pontoon boat is not a monohull boat.”

Part 183 Boats and Associated Equipment includes the federal safety requirements from boats under 20 ft long. Canoes, Kayaks and Multihull Boats are exempt from most of these requirements that Monohull Boats are subject to, including max motor power rating, per CFR Section 183-53 of Title 33 Volume 2 Subpart D — Safe Powering

Subpart D—Safe Powering § 183.51 Applicability.
This subpart applies to monohull boats less than 20 feet in length, except sailboats, canoes, kayaks, and inflatable boats, that are designed or intended to use one or more outboard motors for propulsion.

The USCG Recreational Boat Testing and Compliance Inspection Program has clarified to us that in order for the Wavewalk S4 to meet the requirements of the Multihull Boat standard, its twin catamaran hulls must each have a distinct water waterline of its own, and these waterlines should never intersect and merge into a single waterline, even when the S4 is at its maximum recommended load of 600 lbs.
Indeed, according to these criteria, the S4 is a true catamaran, namely a Multihull Boat in the full sense.

Note that a Tunnel Hull boat is not a true catamaran (multihull), but a monohull, because it is designed to have the water reach the top part of the tunnel between the two longitudinal sides of its hull, and therefore it has only one waterline, effectively.

Why Rate The S4 Microskiff For Maximum 6 HP?

In order to mount a motor bigger than 6 HP on the S4, the owner must reinforce the boat’s transom motor mount, which is not rated for more than a 6 HP motor.
Due to shipping problems, Wavewalk is prevented from installing the mounting plate on the boat at the factory, and it is the boat owner who installs it, after which they can reinforce the motor mount, in case they want to outfit their boat with a more powerful and heavier motor for which the S4 is not rated. However, the company does not take responsibility for such projects, or for any other DIY project that a client may undertake, so it is prevented from rating the S4 for more than 6 HP.

Overpowering a Boat

Note that outfitting a boat or a kayak with a motor that’s more powerful than the HP for which it is rated is called Overpowering, and some states consider it as illegal.
Also, Overpowering is generally not well viewed by insurance companies.

Registering a Boat or a Motorized Canoe / Kayak

All states require that any motorized vessel, including canoes, kayaks and multihull boats be registered with the local authorities. In most cases the state’s Department of Motor Vehicles (DMV) provides the registration service, but in some states other government organizations are in charge of these matters.

In most states, registering a motorized canoe or kayak does not require issuing a title but registering a boat does, and in some states even a motor boat doesn’t require the issuance of a title.

In most cases, registering a W720 kayak with the authorities does not require issuing a title, but registering an S4 Microskiff multihull boat does.

The registration of a motorized canoe / kayak or a boat requires presenting to the authorities a Manufacturer’s Certificate Of Origin (MCO) for the vessel, as well as a Bill Of Sale (BOS). Wavewalk and its dealers provides signed copies of both documents at no charge.

Read more on this subject: S4 Microskiff Powered By A 9.8 HP Tohatsu Outboard Motor

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