Many people keep various pets, and spending time with them brings plenty of pleasant moments to both children and adults. However, there are also animals that constantly live near humans and often visit their homes (for example, mice and rats). Yet they are uninvited and even harmful guests, since they are considered (and, probably, not Read more…
Prepared cement mortar needs constant mixing, otherwise it hardens quickly. But that is easier said than done; doing this work by hand is extremely tiring — it is hard to lift a shovel full of mortar. How can one try to use one’s strength more efficiently? That is how this labor-saving device appeared in my Read more…
For many years I have been a regular subscriber to “M-K” and find in it a great deal that is interesting and useful. I hope my experience will also be of use to other readers: I want to share my thoughts and practical recommendations on making and operating a tandem bicycle. I built such a Read more…
It is no exaggeration to say that the most important part of a glider-autogyro is the rotor. The autogyro’s flight qualities depend on the correctness of its airfoil, on mass, centering accuracy, and strength. True, the unpowered craft on a car tow rises only to 20–30 m. But even flight at such a height requires Read more…
For almost twenty years, a design club for agricultural modeling has been operating at the Chernihiv regional Station of Young Technicians. Over the years, the students, under the guidance of their mentors, have developed and built many useful machines, mechanisms, and devices, many of which are of practical economic importance and bring real benefit to Read more…
For more than a decade G. Malakhov has worked as the chief mechanic of the tool shop at one of Moscow’s aviation plants. But he has spent even more time (since the age of 13) on amateur technical creativity, without which he cannot imagine his present or his future at all. His record includes aerosleds, Read more…
Ecology and environmental protection are becoming increasingly relevant topics worldwide. Requirements for harmful emissions from vehicles are constantly being tightened. That is why major manufacturers are developing and starting to produce electric and hybrid cars. These trends are also reaching our country. And while the evolutionary direction of automotive development has been defined and is Read more…
On the spot where I planned to build a swimming pool near a country house there used to be an old pond that once served both as a fire reservoir and as a place for domestic geese and ducks to roam. But time passed: for firefighting needs there is now a water supply, and the Read more…
The bicycle is probably the most widespread means of transport. And there is no doubt that it is also the most economical: two buttered sandwiches are enough to pedal for two hours. But can the efficiency of the human “engine” be increased? Reducing “fuel” consumption will not help. Friction and the weight of the machine Read more…
It would seem that driving a nail is about as simple as it gets. Still, even this seemingly straightforward operation requires a calculated approach and some experience. 1. Long nails are best driven with a 400—500 g hammer, and small ones with a hammer weighing up to 250 g. 2. To find nails driven deep Read more…
