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>>> to open the list of publications, please click HERE.
1981 Workers Institute Soltau "Wind energy converters" Participants DIY- and generally interested persons. How to build your own wind generator, with special emphasis on rewinding and connecting generators (German)
1984 "Measurements on 12 Wind Energy Converters" Part 1 of the final report of the research project "Survey and evaluation wind energy converters in the Federal Republic of Germany", Project No. BMFT 323-4003-03-E 8145A7 (German)
1984 EWEC Hamburg, Walter Stephenson, Georg Böhmeke " Inventory and Evaluation of Experience made with WEC in Western Germany" (English)
Sept. 1991 Helsinki University of Technology (HUT)"Wind energy and wind energy converters" (English) Oral presentation for students, general overview.
10 - 13 Febr. 1992, Hetta. "Icing test and rework of WECS for use on Lapland's fjells" (English) Böhmeke, Georg; Peltola, Esa Boreas North Wind - Pohjatuuli. Nemo; Ilmatieteen laitos; VTT. Hetta (1992), 219 - 232
1992 "Wind power plants in the weather conditions of Northern Finland" (English) Böhmeke, Georg. VTT, Espoo. 86 p. + app. 8 p. VTT Research Notes : 1354 (Also video of an ice accretion, taken with a rotating camera fixed to a blade)
14 - 18 Oct. 1991. "Development of wind technology for the Finnish climate" (English) Böhmeke, Georg. Wind Energy: Technology and Implementation Proceedings of Amsterdam Ewec '91. EWEA/NEWIN. Amsterdam (1991), 114 - 117
24 - 27 Sept. 1991. Exhibition poster (English) Böhmeke, Georg; Makkonen, Lasse; Walsh, Marcus Wind Power '91. Palm Springs, CA, USA. American Wind Energy Association, U.S. Department of Energy. USA (1991), 8 p.
12.12.1995 Oral presentation “Design methods for wind energy converters”, Fachhochschule Lübeck. Overview what design tools and calculation methods are used in WEC design. Audience: Students. In 1995 the theoretical background for dimensioning wind turbines was strongly growing. Some milestones: Around 1991 turbulence modeling was implemented, ca 1994 used for fatigue.

1992-93 the use of three independent pitches as safety system came up.

Later 1997 the safety supervisions were enlarged to cover "sabotage" load cases, in which the operation control computer caused pitch runaway or similar events.

Today the IEC61400-3 is so complicated that you need a special calculation engineer who does nothing else.

In order to give the young students an overview over the "state of the art", I wrote this paper 1995 and presented it in the Fachhochschule Lübeck.

>>> The link to the presentation (German).
1997 EWEC Dublin. Böhmeke, Boldt, Beneke "Direct drive, geared drive, intermediate solutions - comparison of design features and operating economics" Basics of the Multibrid-concept and comparison with conventional drives. The very first introduction of the slow-speed concept prior to the commercial phase. Aerodyn was interested, which concept will win, Direct Drive, Geared Drive, or whatsoever other solution. As we could rather quickly exclude hydraulic gears, we concentrated on the question of gear ratio. It was my project and task to work out feasibility and economy. In Dublin I presented the results for a 1.5MW machine.

The medium-speed solution I called "Hybrid". Based on the size of 1.5MW and with the typical techniques of that time, the medium-speed solution did not have distinct advantages.

When I came home from Dublin we discussed the matter once more internally in AERODYN, and we added aspects such as O&M, probability statistics of damages, transport. It was found that the medium-speed concept had clear advantages for turbines of high reliability and large size.

The solution was called MULTIBRID from MULTImegawatt and hyBRID. Aerodyn filed patents and a trademark. In the first patents you can find my name. From then on I have been actively involved in pushing the concept, at first in Germany, later in Finland.

You find the MULTIBRID concept in the wind turbines of Winwind OY and also in my SHI 7-172. It has been adopted by many more companies.

>>> The links to the jpg-files (English): | 1 | 2 | 3 | 4 | .
4.5.1999 "Introduction to wind energy" Oral presentation. Audience: Managers of the energy business, the event organized by the utility Pohjolan Voima OY A contribution to an internal seminar of PVO Pohjolan Voima, who started to become interested in wind power in 1999.

PVO operates conventional power plants and aims at supplying cheap energy to its customers.

My presentation was a basis for my own job, as I worked at PVO-Engineering for more than a year until we founded WINWIND OY as a spin-off in 2001.

