The editors have received many letters on the publication of “Biogas: and warms, and cooks” (see “M-K” № 1, 1987), based on the materials of the Romanian journal “Technium”. Of readers was attracted by the subject and documented in the design. Many are interested in the details of the devices bostanova, asking how to make the individual nodes. Further clarification and recommendations for possible solutions to the structural elements gives our consultant engineer P. Zach.
The design sports a model rocket with a streamer class Б6А traditional. Athletes rocketmodeler repeatedly noted that models in this class closer to a kind of optimum. Now much depends on the quality of manufacture and Assembly of their components. The proposed model is performed based on these requirements, can show good results in competitions.
For his bike, I chose a folding bike “Desna-2” In model-849 with smaller wheels (20 X 1.75). To install it on the motor, did some fine-tuning.
The laboratory experimental machines Orlowski city Palace of pioneers named after Yuri Gagarin a lot of interesting and original works. At the regional exhibitions NTTM they attract the attention of visitors of all ages. And no wonder! The search range of the young designers wide: training glider and walking robot, a flying car and microtracker. With every new car the guys are in the way of true researchers: outlining the purpose, carefully studying the existing experience, then, given their own capabilities, define the technical requirements to future design and finally design and build it. So was born a twin recumbent LEM-05 (laboratory of experimental machines, 5-I model), the creation of the device, which says the head of the laboratory of engineer V. I. Borodec.
How much fun gives the children the winter snow. Technical Arsenal of this kind of leisure is increasing every year: the sled wide variety of designs, snow-cats, snowmobiles and many others. With the arrival of spring comes the turn of wheeled transport: bicycles, scooters, skateboards. Those who are fond of snow, making myself a summer toboggan — a simple wooden cart on wheels-bearings. With a roar they rush downhill on asphalt tracks. And well, if this alignment is away from the city streets, bustling sidewalk, where the “rider” on his own, devoid of brakes the projectile is not exposed to danger. But better not to hope in case, and try to make it fun safe and useful: to make a simple single truck with steering and brakes, comfortable and safe route and organize sports competitions.
What a pleasure to start the thread right under the clouds even a simple crossing of two strips, covered with tissue paper! But in our time it is available only to inhabitants of rural areas… Try to catch a good steady wind at the site, surrounded on all four sides by a fence of high-rise homes! And try to bring a fragile product to the nearest Park in the crush of urban transport it is almost hopeless.
In Latin language the word “cultivation” means “handling”, “cultivation”. If to explain in more detail, is the process of loosening the previously treated soil with simultaneous cutting of the root system of weeds. But cultivation is not only important for weed control. Tillage improves air and water regimes of the soil, which in turn enhances the activity of soil Microorganisms, creates the conditions for a friendly germination of seeds of cultural plants.
“Look through with great interest your section on “Small machines”: many useful find here Amateur gardeners. I decided to share a simple tool that has served me faithfully for years is terebilo for corn cobs”.
The release of carbon dioxide industry miniature engines has caused many young technicians ‘ interest in the models in which you can use this reliable, silent, environmentally friendly motor. In the “M-K” have already talked about a few simple ship models with such engines. Today we offer you to make simple model airplane motor CO2. By construction, this classic high set scheme, made without the use of scarce balsa wood — mostly pine and light lime. The fuselage of the model are collected from pine spars a cross section of 2X2 mm and cross-beams of the same section. The Assembly is the simplest slipway, made of two sheets of plywood, covered with plastic wrap — so that the workpiece is not glued to the slipway. Build order is as follows: the rack-bars fixed with pins, then cut between the frame crossmember and finally the joints fill with epoxy glue so that between the blanks formed a fillet — a fillet transition. Billet spars are pre-bent over a candle flame. First, it makes sense to applied to the wall side of the fuselage, and then collect from half of spatial farm. Please note that the front spars of the fuselage together reinforced frame — lime plate thickness of 3 mm, it also serves as the basis for the engine mounts. The front part of the fuselage top and bottom (bottom to the rear edge of the wing and top to the front) paste over fake veneer thickness of 1 mm.
Everyone is used to what is required for forming the matrix and punch. In many cases, however, can do without the surround matrix — sufficient and shaped holes in sheet metal or plywood. But without the surround of the punch!..