Directory:Ettridge Wind Turbine

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Image:Ettridgewindturbine300x300 byKevn.jpg

The vertical axis Ettridge Wind Generator (EWG) by Ettridge Wind Turbine Pty. Ltd. is different from propeller wind generators in that it harnesses oncoming wind for 120 degrees of the turn, while the remaining 240 degrees is shielded by a skirt to cover the blades from oncoming wind. Meanwhile, overhead air scoops direct the air above the rotor down into the tunnel created by the rotor and wind shield, pushing onto the backside.

Ettridge Wind Turbine Pty. Ltd. claims this to be the most efficient conversion of wind power to rotary mechanical motion, enabling lower elevation installation to achieve the same level of power harnessed from the lower wind speeds there, versus a taller tower to reach the higher wind speeds, making it more suitable to urban settings.

The design itself is said to lend to simple, low-cost construction while having a lower visual profile. With the generator on ground level, maintenance costs are lower. The spinning portion of the turbine can be covered with a screen to protect animals.

John Patrick Ettridge has also developed the Gemini electric motor to work in the Ettridge Wind Generator (EWG) to increase the efficiency of the electricity generator portion of the system.

See Directory:Gemini Electric Motor

Official Websites

About the EWT Technology

FAQs - the Ettridge Wind Turbine uses a Gemini Electric

Generator. See Directory:Gemini Electric Motor

Latest Developments

Apr. 13, 2010

Hi Sterling,

I sent you the DVD on the Ettridge Wind turbine and the Gemini Electric Motor & Generator on Monday 12/04/2010 by post. It usually takes around 7 days to get to you. I am hoping that you can edit a section out of the DVD which better shows the Ettridge Wind Turbine, as the one currently used was made years ago.

On Monday I had a radio interview with Carole Whitelock on ABC radio talking about the Ettridge Wind Turbine. It lasted about 15 minutes and went very well. I have had lots of enquiries from people who want to buy them, lots of enquiries from people who want to market them. And one or two enquiries from people who want to make them overseas.

This has been my standard letter in reply to most enquiries.

: The Ettridge Wind Turbine is not available for sale at the moment. It has two problems, the first is that nobody wants to manufacture anything in Australia any more, manufacture is almost a dirty word. I have thousands of people who want to sell them, but nobody who wants to make them. They want me to finance the manufacture, then obtain all the necessary testing, state and council approvals, put it in to a box, so they can market them.

: The other problem is The Ettridge Wind Turbine is a low tech solution that delivers high tech performance, when compared with the propeller units. There is no tower, no expensive high tech propeller, no expensive gear box or speed increase system, this means that half to two third of the cost of a conventional wind turbine is not incurred or needed.

: In simple terms the Ettridge Wind Turbine uses a Directory:Gemini Electric Motor, details at: as the base of the turbine, the boss which hold the bearings is extended, and blade are fitted to the extended boss. The wind shield and overhead scoops are fitted with bushes (although this outside unit rotates to keep it pointed into the wind, it does not spin like the rotor). The only parts that touch and can wear are the bearings. The construction is basic sheet metal production, apart from the generator.

: The Ettridge Wind Turbine provides a wind turbine with a low unit cost and low visual impact. The point of production of electricity is at the place of consumption (house, factory, office, ect.) providing clean, green, pollution-free, renewable electricity cheaper than coal or other methods. The noise level is negligible. The EWT can effectively operate in high wind areas. The EWT general efficiency is excellent. Naturally, it will not work without the wind, but it has a much wider range of wind speeds in which it can operate. There is no bird kill problem. The EWT can operate in very high temperatures. The EWT does not disturb the air and has no effect on weather radar.

: If you already have a solar panel system, the EWT can use the same electronics, to send power in to the power grid, particularly at night, when there is no generation of electricity by the solar panels.

: I will update the website when they are available for sale in Australia. Regards,

: John Patrick Ettridge.

It is quite frustrating when I get so many people who want to buy them, but I can not deliver, and do not know when I will be able to? From inventors I know in the U.S.A., I take it the market in the U.S.A. is not much better.



