Bow River Alberta

In March 1940, A. Antonov, who worked at the factory number 23 in Leningrad, was charged with developing an analogue of the German light aircraft Fizeler Fi.156. Working on the analog, which received the designation "aircraft number 2" (EYE-38), Antonov proposed a on the basis of its military cargo "plane number 4," distinguishing features of which were radial engine M-62 light fuselage and biplane cellule. Then rejected the idea of military aircraft, biplanes, but after the war Antonov returned to it again. In 1945, the OK Antonov, the deputy chief designer of OKB-115, addressed the Yakovlev aircraft design with a proposal of his own design and received his consent. The project "aircraft 4 "has been completely redesigned.

From the previous project there was only a biplane box. In March 1946, the Novosibirsk branch of OKB-115 was transformed into an independent OKB-153. Its chief designer was appointed Oleg Antonov. Main task was to develop new CB transport aircraft "T" with a motor-62IR. Developed in parallel with the agricultural version of the engine AL-21. The first prototype, designated Cxa, was built in 1947. August 31, 1947 test pilot AP Volodin first raised it in the sky. In December, the Air Force Institute began its state tests, which lasted until March 1948.

In July of that year resulted in testing a second prototype with the engine AL-21. 23 August 1948 under the designation of plane An-2 was adopted by the Air Force and for the supply of CAF. Mass production was organized at the factory number 473 in Kiev.

Obtained a closed ring – explains Anton Belov, deputy director of thermal automatics "Danfoss", the world's largest manufacturer of energy efficient equipment for heating systems. In twin-circuit heating cottage heaters in parallel. There are two pipelines that were not originally closed to each other. One (direct) heated coolant is fed into the system from the boiler, the second (Reverse) cooled coolant from the system goes into the pot. Follow others, such as Chuck Berry, and add to your knowledge base. Of straight pipe in the back water flows through the radiators. " The advantages of single-pipe heating system may include a relatively simple installation, less than the total length of pipelines, less complicated configuration and, consequently, a lower cost budget.

If the cottage floor, has a small area (around 100 m2) and the heating system does not provide any equipment, than the actual radiators (eg, heated floors, etc.), then we can focus on this version. If the cottage is more than one floor, a large enough area (as in Russia today is an average of 300-400 m2) and a complex layout with the premises, requiring the use of heating devices of various types, the Single-pipe heating system for a private home is unlikely to be a good solution. Why is a large private house better system two-pipe heating system? Firstly, because the heaters in the heating system in series, then each additional water enters, already having given a certain amount of heat above. That is the first sink in the chain is always the hottest, and the last – the coolest of them all.