The WWD1 was at first named the PVOE-1000 but naturally, a utility cannot start to manufacture wind turbines. They can procure wind turbines and operate a wind farm, or even one level higher, just buy wind power and distribute it.

The spin-off was more or less visible already in 1999 and happened in 2001 with the foundation of Winwind. This company I supported as technical director from the first day on.

>>> The link to the presentation (English) .
25.3.2000 Oral presentation "Simplified load assumption calculations and related safety equipment", Audience: DIYers and generally interested people. Organizer: Finnish Wind Energy Association. People who make their own wind turbine in their backyard are from my viewpoint a contradiction. If the turbine is silent, neat and works well, it might generate energy and good reputation. Unfortunately, the risk is large that the work is done rather spontaneously without calculations and the wind turbine breaks down.

In this moment the matter is more than just a private affair. If someone dies by his own DIY wind turbine, it will stop many commercial wind turbine projects through public opposition.

So, since 1982 I push the DIY people towards making correct safety systems and calculating at least roughly the loads in operation and storm. A good basis is the "Simplified load assumptions" of the old GL rules from 1989. It was meant for DIY or small handworkers who did not have money to subcontract a professional consultant.

I think I made this presentation in German and someone translated it to Finnish. In 1999 I was not yet fluent enough to present such matters in Finnish language.

Maybe my work has saved one or two DIY turbines from collapsing in a storm?

Different from Germany, in Finland 99% of all DIY wind turbines are junk, made of junk and either break down in every storm, or they are being changed by the builder himself, who has got a brand-new idea. So I felt constantly decreasing motivation to support DIY activities.

>>> The link to the presentation (German) .
Article in the journal VINDÖGAT, Spring 2000 "Gearbox damage - why?" Explanation of the most important damage mechanisms and design measures (Original German, published in Swedish) Insider knowhow about gearboxes, status 2000.

I have listed all known and obvious reasons for the large gearbox damage wave which hit Europe from ca 1997 to 2005.

Resumed, it was the own incompetence of the wind turbine branch. The Swedish text was unfortunately lost.

>>> The link to the presentation (English)
>>> The link to the presentation (German)
>>> The link to the presentation (Finnish)
Article in the journal TUULENSILMÄ "Development Tendencies in the Wind Power Branch" February 2000. Market and technology tendencies, forecast. In Finland there has been a small pro-windpower community, starting from the swedish-speaking Vindkraft-Förening rf since about 1980, the golden age of the eco movement. A small insider journal VINDÖGAT was published, followed by the Finnish analogue TUULENSILMÄ.

According to internet infos, in 2013 there are far more people organized against wind power than in favour of it.

>>> The link to the presentation (Finnish)
>>> The link to the presentation (German)
DEWEK 2000 Poster "Minimizing the yaw loads by optimized slip brake torque control" (German) The ideas were realized in the WWD machines and also implemented into the Samsung 7MW turbine. This is one of my few scientific presentations. I had worked weeks on the matter with all kind of load classifications and simulations, before I could generate the poster.

The poster describes a method of yawing, using a yaw pressure of exactly what is necessary to keep the machine free from backlash. This is a very often practiced method and implemented in all WWD machines.

Prerequisite is a stickslip-free brake pad, which may slip.

The same method is now used for the SHI 7-172 offshore machine.

Already in this poster publication from 2000 I clearly mention the use of a closed loop control to adjust the brake pressure to come close to falling loose.

Afterwards some companies tried to patent this item. Based on the fact that I have published the matter, the patents can be attacked.

>>> The link to the presentation (German)
Exhibition and Fair "Energy" in Tampere 19.10.2000. Oral presentation "Wind Energy Converter Concepts", Audience: Engineers from the energy branch. Presentation as a windpower missionary in Finland in the year 2000.

There were about 50 attendants, mostly electrical engineers from whatsoever "normal" company, and slightly interested in hearing about wind power.

As Finland is politically on a strict nuclear course, there were people arguing after my presentation, that wind power is nonsense, kills the birds, makes noise, disturbs TV etc etc.

I simply avoided such basic discussions by replying: I just tell you about windpower engineering, not windpower in energy politics.

>>> The link to the presentation (Finnish)
Exhibition 6.-8. February 2002 "Electricity, Telephone, Light and Sound", Jyväskylä. Oral presentation "Concepts and Components of Variable-Speed Drives of Wind Energy Converters" (Finnish). Audience: Mostly Electrical Engineers. Introducing wind power to non-wind people from the branch of electrical engineering and construction.

