Associate Professor of the Department “Technology of mechanical engineering” of the Mari state technical University M. L. Popov, having a great experience with Bicycle sport, sent a letter to the editor which described and theoretically substantiated his view on the problem of improving the reliability of the bearing unit of the carriage. Today we publish only constructive and technological proposal of the author. More than 20 years of experience continuous all-weather and all-season operation of my bike model-542 “Sport” issued in 1974, the total mileage of which amounted to about 100 thousand km, as well as analysis diary entries have led to the conclusion that the bottom bracket for reliability is in fourth place after floreina, driven sprocket and drive chain.
PROLONG THE LIFE OF THE BIKE
“Passenger car” combined with cargo trailer is an extremely convenient vehicle. However, it is not without flaws, which sometimes nullify all its advantages. In particular, significantly reduces the maneuverability of the car and it becomes almost impossible to reverse because the motorists unlike professional drivers a bad maneuver composite vehicles. Low passing “the Zhiguli” or “Zaporozhets” with a massive “tail” at the country and field roads. So, you need a simple and inexpensive malogruzovaja type scooter “Ant”, but with a closed cabin and higher payload. And best of all — based on motorcycle components and assemblies: this will allow you to register it as a cargo motor transport funds. Moreover, motor units are much cheaper car.
The driving force of the engine during the flight of model airplanes, aerovision or aeromobile is the thrust of the propeller. The quality of the workmanship and clarity of the selection of the propulsion depends largely on the General characteristics of the constructed model. It is therefore clear that the design process of the propellers is paid maximum attention. However, the calculation methods of the selection of propellers is highly intricate, time-consuming and not very accurate. Today we recommend a number of well-established screws, already tested on a mass micro-motors internal combustion.
I want to offer the readers I used in the method of the door trim: it is simple, inexpensive, convenient and allows you to achieve a good zvono and heat insulation front door. And without removing it from its hinges, which is important, especially if work is carried out in winter conditions. First I affixed to the door of glued newspaper sheets: noting in this paper the flag the perimeter of the door, got the pattern of the door, leaving the allowances at the edges of 15 — 20 mm. Glued this pattern (sometimes) I have had the sheet of foam (with bone glue). Instead of foam you could take an old cotton quilt, pre-quilted burlap or other insulation deadener. Protruding beyond the edge of the pattern pieces of foam (not sure it should be a full list — possible and connected of separate pieces) cut.