Oct 6, 2008

It is three inventions, the Gemini Electric Motor, the Gemini Electric Generator and the Ettridge Wind Turbine. All are ready to manufacture, right now, but lack of finance prevents me from making them to final production standard. I need money for tooling to add the finishing touches.

I just tried out the Gemini Electric Motor with Neodymium permanent magnets and a new electronic controller. The old electronic controller, the one shown in the DVD (have I sent you a copy of the DVD that shows all three inventions? if not please provide me with your postal address, and I will send you one), the original controller was a DATA 710A, which went from 24 - 48 volts and a maximum of 20 amps. The new controller goes from 24 - 72 volts and up to 120 amps.

The performance is exciting, it will let me show off the Gemini Electric Motor at its best.

The Gemini Electric Generator and Ettridge Wind turbine are ready to manufacture, test and market, that take dollars, which are in short supply. I need to get some new shareholders.

August 1, 2008

Well at last some good news, the Gemini Electric Motor & Generator has been progressing steadily but slowly, usually due to lack of finance. Lack of finance is still a concern, but at last technology has caught up with us.

I have attached a DVD of the Gemini Electric Motor, and an application for the Gemini Electric Generator at the base of a wind turbine.

For those who have kept regular contact, would know that for some time I have had the Gemini Electric Motor working on a DATA 710A electronic controller which uses 12 - 48 volts and a maximum of 20 amps ( the controller is limited to 16 amps ). This controller cost around $550 and while the general performance was good, it lacked the high torque that we know the Gemini Electric Motor is capable of. I was aware of the WaveSculptor electronic controller made by TRITIUM Pty. Ltd. a Queensland company which has a maximum of 160 volts and 120 amps but cost $7,700, money we did not have, so we could not afford. Recently I became aware of the Kelly Controller which has a whole range of controllers from 24-48 volts and 50amps which cost $304, or 24-48 volts to 125 amps which cost $558 or the upper range unit with a maximum of 120 volts and a continuous current of 200 amps which cost $1,066. I have now have all three controllers to test the improved Gemini Electric Motors. The other important thing is the Gemini Electric Motor in the DVD is using grade 8 Ceramic permanent magnets, while the Gemini Electric Motor fitted with the new controller is fitted with Neodymium permanent magnets ( rare earth magnets ). The Neodymium permanent magnets are many, many, many times stronger than the Ceramic permanent magnets. The Gemini Electric Motor in the DVD is capable of 5,000 r.p.m. on 48 volts, what speed will the Gemini Electric Motor be capable of on 120 volts ?

One of the unique properties of the Gemini Electric Motor is that the magnets either side of the energized coil act to restrict the flow of current, and it is quite likely even with the new controller, it may not draw anything like the 200 amps. The New controller is capable of taking the Gemini Electric Motor up to 10,000 r.p.m. One of the things that we have been trying to achieve is use the minimum volts and minimum amps to do the job. 120 volts and 200 amps is very dangerous, and not currents that I want to deal with. 48 volts and up to 50 amps should be enough for a small car, and that is what we will be try for.

The patents in USA, UK, Germany, Japan, India and Australia are all paid up to date for another year. China, France, Spain and Italy where lost due to not paying the annual renewal fee.

How does it work?

Quoting from their website:

Image:EWG animation 300.gif

Ettridge Wind Turbine

Image:EWT animation1a 95x95.gif

The problem with the current Savonius type wind turbines is the fact that the blades are only driven by the wind for approximately 120 degrees of one rotation, that is from the direction of the oncoming wind to about 120 degree from the center, the remaining 240 degrees, the blades are actually using power, and have to be driven into the wind. The solution that I came up with was to allow the normal operation for the 120 degrees of the turn, and for the remaining 240 degrees to place a shield, or skirt to cover the blades in the area that they normally would need to be driven into the oncoming wind, and by using overhead air scoops, directed the air above the rotor down into the tunnel created by the rotor and wind shield. This has the effect that the blades on the rotating turbine are driven for the full 360 degrees, greatly improving low wind speed start up efficiency, and by rotating the skirt and scoops effectively feathering the rotor in high wind speeds. The wind shield also can be moved, to ensure the wind scoops are facing the direction of the oncoming wind, either by a wind tail or mechanical means.

