One of the most interesting pages in the history of world tank development was, without doubt, the period of creation towered tanks. He covered almost all of the 1920-ies that is not accidental, because the whole concept of mnogobashenniye schema is a logical continuation of the scheme British tanks during the First world war. English diamond machines were created to break through the defensive positions of enemy infantry, therefore, the location of the main weapons in side sponsons seemed quite obvious. When crossing the defensive lines so it was easier to kill the enemy infantry, entrenched in the trenches. Shots were fired from both sides along the trenches. In the process of transition to tower layout, which was apparent at the final stage of the First world war, the scheme with the placement of the weapons in the sponsons transformed into mnogobashenniye.
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They are large and small, foldable and “monolithic”, table and floor — the different designs, but with one common shortcoming: require space for storage. We are talking about Ironing boards. Indeed, so necessary for each family household goods, and such an archaic, “clumsy”! where to clean it up when all the sheets are in order? However, came to light and the modern Ironing devices going, so to speak, in pace with the times scientific and technological progress: electric units in which instead of heating the iron bar, and the role the Board performs a cylindrical roller. But this construction is even more difficult to attach in the apartment so that it had not violated the interior.
Present Board milling machine come in handy craftsmen who love to work with wood to get the blanks embossed surfaces, various geometric patterns, as well as cutting slots, grooves, sockets (both simple and shaped), etc. the Machine consists of two main parts: a base attached to it the guide posts and spring-loaded platform on which is mounted an electric motor.
Wheeled Buer, beach sailing, sand yacht, metromobile… All these terms refer to the same Tina of vehicles using the movement force of the wind. Designs of such “petroholod” — a great many, from year to year are added up — three wheels and four, with Latin sail and with the Bermuda arms, hard planes, reminiscent of an aircraft wing, and even with a horizontally positioned fan-like impeller anemometer.
Well-made screw — the key to a successful flight “butterflies”. Pick up the wood, without the ROE and knots. Billet screw vystrugat in the form of a rectangular bar size 160х8х10 mm. In the center of the puncture hole for the axis. Then make a paper template of one of the propeller blades. Aligning the centers of the template and of the bar, move the contours of the blade first on one half of the bar, and then another. Billet astrogate a knife strictly on the contour, do the same with a lateral projection. Holding the billet in his left hand, on the opposite half cut the right corners. When finishing, try to front (top) part of the blade was slightly convex and the lower flat or even slightly concave.
Tupolev SB aircraft was conceived as a bomber, overtaking fighters. It was natural to create a heavy fighter, designed primarily to combat the bombers. Total produced three prototypes of the SB. According to the decision of the meeting of February 14, 1934, one of them got American motors “Cyclone”, another French Hispano-Suiza, and the third was going to keep in reserve in the form of a set of units. Three days later appeared a decree of the Council of labor and defense (STO), which stated that the third prototype of SB should be equipped with the type of engine, which is better to manifest themselves on tests.
Soldering metal tin solder — one of the most common but, unfortunately, the connection is not too strong. A more reliable seal provide so-called “hard” solders — silver-copper or copper-zinc. Most often, when brazing use a gasoline blowtorch. However, they should be treated skillfully: the lamp is unsafe in the fire relation, smokes when running, the flame is poorly adjusted.
Experimental aircraft D-558-I. In late 1944 the Douglas firm received an order to develop an experimental aircraft with a turbojet engine. The main goal of this project was to obtain information about the aerodynamic loads, stability and controllability of the aircraft at transonic speeds. These data were to complement the information obtained in the course of implementation of the programme of tests of a supersonic aircraft X-1. In accordance with the specification developed by NACA (national Advisory Committee for Aeronautics) the aircraft was to take off from the aerodrome, to gain height from 6000 to 10,600 m, within 10 minutes to fly at transonic speeds and then return to the airfield.