The S4X2 Twin Boat

Twin S4 Multihull Boat

The Concept and Basic Figures

In the next months, Wavewalk will develop a twin S4 “quadramaran” boat – a double catamaran featuring four hulls in total.
People have been tying together small and bigger boats for many years, from canoes and kayaks to larger vessels, and the S4X2 will simply be an improved version of this concept.
With its total width of over 80 inches, the S4X2 will be extremely stable and seaworthy, and its estimated load capacity will be over 1,000 lbs, which means that it could carry a driver and three full size adult passengers, plus plenty of camping, fishing, hunting or diving gear. Everyone on board will be able to stand up at the same time as the other passengers, and fish in this position.


The boat will be made from a pair of Wavewalk S4 multihull boats attached together by means of a lightweight wooden structure reinforced with bolts and  metal brackets. The estimated total weight of this boat is 220 lbs without the motor and payload. This includes two times the 100 lbs that each S4 weighs, and 20 lbs for the wooden structure.

Partial view of an S4X2 multiboat
Partial view of an S4X2 twin boat made from two S4 skiffs assembled together

Portability and Mobility

The main advantage that this boat will offer over other boats of similar size is that even one user could take it apart quickly and easily, and transport it non-assembled without a trailer, if the transporting vehicle is big enough, such as a minivan, a big SUV, or a big pickup truck.
The boat’s easy transportation and assembly capability will greatly enhance hits users’ ability to launch it almost anywhere, without necessarily relying on boat ramps.

Power and Speed

Being stabler and more seaworthy than its individual component boats, the S4X2 could be powered by a bigger outboard motor. How powerful remains to be seen, and current estimates are up to 20 HP, which means that it may reach 30 mph.
Alternatively, two S4 owners could join them together, and power their ad hoc S4X2 with two small outboards normally used separately on each of the S4 boats. In such case, a wooden structure would not be necessary, since the main purpose of this structure is to enable driving the S4X2 with one powerful motor attached along its center line.
Note that the combination of two small motors will not be yield much more speed than each of the small outboards can deliver separately, but it will be more powerful than a single small outboard, and useful to move heavy loads.

Twin S4 Multihull Boat
Top view of an S4X2 multi boat


The ability to quickly assemble and disassemble this boat will make it perfect for multiple uses. For example, in a capacity of a tender (service boat) for a big boat, a group of passengers could go on shore in an S4X2 , and return to the mother ship in different times, in two smaller groups, each using a single S4.
Similar scenarios can be imagined for hunting, fishing and diving trips, and tours with people who have different interests and/and schedules.
In this context it is important to remember that the S4 works perfectly not just as a motorboat, but as a paddle craft (canoe or kayak) as well. Carrying a spare, small electric outboard on board an S4X2, or even a small gas outboard will be easy, and doing so could turn the two S4s components into completely independent vessels.
However, if the owner of an S4X2 is interested mainly in versatility, they should bear in mind that a single S4 is not capable of taking a 4-Cycle outboard motor that’s over 10 HP, due to the motor’s weight at the stern. In other words, there will be a tradeoff between maximum speed and maximum versatility.

Skiff Casting Deck

Outfitting an S4X2 with a casting deck will be very easy – just cover the front end with a sturdy plywood board cut to the desired shape.


Four hulls for one boat is excessive,  but the exceptional tracking ability delivered by this rare structure, combined by its extreme stability, will be most useful for sailing.


Paddling will be very limited in the S4X2, pretty much like paddling is for passengers of a good size skiff or a big Jon boat. This could be a bit of a challenge when beach launching and beaching, especially if there is only one person on board.

Sea Trials

Wavewalk plans to begin a series of sea trials for the S4X2 during the summer. The R&D will focus on testing the strength of the structure, the boat’s performance in rough water, possible need for a spray shield, launching and beaching, carrying the components over short distances, assembly and disassembly, and so on. Bigger motors will be introduced at a later stage.

