From experience we know that the appearance of ultralights “beetle-42” generates a lot of emotion and, of course, questions. Emotions lower, and all of the many issues leave one of the most significant: why is he not three-, and four-wheel chassis? Before you answer, remember that a vehicle with a tricycle landing gear and a forward driven wheel is unstable on turns and uneven ground and prone to rollover. The same can be observed in three-wheeled Beltelecom in the most critical modes of operation — the landing. And especially on unprepared sites. As practice shows, from tipping there, no one is immune: not a beginner, nor a master.
It all started with the fact that we are a young childless family bought two “Kama” and became interested in Cycling. With the birth of his daughter had to solve the task: how to travel together? Did a little chair, and set it on the rear trunk. It has served us faithfully for several years But the daughter grew up, and sit in the car seat she was cramped, uncomfortable, the idea of creation of easy folding, durable enough trailer stroller, quickly attachable to the bike.
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.
