|
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese|
MODELING
catamaran model. Tips for a modeller
Directory / Radio control equipment In the hands of Roman Ivanovich Romanov, a variety artist, was a model of a catamaran. Two toy boats were connected by a duralumin sheet. On it, I noticed a simple mechanical device: an electric motor, a gearbox, on the output shaft of which a small flywheel was planted, a connecting rod, a link and a drive shaft. At the end of the drive shaft, behind the stern of the catamaran, some strange mover was placed - two plastic cups. - And what, - I asked Roman Ivanovich, - are these cups capable, like a propeller, of pushing the model forward? - You don't believe me? Let's go try it in the bath. Once Roman Ivanovich scooped up water with a bucket, slightly raised it. But what is it? Some force pushed the hands in the opposite direction from the bottom. I checked again. The result is the same. The water flowing out of the bucket created thrust very similar to jet thrust. He decided that this effect could be used to set the models in motion. He took his catamaran. I put him on the water. Turned on the switch. The electric motor started, the transmission began to move, and the cups began to swing up and down with a slight swing. Alternately, each of them is completely immersed in water, and then completely comes out of the water. The model swam, picking up speed. - I did not immediately think of this model. For a long time I puzzled over how to switch from the effect with a bucket to a real model. At first, I didn’t have a catamaran, but a boat. At its stern, I installed a foam wheel, at diametrically opposite points of which I fixed the cups. The boat sailed, but slowly - the wheel provided too much resistance. And she did not swim in a straight line, but in zigzags. There were three more intermediate models that had some disadvantages. And here is the catamaran. It seems to me that many technical contradictions have been overcome here. Swinging plastic cups slow down the model less. They work so efficiently that they create more thrust than a propeller powered by the same battery. From this we can conclude that the efficiency of the propulsion unit is higher. But this is only for models. For real sea or river vessels, I do not presume to assert this. Most likely, this effect will manifest itself better at low speeds.
Saying goodbye, Roman Ivanovich turned to you guys to think and look for answers that explain the effect, as well as experiment with an unusual mover. Any modeler can choose the dimensions of the model at will. But we advise you to approach this work creatively, to think about your design, because the mover can be installed on the model in many ways. And the last thing: I would like to receive from you experimental confirmation of the determination of the efficiency of the propulsion unit in comparison with a propeller or a water jet propulsion unit. "Why convert rotation into rolling and lose part of the engine power on this?" - thought the inventor Alexander Grigoryevich Presnyakov.
Experiments have begun. First he built a boat. I installed a wheel on its stern, along the diameter of which I installed cups at opposite points. The wheel did not rotate along the movement of the model, but across. The model swam, but slowly, in zigzags. Then there were four more models, and each has its drawbacks. And here is the latest model, the same one that Presnyakov brought to the editorial office. See it in the picture. The rotating cups slowly enter one after the other into the water. They are not flat bottomed. slow down, but, on the contrary, push the model forward. The most powerful impetus is given to the model by the mover when the cups come out of the water. At this point, they are filled with water to the brim, it pours out and creates jet thrust. And in order for the thrust to be constant, holes were made in the bottoms of the cups and rims were inserted into the necks to guide the blades. The dimensions of the model, if anyone wants to repeat Presnyakov's idea, can be chosen independently, having previously selected a mechanical drive from an old and already unnecessary toy. But the inventor advises to approach the work creatively, because the mover does not have to be installed the way he did. Author: V.Rotov
Machine for thinning flowers in gardens
02.05.2024 Advanced Infrared Microscope
02.05.2024 Air trap for insects
01.05.2024
▪ Hydrogen storage - the path to energy security ▪ BlueNRG-1 is a new single-chip Bluetooth Low Energy solution
▪ section of the site Civil radio communications. Article selection ▪ article Kepler Johannes. Biography of a scientist ▪ article Who sailed to Colchis and why? Detailed answer ▪ article Insulator on thermal insulation. Standard instruction on labor protection
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua |
We recommend interesting articles Section 
See other articles Section 
Latest news of science and technology, new electronics:
All languages of this page