Wavewalk S4 Updated Slideshow

WAVEWALK S4 Micro Skiff

Wavewalk released its updated animated GIF slideshow for its S4 microskiff, shown above.
This is an opportunity to highlight some of this boat’s unique features and important advantages. By the way, most of these images are screenshots from videos that feature on Wavewalk’s website and YouTube channel.

  1. The first image shows a white S4 cartop microskiff outfitted for flats fishing, including a paddle and a stakeout pole. Simply, it looks great!
  2. The next image shows two bikini clad girls sitting on a beached white S4 used as a runabout, namely a compact touring and leisure boat, or a perfect tender for a big boat, or a yacht.
  3. The third image shows the S4 in the Gator Green color that’s popular among inland anglers, duck hunters, and wildlife photographers. Launch, go, and beach anywhere.
  4. Image number four shows three guys sitting in an S4 and enjoying a ride in the ocean. This is something you’d expect to see done in much bigger boats.
  5. The fifth image is a top view of the S4 that shows how roomy its cockpit is for passengers, and how much storage space it offers.
  6. Sixth image: Thanks to its being so lightweight (barely 100 lbs), car topping the S4 is so easy that one guy can do it by himself.
  7. The seventh image looks a bit surreal: Three guys catching fish standing in their white S4 microskiff. But they actually did it, and were photographed by the girlfriend of one of them, who happened to be there.
  8. Image number eight was downloaded from a particularly exciting video that shows the S4 driven in the ocean chop with a 10 HP outboard. It looks almost like a racing boat!
  9. Four people going in a S4? Image number nine was shot from a drone that one of them brought with him on a short trip to an island off the coast of West Palm Beach, Florida. The driver was an ex Navy SEAL with a lot of sea experience, so don’t try this yourself!
  10. Image number ten is unique on the Internet: Three adults paddling standing in an S4 in a kayak capacity. You can watch the full video on Wavewalk’s website, or on its YouTube channel.
  11. Image number eleven is yet another screenshot from the video that shows the S4 driven solo in the ocean chop, this time with the driver standing up.
  12. The 12th image is a bird’s view of the S4 driven in the ocean, leaving a minimal wake behind it – a visual testimonial to this boat’s hydrodynamic efficiency.
  13. Image number thirteen is a closeup of an S4 driver sitting comfortably, and going full throttle, in full comfort and utmost stability.
  14. The 14th and last image shows the same driver, this time driving standing up, in full confidence and absolute control of his boat.

The story of the W500, the best fishing kayak for its time

W500 powered by a 2 HP outboard motor

When Wavewalk launched the 500 series (W500), in 2009, it became a big success overnight, and people stopped ordering the previous W300, which got canceled soon after, in 2010. Simply, the W500 design was a bigger and much better version of the W300, which didn’t have a chance to survive.

The W500 offered what no kayak could until then – Super stability coupled with zero back pain. On top of this, its onboard storage space was several times bigger than the storage space that any fishing kayak offered, and it could take a second passenger on board, providing this person wasn’t very heavy.

For a kayak that offered a load capacity of 360 lbs, the 60 lbs W500 was very lightweight. This 6:1 Load to Weight (L/W) Ratio was improved only in 2017, with the 6.5:1 L/W ratio of the S4.

In 2010, Sungjjn Kim from South Korea successfully outfitted his W500 with a 2 HP air-cooled outboard gas motor from Honda. This was a huge breakthrough in motorized kayaking, and a most significant event for Wavewalk. Before that, anglers dared outfitting their kayaks only with feeble and sluggish electric trolling motors that offered poor performance and a limited range of travel.

Soon after, Wavewalk started experimenting with Sungjin’s motorized kayak concept, and presented it to the public in articles and videos, including videos that showed it successfully driven in the ocean chop. Clients reacted positively to these ideas, and a new class of vessels was created – the cartop kayak-microskiff, an ultralight, fun, versatile and inexpensive boat that worked well as a paddle craft too.

