Paul Klassen,





: outer wings drawn in Autocad.


: 10m2 GMWT draft


: IMPORTANT:  The position of inner blades (i.e.DARRIEUS) inside the outer wings (AADW=Augmentation And Directioning Wings). (Please be noticed the exact position of DARR. blade.)


: General view of AADW wings.


: exact self directioning principle. Please notice the wind direction, nearest escape side of the DARR.  blade and center of turbine are in the same single  line.


: succecfull augmentation principle. How it works. Pleas notice wake field back of the rear wing.


: angle of attack for DARR. Blades. We always made this angle as zero.  Try up to minus 2 degree.


: calculation for centrifugal force for DARR. Blades. (If necessary)


: some coordinates for DARR. Blades (i.e: NACA, 0010, 0015, 0018, 0021, 0032) We always made blades of NACA 021 profiles.


: IMPORTANT: Relation with the chord length of DARR. Blades and the total diameter of turbine (i.e:  appr. the inner diameter of AADW blades). Please notice that the sample VAWT turbine is DOE SANDIA vawt (USA) turbine, and this ratio is found as, 3,68%.    This rounded 4%.(MAX.)   This means 4=CHORD OF DARRIEUS BLADE and 100=Inner diameter of turbine, here this means the inner diameter of AADW wings. VERY IMPORTANT : We recommend you not to exceed this limit  (% 4 - 4,5 ).


Otherwise, turbine become some russian giromill (cyclogiro) turbine such as “much chord of Darrieus, less total diameter” !!!!! . This is wrong aerodynamically.


: here are some russian samples. Please notice the ice problems.


: some construction examples in draft of AADW wings.


: the inner and outer diameters of AADW wings. (as a sample in draft)


: another draft: the inner and outer diameters of AADW wings. (as a sample in draft)


: the exact position of DARR. Blades inside the AADW wing. (IMPORTANT)




: Dimensions principle: please calculate specific ratio for every diameters you may request.



: GMWT animation: The dimensions are completely realistic. Please enlarge drawing as much as possible and copy with a convenient browser (i.e. SLIMBROWSER)


: details of a working model of GMWT


: NACA 0021 coordinates


: AADW wing coordinates : vertex points




Dear Paul,




Please consider to contruct the AADW wings rather strong. Do not afraid the heavy weigth of it. And their connection arms to the main turbine must be very strong, because there exist strong lift and drag powers generated. My recommendation for these arms is using U or H shaped stell arms with 90 degrees among vertical and horizontal angles.




DARRIEUS blades must be rather light but rigit in construction.




Both DARR. Blades and ADDW wings are not allowed to be spoiled their original shapes during the operation, thus bending or curving of them are not allowed. This is very important, otherwise, some aerodynamic troubles occured.




You will see during operation of your GMWT  turbine that there is not necessary start-up power for cut-in of DARR blades, comparing as to obtain very important advantage against VAWTs.




More, you can easily adjust the RPM of DARR blades while changing the correct direction to the wind with sligth differences of correct angles to the wind. This can be adjusted without much power with a simple step more attached to the AADW main construction.




Please be adviced that a brake for DARR blades may be convenient for the full stop.




Please inform me the results. It wil be a great pleasure for me to help you, and having information in progress of your own on this geometry of GMWT. You may freely raise the flag of it to your own success. My only request is to hear from you.




In need of Turkish translation please inform me.




I hope all the contained data will be helpfull to your operation. I am freely available for all technical discussions for your success.






Best regards,




Yavuz Ali ̃ener





























 Paul Klassen []