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News and media ► News archive ► Media room

News archive - 2009

News bulletin: New developments are unfolding daily! 25 November 2009

To keep up with all the latest developments, please join us on Facebook and follow us on Twitter!

News bulletin: FREE investment pack launched – 9 September 2009

Funding is urgently sought to bring the wind turbine to market.

We have internationally patented technology and firm orders but need to finalise the R&D programme, which will take less than a year with some investment.

News bulletin: Luethi Enterprises shortlisted for 2009 British Engineering Excellence Awards (BEEA) – 1 September 2009

Luethi Enterprises is shortlisted for Start Up of the Year Award in the British Engineering Excellence Awards. Read our media release here.

The winners will be announced at London's Globe Theatre on 1 October 2009.

News bulletin: Field testing of Silent Wind Turbine yields performance data – May 2009

The field testing programme at SEEDA’s site at Chatham Maritime has allowed for significant progress to be made in the Silent Wind Turbine’s development.

Firstly, Luethi Enterprises were able to test the old blade shape and new blade shape side-by-side. This revealed that the new blade shape provides significantly more power with an even lower start-up speed.

This movie clip shows just how much more efficient the new blades are compared to the previous design. The wind speed was very low when we took this movie: just 1.7 m/s! An electrical current was being generated, even at that low speed.

(The movie clip is 19 seconds; 1.2MB, WMV format.)

Secondly, we were able to undertake field testing on the curved blades and their configuration. Previous wind tunnel tests were inconclusive, as wind tunnels produce wind from a constant direction. In the real world, the wind is constantly oscillating and this affects the turbine’s performance. Being able to test these important factors in the field allowed us to refine the curves of the blade, and we also ascertained that a five-blade configuration provides more torque, and therefore more power output than three blades.

As a result of these findings, a new prototype 500W DC micro wind turbine prototype was built and then spent a number of months undergoing field testing at the SEEDA site at Chatham Maritime.

This yielded the following results:

Startup Wind Speed: 3.5m/s = 8.1mph or 13km/h or 7 Knots
4.2m/s (10mph) = 50 rpm producing 10VDC =130W
8.3m/s (19mph) = 100 rpm producing 20V DC = 260W
13.1m/s (30mph) = 150 rpm producing 28V DC = 360W
18.5m/s (42mph) = 200 rpm producing 36V DC = 470W
22 m/s to 35 m/s = (50 mph to 80 mph) producing 38V = 500W

Size of this model: 900mm wide; 1000mm tall

Weight (Including 1000mm mast): 65kg

Above: Field testing of the latest prototype of the 500W DC silent wind turbine at Chatham Maritime. The prototype in the photo above has moulded fibre-glass blades.

News bulletin: Wind-powered water pump model built – March 2009

Luethi Enterprises Ltd has been receiving numerous requests from around the world for a wind-powered water pump that's reliable and cost-effective.

A basic model has been built, revealing that the Silent Wind Turbine by Luethi Enterprises is an ideal solution. Such a pump would benefit drought-ridden countries as well as fisheries and aquatic centres needing to aerate their ponds.

To bring this to market, the wind turbine project requires funding to finalise the R&D programme. To receive an obligation-free information pack via email, please email us.

Go to the 2008 news archive.

A brief timeline and history of the silent wind turbine can be read here.

Creating new and alternative solutions in energy production

Luethi Enterprises Limited Email: info@silentwindturbine.com Phone: +44 (0) 1634 711 179

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