Sail is one of the oldest inventions of mankind, who played a revolutionary role in the development of navigation. The Millennium operation has made sailing propulsion is very perfect, and it seemed that his aerodynamic abilities reached its practical and theoretical limit. A new stage of development of this propulsion system uses the wind power, was the creation of a rigid sail with double-sided sheathing.
In recent years, Amateur designers snowmobiles somehow forgotten about the ski-tracked vehicle whose design is thoroughly worked out by dozens of manufacturers in hundreds of models, and prefer a more simple and universal to all-terrain vehicles on low pressure tires. However, from time to time enthusiasts snowmobile equipment design and classic motonarty, creating a simple and functional design. A typical example is the ski-track snowmobile “Polar wolf”, designed by Igor Galkin.
The unenviable fate of people unable to move on their own. Simplifies their lives only a specialized vehicle — a wheelchair. It allows to drive up to the bookshelf or the window, go to the balcony, finally, just to stretch my muscles. Of course, you can buy a modern wheelchair factory production. However, I think it is not affordable for everyone. And especially the disabled.
In gardens and orchards, dachas and school grounds — wherever there is a need to treat a small area of land, widely use universal blocks (UMB). Including homemade, are often created with maximum use of standard components and parts. One of these structures was developed and successfully tested in the case of members Ceadir-Lunga syut under the leadership of Vladimir Konstantinov.
