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Image:WaveReaper2 200.jpg

: See also Article:WaveReaper and Stefan Nystrom

Because of its design, the WaveReaper™ by Circuminvent, is always self-adjusting regarding wave height and tidal shifts and higher or lower water levels, due to shifting weather patterns. The Wavereaper™ is always balancing itself out, to optimal level in the ocean.


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Official Website


WaveReaper With Water-brake


Build you own Wavereaper!

Free Licence

Circuminvent, and the Inventor Stefan Nyström, allows anyone to use the design for the Wavereaper

"In the times when need for energy is great, and prices are spiking, CircumInvent introduces, an unique offer, to the global community. Any private person, can for his own consumption, build your own WaveReaper, a wave generator. In return, an small donation is asked for only. Donation minimum size is set to 5 Us Dollar, Building cost estimated at this point to under 1000$, which in return would be gained back in a few months only. Build it yourself, with parts found in scrapyards, in wood or by bicycle parts! If you wish to sell energy to others, or produce WaveReaper generators for others to use, contact us, and a generous contract offer can be signed. The name of inventor Mr Stefan Nyström, and the product name WaveReaper®, must always be honored. As developments take place, updated versions of the building plans and photographs and video will be announced on this site.? Visit Circuminvent.

WaveReaper™ the Technology

Technology Page

"Waves work in a constant movement up and down, forth and back, and we can with the WaveReaper™, a simple mechanical device take advantage of this in a cheap way. 2 connected A frames is cast in concrete, and builds the main part of the generator, also flywheel is concrete, as well as the pulleys, with its inside one-way bearings. Pulley diameter is very small to gain higher speeds at the flywheel, this means the generator can be built cheaper.

As we said, the wave move up and down, but most generators, rotate around an axle, and the wave size varies a lot, and this creates problems, when you want to utilize the energy content of them. The current technologies regarding wave energy today, is very costly, which brings that it can't compete with other ways of making energy.

Another factor, water, and generators, yes almost any technology, are having problems, when it comes to the oceans salt water, without more expensive design and material. Water can leak inside equipment and ruin electrical circuits, and must therefore be safeguarded against corrosion, and in those cases it is under water, against leakage, and pressure. Also water-depth, and the special environment, which crave divers, and other expensive equipment, has made wave energy costly.

With other words, underwater technology is not cheap, with these problems to solve, which means high costs, and therefore more expensive energy for the consumer. This is not what we would like, so it's needed to solve the wave generation concept, to go around these problems. And the solution is simple, we can use basic items, as wire, plastic barrels, one way bearings, pulley, an axle, flywheel and generator.

That is the main components, in what up to day, is the cheapest wave energy technology in the world. It can even be built in wood or by choice bicycle parts! This is very good, in countries which have limited access to expensive metals, and heavy machining tools. Most of the parts in a generator, except wiring, can be made of wood or plastics.

Image:WaveReaper1 200.jpg

We will use a set of plastic barrels as boys, cost is low, and PVC isn't affected by salt ocean water. The barrels are placed near shore or longer out in deeper water, depending on amount of energy needed in particular wave plant.

Each barrel has a lifting force of approx 160 Kg. A wire is connected to the barrel, which goes to a brass block on the bottom, which is weighted down, with a big stone, and connected to another wire. The location of choice is the main parameter for the size of the barrels, smaller waves, smaller barrels, and vice verse. Wave heights can possible catch range from 1 foot and upwards.

Image:WaveReaper2 200.jpg

The number of barrels, can be larger, but i think, for practical reasons, a number of 10 on each plant, would be good, and reasonable, this amount, can in the shore line version, give up to 50 kW of energy, or even more if special locations, and in a plant that covers 100 meter of shoreline, that makes it, 300Kw per kilometer shoreline.

The barrels is on 5 meters distance from each other, and connected to the on land placed WaveReaper generator, via the "power transmitting wire" it is also is connected with a thinner wire, between them, so, if the power wire should break, the barrels, don't get to drift away, in the sea. This will also even out the possibility that the barrels, would smash into each other, when the sea is rougher.

The lifting capacity is also setting a maximum power input into the device, since if it is to large/fast waves, the barrels would not lift more than it can, and forces is kept within the range, chosen when constructing the WaveReaper plant. If the plant energy production exceeds its capacity, the water brake is activated, until wave height has settled to within its limits. The wavereaper is automatic in that sense.

Example, number of barrels in each row 10, and rows 10, the plant would be 20 x 20 meters of area, 400m2, and will have 100 connected wires, which transfer the mechanical energy, to the generator. A Wavereaper is very cheap to construct, paying itself off in about a years time.

Image:WaveReaper4 200.jpg

I have chosen to use cheap materials only, in this demonstration, because the need to bring down production costs, and make it possible to build this type of wave generation device, any where in the world, and with local materials, as car parts etc, which doesn't needs to be imported. Other materials could of course be used, and the schematics for its design of course, be different. Simple is better, it is said, and fewer parts, and bearings, will bring lower cost of building, and also repair.

