Some models of the bicycle electric generator, better known as a “dynamo,” have serious design flaws. For example, the plain bearings in which the rotor shaft rotates need periodic lubrication. And their design is inconvenient to disassemble. Once the lubricant is depleted, increased friction appears, along with wear of the bearing bushings and of the Read more…
The proposed design is a five-section three-seat boat with a carrying capacity of 320 kg. On tourist trips, once hauled ashore, it turns into a fairly spacious “tent,” especially if a piece of polyethylene film is thrown over the top. The boat is so simple that even a person unfamiliar with boatbuilding and having only Read more…
When designing this all-terrain vehicle, amateur designer L. Antokhov from the town of Kirishi in the Ryazan Region aimed to create an all-season, reliable and highly traversable machine with small dimensions and mass, fitted with a closed cabin for three people — a driver and two passengers. The result of the work was an ATV Read more…
Submersible vibration electric pumps “Malysh” and “Rucheek” are a common choice for autonomous water-supply systems of small households, including farms. They are compact, convenient to operate, and reasonably priced. But there is a problem: such pumps cannot cope with subzero temperatures. When the pump is switched off in winter, water is trapped in the supply Read more…
that we invite you to build are quite safe and stable, despite having a single runner. The basis of the design is a spruce or pine board measuring 40X300X650 mm. It is even better to take several boards 30—35 mm thick, joint them to each other and glue them together, applying plywood cheeks (4—6 mm Read more…
Thrifty householders have always had a tradition of putting up various pickles and jams for the winter, and today it is especially relevant: food prices rise, while purchasing power lags behind. At the same time the country is experiencing a dacha boom, and plots are filled with plantings, greenhouses, fruit trees, and berry bushes. The Read more…
It is never superfluous to have in your own car, in addition to the cigarette lighter socket, also a service connector adapted for USB or even miniUSB. Such adapters come in handy in many cases, for example for powering PC peripherals, charging mobile phones, event video recorders, and everything that is designed to be powered Read more…
In one of the episodes of the Central Television program “You Can Do It” (“Eto vy mozhete”), viewers met the amateur designer Oleg Andreevich Ostapenko. We have already grown used to the fact that “EVM” introduces us to people whose technical creativity invariably arouses interest and surprises us with unexpected solutions to various design problems. Read more…
The tram is one of the oldest modes of transport in Milan. Cars of several generations operate in this city. Alongside the most modern ones, Series 1500 trams built back in the 1920s still work here. And these are not isolated specimens — more than a hundred veterans enter regular service every day. As in Read more…
The last pre-dreadnoughts of the Second Reich received the names “Deutschland”, “Pommern”, “Hannover”, “Schleswig-Holstein” and “Schlesien” — when ordered they were listed as N, O, P, Q and R respectively. Ship Q was built in Kiel by Krupp’s Germaniawerft; she was laid down on 18 August 1905 (yard number 113) and launched with ceremony on Read more…
