“Not long ago, the chief engineer of one of the factories producing refrigerators, V. V. Ulyanovsky, called me. As it turned out, he was interested in the thermostat I built for storing potatoes on the balcony in winter.” This is how engineer-builder A. A. Rozhdestvensky somewhat unexpectedly began presenting his mini-vegetable storage. Then he showed Read more…
It all started when we—a young childless couple—bought two “Kama” bikes and got into cycling. When our daughter was born, we faced the question: how could we all ride together? I made a small seat and mounted it on the rear rack. It served us faithfully for several years. But as our daughter grew, the Read more…
Is it not tempting to build a motorized plow whose construction has almost no welded joints! That is why the article “At the wheel of a veloplow” published in “M-K” No. 3, 1985—on how to build such a mechanism using the frame of a worn-out bicycle—drew a wide response. However, many letters received by the Read more…
The journal has already reported on the advantages of rotary valve gas distribution in two-stroke internal combustion engines («M-K» No. 11 for 1974 and No. 10 for 1977). Here are their advantages in brief: achieving the highest specific power and fuel economy of the engine, improving starting and simplifying the cylinder design (no intake ports Read more…
This powered paraglider (such craft are now more often called paramotors), developed at the design bureau of the “Eureka” amateur technical creativity club in the village of Torga, Yakutia, was named “Carlson-4”. The number in its name clearly indicates that this is the fourth variant of such an aircraft. Since 1985 we have accumulated considerable Read more…
Camber and toe-in of a passenger car’s wheels can be adjusted very accurately without going to a service station. You only need some basic metalworking skills and simple tools to make your own set of devices for this adjustment—simple and convenient to use. Consider as an example the VAZ 21063. The distance between the centres Read more…
Training on the simulator is part of a complex of organizational, methodological and technical measures of the Kaunas Hang Gliding Sports and Technical Club DOSAAF, aimed at improving flight safety, and is designed to master the skills of controlling hang gliders of any class. *** The design of the simulator is based on a device Read more…
At first, like most beginner radio amateurs, I drilled the mounting holes in printed circuit boards with a universal tool — an electric hand drill. However, it turned out that for making small holes (less than 3 mm in diameter) and with high accuracy, a hand drill is a poor assistant. After breaking quite a Read more…
This device helps detect hidden large metal objects at depths up to 0.6 m. It is needed by builders, gas service workers, and utility workers to search for metal manholes and covers that, during building construction or street reconstruction, ended up under a layer of earth, asphalt, or were covered by sand. With a metal Read more…
Whatever is planted on a garden plot—flowers, vegetables, shrubs, or fruit trees—every plant needs regular, and often heavy and prolonged watering. A simple device, successfully tested by me and serving reliably for more than one season, makes this job much easier. It is a kind of mini-irrigation system consisting of a plastic portable water supply Read more…