In 2013, Kenny Tracy from Maryland outfitted his W500 with a powerful, water cooled, 6 HP outboard motor from Tohatsu. He squeezed 13 mph from that rig – faster than any motorized kayak prior to that. This was the first step in the creation of a high-performance W500.

Following Kenny’s success, and in view of the safety limitations associated with the use of such a tiny kayak with a heavy and powerful motor, Wavewalk started offering  a version of the W500 called the W570, which was essentially the same model outfitted with large-size, detachable, inflatable side flotation modules. With the W570, Wavewalk also offered a lightweight, detachable spray shield.

But it became clear that adding power and accessories to the small W500 would not satisfy the market’s demand for high performance cartop microskiffs, and in 2015, Wavewalk came up with its W700 series. The W500 cost 20% less than the W700, and weighed 20 lbs less, but in the long run, these two advantages weren’t enough to compete with the bigger and better W700. In 2017 , the  little W500 got further squeezed by the advent of the high performance S4, and eventually, this year, 2020, Wavewalk suspended its offering of the W500.

During the decade in which the iconic W500 was available for sale, it sold in 30 countries worldwide. People have used it for touring, diving, crabbing, fishing, shrimping, hunting, camping, bird watching, photography, positioning rowing shells before races, searching for sunken artifacts, sailing, tendering big boats and yachts, scientific research and engineering, as well as maintenance of bridges, harbors, and waterways.

The W500 offered people with severe back problems to enjoy kayaking, boating, and fishing, without suffering from any back pain or other ergonomic issues. Even people with Multiple Sclerosis (MS) benefited from its remarkable stability and comfort.

Wavewalk did not fully discontinue the W500, and the company will consider taking the W500 tooling (rotational mold) out of mothballs if an opportunity for large size orders presents itself.



Jon Boat vs. Wavewalk S4

Green S4 boat in flooded wooded area

Jon boat vs the Wavewalk S4 – Can you even compare them?

Job boats are a family of boats that range greatly in size, stability, load capacity, speed, etc, while the Wavewalk S4 is one boat.  So how are they comparable to begin with?
The answer is that it depends – Comparing the S4 to an 8ft wide, 24ft long Job boat is rather pointless, unless you talk about seaworthiness, since the S4 is probably more seaworthy. Other than this, the large size Job boat would be more stable and faster, and have a much bigger load capacity.
In other words, if you need to go in rough water, an S4 is probably a better choice, and the same is true for skinny (extremely shallow) water, since the S4 drafts less, and you can paddle it if needed, or pole it, and if the water gets too shallow, such as at low tide, you just get out of it and pull it until you reach deep enough water. This is to say that you can’t get stranded in an S4, while it’s quite possible that you would in a big Job boat.
Also, the nimble S4 is more suitable for moving in areas with thick vegetation, such as flooded woods.

But this is a bit of a stretch in terms of a realistic comparison, and it would be more useful to compare the S4 to medium size and small Job boats, namely Job boats designed to carry up to two passengers, and go at low to moderate speeds.

When compared to medium size Jon boats, the main weakness of the S4 is its humble load capacity: 600 lbs of payload is a huge number in the kayak world, and it’s even good in comparison to small, 10ft to 14ft long Jon boats, but a typical 16ft Jon boat can take a payload of over 1,000 lbs, and this makes a significant difference.

Other than this, the S4 is rather limited in the power of the motor that it can take. A 10HP outboard is close to the limit of its capacity, and this is a rather small motor for a medium size Jon boat, let alone a big one.  In other words, medium sized and big Jon boats are potentially faster than the S4.

So where does the S4 shine?

Again, the S4 is one boat, so it’s hard to compare it effectively to the whole range of Jon boat sizes, but let’s start with the obvious: The S4 is much more stable for its size than comparable Jon boats. It’s also easier to paddle, even by comparison to very small and narrow Jon boats. Jon boats have a flat bottom, which limits their usage to flat water, while the S4 is used routinely by anglers who fish moving water, choppy water, and even blue water, namely offshore.

