Tandem. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
Free library / Directory / Personal transport: land, water, air

Tandem. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

A heel with holes for M4 screws is welded to the trunk of the first bicycle: the kingpin base will be attached here. And he himself is made from the front fork rod (selected from old or spare ones). A base is welded to the king pin from below, and a cruciform hinge bush is put on top of it. As a vertical part, a piece of the steering sleeve of an old bicycle or a blank from an inch pipe can be used: its ends are machined under the bearing cups from the steering sleeve. The cross (horizontal) part is made of a triple Ø 28 mm. An axle with bearings from the old front wheel is inserted into it. Thus, the cruciform hinge will provide two degrees of freedom: rotations around the vertical and horizontal axes.

Tandem
Rice. 1. Tandem

Rice. 2. Scheme of the coupling assembly and its details (only limiting dimensions are given) (click to enlarge): 1 - trunk, 2 - heel, 3 - kingpin base, 4 - kingpin, 5 - cruciform hinge, 6 - bracket, 7 - brace, 8 - cup, 9 - insert, 10 - wing nut, 11 - steering sleeve, 12 - coupler

The attachment point of the second bicycle (bracket) is made of a thick-walled tube Ø 14 mm (it is possible to use suitable parts of the forks of old bicycles). Externally, the bracket looks like a mini-fork with a cross member and a strut. The top of the arcuate part and the lower end of the strut are welded to the cut-out cups, which are put on the steering sleeve of the second bicycle. With the help of a hollow coupler, two inserts to the wing nut, the bracket is attached to the steering sleeve; a steering wheel is installed in it in the usual way. The front fork rod of an old bicycle can be used as a tie.

Having built and tested such a tandem, I was satisfied with it; convenient, simple and reliable in operation.

Author: V.Karpukhin

We recommend interesting articles Section Personal transport: land, water, air:

▪ Amphibian Mini mokik

▪ Monoski surfer

▪ Correction of the bicycle eight

See other articles Section Personal transport: land, water, air.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Energy from space for Starship 08.05.2024

Producing solar energy in space is becoming more feasible with the advent of new technologies and the development of space programs. The head of the startup Virtus Solis shared his vision of using SpaceX's Starship to create orbital power plants capable of powering the Earth. Startup Virtus Solis has unveiled an ambitious project to create orbital power plants using SpaceX's Starship. This idea could significantly change the field of solar energy production, making it more accessible and cheaper. The core of the startup's plan is to reduce the cost of launching satellites into space using Starship. This technological breakthrough is expected to make solar energy production in space more competitive with traditional energy sources. Virtual Solis plans to build large photovoltaic panels in orbit, using Starship to deliver the necessary equipment. However, one of the key challenges ... >>

New method for creating powerful batteries 08.05.2024

With the development of technology and the expanding use of electronics, the issue of creating efficient and safe energy sources is becoming increasingly urgent. Researchers at the University of Queensland have unveiled a new approach to creating high-power zinc-based batteries that could change the landscape of the energy industry. One of the main problems with traditional water-based rechargeable batteries was their low voltage, which limited their use in modern devices. But thanks to a new method developed by scientists, this drawback has been successfully overcome. As part of their research, scientists turned to a special organic compound - catechol. It turned out to be an important component that can improve battery stability and increase its efficiency. This approach has led to a significant increase in the voltage of zinc-ion batteries, making them more competitive. According to scientists, such batteries have several advantages. They have b ... >>

Alcohol content of warm beer 07.05.2024

Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>

Random news from the Archive

Efficient molecular diodes 06.07.2017

An international team of scientists from the United States, Ireland and Singapore, led by Professor Christian A. Nijhuis of the National University of Singapore, has for the first time been able to create efficient molecular rectifier diodes.

Diodes are electronic elements that have different conductivity depending on the direction in which current flows through them. Rectifier diodes convert AC to DC; their main characteristic is the rectification factor K, equal to the ratio of the values of the alternating voltage at the input and the rectified voltage at the output.

For modern industrial silicon rectifier diodes, K values vary from 105 to 108. However, for molecular diodes - molecular-scale elements that could theoretically be used to create superminiature electronic devices - this figure has so far been, at best, 103, which is clearly not enough.

Now Nijuys and his colleagues have succeeded in creating a molecular diode with a rectification factor of 6.3x105. These are macroscale tunnel transitions based on a single layer of molecular diodes. The number of molecules conducting current in these junctions varies with bias polarity, thereby multiplying the internal rectification factor of an individual molecule by three orders of magnitude.

"This exceeds the theoretical limit," commented Professor Enrique del Barco of the University of Central Florida, one of the paper's co-authors. "Now we have a molecular diode comparable in performance to silicon. What was a theoretical scientific model is moving into the plane of commercial possibilities.

However, for now, molecular diodes, apparently, will not replace completely electronic ones - but they may be able to replace them in some areas. One of their advantages is low cost and ease of production, because molecular diodes can be synthesized directly in the laboratory.

Other interesting news:

▪ New Debug Platform for DaVinci Processors

▪ Bear self-treatment

▪ White graphene for microcircuit cooling

▪ Liam F1 Silent Wind Turbine

▪ US Special Forces Brain Trainer

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Spectacular tricks and their clues. Article selection

▪ article by Christian Huygens. Biography of a scientist

▪ Why do astronomers think there might be life on Mars? Detailed answer

▪ Gomuti Palm article. Legends, cultivation, methods of application

▪ article Starting a car engine from an outlet. Encyclopedia of radio electronics and electrical engineering

▪ article VHF converter for 144 MHz. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews