Torquemax The LRK Site Deutsche Version hier Hot! LRK-kit, who is interested in ? The million dollar question: PCM or PPM ? Hello LRK fan,    To have landed here, you must already know what an LRK is - an good outside runner motor, which can run medium to large propeller without any need for gear. You can even build the motor yourself. There are a number of internet sites which describe several variations on this motor. This page is intended to deepen your understanding of the theoretical basis of the concept and to describe the necessary construction techniques. It also offers you simple design techniques for determining the windings number and propeller adjustments. Finally, it opens Ludwig Retzbach's publication to a broad public at his request. To keep the download-pagecount manageable, the article was not simply scanned in. Instead it was carefully translated into HTML. The initial report about the LRK350-20 has grown into a central LRK site. Note: under construction means most often, that the English version isn't ready yet. However you can try to read the original page in German. LRK350-20 with rotating shaft, design, realisation, measurement Why does the Torquemax rotate so slowly and so forcefully Various types of windings Animation of the rotating 14-pole outside runner How many windings does my LRK350-20 motor need? Propeller adjustment, Aeronaut propeller n100w table All three motors with 11, 13, 15 windings in test Universal constant WL for all Torquemax motors Measurements on the LRK350-20-13 in flight Measurements on small LRK350-12-24 in part load SPEEDY-BL self made brushless controller Quite new! Pictures from the Workshop References on the LRK The breezy idea of a slow outside runner motor Ludwig Retbach's articles on LRK from German periodic "elektroModell" EM 4/2000 TORQUEMAX LRK - sensorless, brushless build-it-yourself motor EM 1/2001 Build-it-yourself Motor Torquemax LRK - part 2 EM 2/2001 Brushless News about LRK (under construction) EM 3/2001 Motor fever, News on Torquemax New EM 4/2001 Performance Measurements on Electric Motors back to main page