The fourth is unnecessary

Triada-350 trike: IZH-Yu-5 engine, frame, chassis, foam body

The proverb usually mentions a fifth wheel. However, some car designers use a formula reflected in the title of our article. They really do consider the fourth wheel on a car redundant. Judge for yourself: unlike a four-legged stool, a three-legged one does not rock even on uneven ground (remember from school: through three points Read more…

Foot-powered shower

Portable dacha shower with foot membrane pump

It is intended for dacha and garden cabins and can also be used in field conditions. The design was approved by everyone who used it for several years. A typical dacha shower is usually a booth on a frame of four posts with a water tank on top. Because of its weight, such a fixed Read more…

Air-cushion boat / hovercraft

RC airboat hydroglider 2.5 cm3: design and assembly guide

Building and tuning an airboat hydroglider is much easier (and cheaper) than building a racing boat model with a propeller, gearbox, and liquid-cooled engine. At the same time, if properly designed, it is practically not inferior to the “classic” setup in either speed or maneuverability. The proposed radio-controlled model with an air propulsor is based Read more…

Car lift in the garage

DIY ceiling garage hoist crane: boom, winch, trolley

When I bought a used passenger car and started repairing it, my first helper in the garage became… a hoist I built under the ceiling. Without it I would hardly have managed, for example, such a difficult operation to do alone as replacing the engine. Figure 1 shows the hoist placement in the garage — Read more…

We reinvented the bicycle!

Velokult-2025: custom bikes, e-mopeds, wooden racer builds

In April, the individual transport exhibition “Velokult-2025” took place. The most exotic exhibits greeted visitors on the open area at the pavilion entrance. They were demonstrated by enthusiasts from the “Velotsirk” group. Dozens of specimens—and not a single one like another! Moreover, anyone could take a ride on each of them, which delighted visitors. Some Read more…

Gym in your bedroom

Sports wall-bed: compact home gym that saves space

“Hypodynamia, old age, and shortness of breath…” — so goes a well-known song. Indeed, in our age of widespread mechanization and computerization, the question of maintaining an active lifestyle is very acute. The way out is physical culture and sports. That is why mini sports complexes and home exercise corners are becoming familiar in our Read more…

Mast without secrets

Sailboat mast: choice, design, and mainsail attachment guide

The mast is the foundation of the rig of any sailing tourist or sports craft, its most important unit. Its design and position determine sail area, configuration and aerodynamics, the ability to adjust sail thrust, and the design of the centerboard and the “ship” as a whole. When building a small sailboat, you have to Read more…

“Shmel” glider-gyroplane

Shmel micro autogyro: Vzlet OKB upgrades and flight tests

When designing and building the “Shmel,” the creative team “Vzlet” took as a basis the micro autogyro designed by V. Barkovsky, V. Vinitsky, and Yu. Rysyuk, described in detail in “M-K” (see: 1969, No. 6; 1970, Nos. 3 and 10; and 1971, No. 6). This very well-made machine, the first in our country of its Read more…