We can here see energy content in waves, The numbers means kW per hour, and meters of wave. South America, 97 kW per meter of wave, for example, that means, a Wavereaper™ device, which is 100 meters broad, would generate 9.7 MW.

Image:WaveReaper3 300.jpg

This is a simple schematic, showing buoys, wire and one-way bearing, connected together.In case of storm and rough waves, it is a problem, for all wave energy constructions, however, the Wavereaper™, has a built in safety feature in its construction, that would avoid damage on the equipment, the water brake if the force is to great. this will make the Wavereaper™ possible to work in any weather, however it should be constructed, to take advantage, of the medium wave, that is present at all time, for best cost benefit of the plant.

The wire is connected to a chain in the end, witch works on a gearwheel sitting on a one-way bearing, mounted on an axle. This translates the pulling force of the wire, to an circular movement which is good for cheap generators. The wire is for this case 4 mm stainless steel, which give a lifting ability of approx 300 Kg before it brakes. Also plastic can be used as Pvc band, which today is commonly used for packaging goods on pallets, this type of Pvc band has high strength, and is also light, and cost-effective, of course the UV light from the sun is affecting it in the long run, but the part that is in the water, should be somewhat guarded from the UV rays.

Image:WaveReaper5 300.jpg

Flywheels is also mounted on the axle, to collect, even out/store the momentum which is produced by the lifting barrel, this will even out and, smooth the turning's of the axle, to the generator, which is driven by a pulley, who will give it correct rpm. A simple brake, which can never wear down, using water to brake the generator, see this in the video. A thermostat monitors coil temperatures in the generator, and if the generator spins to fast, heat is rising in the coils. The thermostat close the circuit, and start a water pump, which is situated in a box with 2 compartments, in the upper compartment, a paddle wheel is rotating, on the same axle, as the flywheel and generator. In the lower compartment water is stored. When the pump starts, the water is filling the upper compartment, this will brake the generator, until the coils have cooled down, a drain hole will automatically drain the upper compartment, so when the temperature has gone down, the generator will rotate again, and generate electricity. If the weather is harsh, eg. in a storm, the upper compartment, would be filled with water frequently, and, when the weather system has passed, the generator would function normally, this is a very cheap way to ensure that rough waves would not harm the Wavereaper. See an illustration of the brake in the video.

Pipes mounted on the wire, which means we can haul in and out the device, without leaving the shoreline. With this configuration, if one set of barrels malfunction, only 10% of the plants output is lost, it can be hauled in to the shore and serviced, with ease, and without complicated offshore operations. When the wire coming to the generator housing, a chain is mounted to the wire, which drive the Gear wheel, and the one way bearing, which makes the chain draw, when the waves raises the barrel, but let it spin freely back, when the wave height is going down again, also a small weight is connected to the chain, to make it even out slack of the wire. A flywheel is mounted, and a pulley drives the generator, evenly.

One-way bearing, with pulley and wire, with bigger loads, chain and gearwheel, is an option. One-way bearings can be seen in ex. bicycles, the rotate freely in one direction, but in the other direction, they grip, and transfer force, this is used in the Wave reaper, and makes it simple, and cost effective. The waves up and down, movement is translated to rotating movement, suited for a generator, of choice.

Benefits of the One-way bearing

The barrels will of course jump up and down in random patterns this will add to an even movement of the generator axle, and its flywheel, as soon as a wave has energy to contribute, it will transmit its force to the wire, and to the axle. The flywheel is storing the momentum gained from the waves temporarily.

Because of its design, the WaveReaper, is always self adjusting regarding wave height, and tidal shifts, and higher or lower water levels due to shifting weather patterns, no adjustment needed, the Wavereaper™ is always balancing itself out, to optimal level in the ocean.

Image:WaveReaper6 300.jpg

No computer monitoring is needed and that also brings costs down, and no complicated technology, which would need delicate conditions, or a lot of service. This technology, is in as private, non commercial, or company, 15Kw max output, offered globally for free, however, an voluntary size of donation is gladly accepted to get a "free" license. Anyone can now build his very own, generator.

License should be acquired for selling generators, the inventions name "WaveReaper" should be honored, as the inventors name Stefan Nyström. Circuminvent Please, mail me a photo of your device, for educational purposes, and to help others get ideas, pictures will be promoted on this site!

Let everyone know, friend and foe, its time for things to change in the worlds energy sector. Oil based economy, is gone, lets all accept it, and build a better world, feed the hungry, cure the sick, and of course, stop polluting the environment, with the oil based stone age technology."


NGO Circuminvent

Company will be formed 2015 for sales of Wavereaper.


Nexus Magazine SCIENCE NEWS - 1506



Mr. Sven Robert Stefan Nyström?

Contact: Contact Page

Tel: +469336920 Stockholm, Sweden

Head Project Manager

Stefan Nyström Chairman of the Board Circuminvent?