The S4 weighs 98 lbs without a motor, which puts it on par with the smallest Jon boats. Practically speaking, this means that the S4 is a car-top boat, while most Jon boats aren’t, and they require a trailer for transportation, and in its turn, this fact limits their owners in terms of places that they can launch from.

In other words, the S4 has a broader performance envelope, which makes it much more versatile than the Jon boat design. This may justify the higher price of the S4, compared to smaller Jon boats.

And last but not least – The Jon boat is a sturdy work horse that doesn’t look as appealing as its close relative the skiff. It’s not designed to please the eye, let alone to be a babe magnet. But the S4’s unique combination of a catamaran design and pointy front deck makes all heads turn, and this is priceless.

Wavewalk S4 powered by a mud motor
Chris Henderson’s duck hunting S4, with retriever dog and Twister mud motor (surface drive), and a pair of lightweight all-terrain wheels.
Duck hunters standing next to a Wavewalk S4
Not all duck hunters who posed here with their catch can go inside the S4 cockpit, because the mud motor requires more room for steering and operation.
S4 with surface drive motor
The S4 can carry many dozens of duck decoys in the huge storage space offered by its twin hulls.
Green S4 with outboard motor
Doesn’t look like a Jon boat…
S4 micro skiff - Jon boat for hunting
S4 outfitted with a platform for hunting dogs. Austin Rykbost, South Carolina

The Internet domain is for sale »

Motor Kayak vs Microskiff

S4 motor kayak with three fishermen on board

Intuitively, most people understand that a motor kayak is just a kayak powered by a motor, while a microskiff is a type of small, flat bottomed boat. In this article, we will try to define as clearly as possible what a motor kayak is, and what differences there are between such a kayak and a microskiff, more specifically, a cartop (portable) microskiff, which is closest in size to a kayak.

Motor Kayak

A motor kayak is a regular kayak, preferably one that is bigger and more stable than a typical kayak, that is primarily propelled by its passenger(s) who use either paddles or pedal drives. In other words, it is a human powered craft. Such kayak, when outfitted with a motor, typically a weak electric trolling motor, is safer than a kayak that is only human powered, and it can travel to longer distances, and back.

Since kayaks are designed for human propulsion, namely for low power and low speed, they are very limited in the range of motors that may be used to power them.

The problems in motorizing kayaks range from poor means of control to lack of stability, discomfort, and excessive wetness. Arguably, a motorized vehicle, or craft that does not offer adequate access to its motor is not safe. For these reasons, a motor kayak is typically powered by an electric trolling motor, and used on flat, protected water.

The Wavewalk 700 is a catamaran kayak that is extremely stable, and offers enough free board and good protection to its passengers. The driver of a motorized W700 can easily and effectively access the motor, wherever it is mounted, and for these reasons, this kayak can be powered by outboard gas motors that are much more powerful than any electric trolling motor.

Read more about motor kayaks »


A microskiff is a small, flat bottomed boat, powered by one outboard motor. Typically, microskiffs are transported on trailers, and they are used for fishing in flat or protected waters. The very lightest microskiffs can be carried on the truck bed of a pickup truck, and the Wavewalk S4 weighs so little that can be conveniently car-topped.

Microskiffs, even small ones, are too wide and too heavy to be effectively paddled, and this is the main thing that sets them apart from motor kayaks. They are motorboats.  The S4 is different from other microskiffs in the sense that it’s more seaworthy, and it paddles pretty well, especially with a tandem crew.


  • Kayaks are human powered craft whose performance can be enhanced  by the addition of a small, low-power electric motors.
  • Microskiffs are small motorboats that are too big to car-topped or paddled.
  • The W700 is a catamaran kayak that works great both as a solo and tandem fishing kayak, and it can be effectively powered by an outboard gas motor.
  • The S4 is a high performance, seaworthy cartop microskiff that can be paddled as effectively as any large size kayak, or canoe.