Basic facts with discussion afterwards. Nothing really special. Again I avoided to dispute the ecologic benefit of windpower and concentrated on technics.

>>> The link to the presentation (Finnish)
>>> Link to the "basic concepts" (Finnish)
23.10.2002 HUT Helsinki University of Technology "Wind Energy Converters" Overview over all technical and economical issues (Finnish). Audience: Students of Physics or Energy-related subjects.
EWEC 2003 Madrid, oral presentation: "Development and operational experience of the wind energy converter WWD-1" The EWEC is mostly scientific but a small slot is permitted to introduce new technical developments. Of course, this is a bit of propaganda, but also interesting if new machines appear on the market.

The content of my presentation is not scientific or high-tech. It just describes the WWD1 with an outlook to the WWD3, which was under design. In that time, a tight cooperation with the MULTIBRID was planned but slept away later.

>>> The link to the presentation (English)
11.11.2003 HUT Helsinki University of Technology "Operation Control, Supervision and Safety Devices of Wind Energy Converters" Audience: Students of Mechanical Engineering. The room was full and the audience listened carefully.

It was reporting about safety philosophy, safety electrics, supervisions, official requirements, weak spots in safety systems.

The students were interested and I enjoyed the good reception of my points.

>>> The link to the text (Finnish)
>>> The link to the Power Point presentation (Finnish)
EWEC 2004 London, Poster "Development of the WWD3 Wind Energy Converter" I had announced the poster under NEW DEVELOMENTS.

To my surprise I found it under MEASUREMENTS far away from the center of the exhibition, somewhere hidden among least interesting posters.

>>> The link to the presentation (English)
>>> The link to the photos (English)
April 2005 Oral presentation (3h) "Design and manufacture of rotor blades" The state research center VTT asked me to make a lesson on rotor blades. It was used as a seminar lesson, so the students had to come to get their confirmation receipt.

It gives an overview for newcomers, who are so far not experts of composites.

In 2006 a delegation of Chinese people came, they were from ventilator companies and interested in rotor blades as a possible enlargement of their product families.

Presently the whole PPT is a bit out-dated and I don't dare presenting it any more without making new and interesting additions.

>>> The link to the 1st version (Finnish)
>>> The link to the 2nd version (Finnish)
>>> The link to the 1st version (English)
>>> The link to the 2nd version (English)
>>> Vocabulary (English, German, Finnish)
April 2006 Same presentation, but in english. Audience: Students of different subjects related to energy generation and conversion.
5.4.2006 "Design Philosophy and Market Aims of WINWIND", contribution to a publication of company Oevermöhle, Germany. Presentation of the design aims, which are behind the philosophy of the WWD 1 and WWD 3.

The claimed technical advantages are largely true, but WWD managed to ruin their own products and reputation by themselves.

Although having been technical director and father of the products, I do not take any responsibility for the technical consequences of a general mismanagement.

>>> The link to the presentation (English)
>>> The link to the presentation (German)
16.4.2010 “Windpower Concepts and Tendencies”, oral presentation in course of the seminar “Tuulivoima tutuksi” (Come to know the wind power) organized by VTT and TKK The state research center VTT made together with the university a seminar, held in the University campus Otaniemi. I was asked to make a short presentation on windpower.

So I shortly gave a resume of the wind power branch development (which the newbies had missed) and added an explanation of the most modern development trend (which the newbies had not yet understood).

It is state of the art of 2010, today we are a step further, this has to be kept in mind.

>>> The link to the presentation (Finnish)
>>> The link to the presentation (English)
22-23.10.2012 Chairman of a conference on drive trains in Bremen, Germany, organized by IQPC. Own presentation on structure born noise issues on gearboxes (all in English).
21.2.2013 Presentation on the 5 years anniversary of WINDNOVATION, "From the homemade windmills of the 1970ties to present high-tech developments", one hour, german language. Audience mostly engineers from aircraft, rotorblades, composites. We need to see the situation as it is, and not as we would like it to be.

My presentation for the 5 years anniversary of WINDNOVATION puts the real points on the table.

Written in a bit freaky and funny style, it is right for a party.

Anyhow my PPT shows, where the crucial points of wind power presently are.

It is irresponsible of EWEA and other organizations to tell us stories about 40'000 needed skilled wind power experts, when about 10'000 have just been laid off in Europe, with rapidly growing tendency. It is equally irresponsible of the Universities and high schools to train young engineers as wind power engineers, when everybody knows that they will not find a job in the next 5 years.

>>> The link to the presentation (German)