The Ettridge Wind Turbine is the only Wind Turbine that can be scaled down to be suitable for use with electric powered vehicles. One of the problems with wind generators is that when there is no wind, they do not work. But of course even if there is no wind, and a vehicle is traveling at 60 km/h, then there is a 60 km/h wind or air movement over the roof of the vehicle, or through the front of the vehicle, where the radiator would have been placed, in an internal combustion powered vehicle.

[EDITOR'S NOTE: It is not clear what the inventor has in mind for such a device. Surely he doesn't think the oncoming wind could power the car (does he?).]

In the animation above, the black arrows represent the wind at the lower level moving the turbine blades in the uncovered portion of the wind shield which is attached to the wind scoop, that is about 120 degrees of rotation.

The red arrows represent the wind at the high level in the wind scoop and the tunnel formed by the wind shield and turbine blades, the remaining 240 degrees of rotation.

Naturally if the Ettridge Wind Turbine is fixed in a vehicle there is no need for the wind scoop and wind shield to be able to rotate, as the direction of the wind will always be from the front of the vehicle.



(8 seconds)

Ettridge Wind Turbine - (YouTube Oct. 5, 2008)


Ettridge Wind Turbine

The most efficient conversion of wind power to rotary mechanical motion.

Simple low cost construction.

Smaller size than comparable propeller type wind generators.

Multi uses, including automobile applications.

Low environmental visual profile.

No high towers needed, can be positioned at ground height, or roof height.

Can be screened to ensure no harm to wildlife and protected birds.

Easy Maintenance at ground level.

No high surface speeds and excessive noise

Company:Ettridge Wind Turbine Pty. Ltd.


Patent have been applied for, and other patents are pending.


In the News


Image:EWT animation1b 95x95.gif
Latest: Directory:Wind > Directory:Vertical Axis Wind Turbines > Directory:Ettridge Wind Turbine > Directory:Ettridge Wind Turbine - John Patrick Ettridge has had many inquiries about purchasing and marketing his technology, but he's not had success finding a manufacturer for his vertical axis turbine design that could be cheaper than coal power. It's attributes include low visual impact, pollution-free, negligible noise, wider range of operable wind speeds, no bird kill. (PESWiki April 13, 2010)
Image:EWT animation1a 95x95.gif
Directory:Wind > Directory:Vertical Axis Wind Turbines >Directory:Ettridge Wind Turbine - Australian inventor's turbine harnesses oncoming wind for 120 degrees of the turn, while the remaining 240 degrees is shielded by a skirt to cover the blades from oncoming wind. Meanwhile, overhead air scoops direct the air above the rotor down into the tunnel created by the rotor and wind shield. (PESWiki Oct. 5, 2008)

Other Coverage

A review by Tim Harwood is scheduled for publication in Nexus magazine.


See Talk:Directory:Ettridge Wind Turbine


Image:John Patrick Ettridge w Commutator 200.jpg
that he developed to go with the turbine.]]

John Patrick Ettridge

Ettridge Wind Turbine Pty. Ltd.

53 Branksome Terrace

Dover Gardens

South Australia 5048

Phone: 61-8-82981698

FAX: 61-8-82989080

E-Mail: []

See also

Directory:Gemini Electric Motor




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Directory:Wind:Past Developments



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Directory:High-Efficiency Horizontal Axis Wind Turbines

Directory:Home Generation:Wind Turbine

Directory:Vertical Axis Wind Turbines

Directory:High Altitude Wind Power


Directory:Wind Augmentation

Directory:Power Via Atmospheric Pressure Differences


Directory:Humdinger Windbelt



Directory:Wind Power in the United Kingdom

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