Rotating even a mild wind of utracki-pinwheels are “decoration” of many plots. Their purpose is very utilitarian and the noise of the propeller to drive away from the site of moles and other rodents, which often destroy the roots of fruit trees and shrubs. Design of petrachkov plain— hinged on a long stick wooden block-cross member, one end of which revolves a wooden or metal propeller, and the other with a plywood keel.
To make such a device not so difficult, but the area of such need not less than a dozen, and the time it will take a lot of. And is such a vetryachok no more than one season: the wood crack, crack and the propeller stops spinning.
On my site for several years now quite successfully noise of the rotary utracki that are made from literally anything— from plastic bottles and aluminum cans of carbonated beverages.
Although such utracki very easy job, however, requires known accuracy. To start, cut out of construction paper pattern-scan of the cylindrical part 2-liter bottles with the Windows — their size and location are selected depending on bottle sizes. Next, using a felt tip pen-marker on the surface of the bottle transferred the outlines of the Windows in their corners hot wire propellets hole, then with sharp scissors on three sides of each window are made of the slot. It remains to fold the “fold” at 30-40 degrees and vetryachok-rotor ready.