This relative rotational movement of crank handle 7 in relation to crank arms 6 is converted into backward and forward radial movement of crank arm 6, which causes the extremity of arm 6 that is connected to the rear section of blade 2 to follow {HEAD ~ an elliptical orbital path} around {TAIL ~ turbine axle} 4 
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This relative rotational movement of crank handle 7 in relation to crank arms 6 is converted into backward and forward radial movement of crank arm 6 , which causes the extremity of arm 6 that is connected to the rear section of blade 2 to follow { HEAD ~ an elliptical orbital path } around { TAIL ~ turbine axle } 4
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