. Drawing, description

MODELING
Free library / Directory / Modeling

LPG micromotor. Tips for a modeller

Modeling

Aircraft modelers have not yet paid attention to a very promising engine running on liquefied CO2 gas. But the ease of manufacture and operation make it much more affordable than compression and glow engines. In addition, it does not pollute the air and is silent in operation. With this engine (Fig. 1) various aircraft models weighing up to 100 g can work. From one can for siphons, the tank (Fig. 2) can be filled twice.

The working volume of the engine is 0,27 cm3. With a propeller Ø 180 mm, it develops 1900-2100 rpm. Flight duration 45-50 s.

Let us dwell in detail on the manufacturing technology of the most complex and critical engine parts.

Turn the crankcase from D16T duralumin on a lathe, followed by metalworking of the outer surfaces. Thread M9X0,8 cut on the machine. Drill a hole for the shaft and machine with a Ø 4 mm reamer.

The cylinder is easier to make from a round bar of stainless steel Ø 15 mm on a lathe. Cut the thread on a screw-cutting lathe from one installation.

Bring the inner diameter of the cylinder after boring with a cast-iron lap to the size indicated on the drawing.

Make the crankshaft on a screw-cutting lathe from steel 45. With one installation, drill a hole for thread No. 2,5 and cut it. Bring the shaft journals to Ø 4 mm using sandpaper No. 00 and subsequent lapping with GOI paste in place in the crankcase.

Rice. 1. CO2 engine (click to enlarge): 1 - tube, 2 - spring housing, 3 - spring, 4 - ball Ø 4, 5 - gasket, 6 - fixing nut, 7 - piston pin, 8 - connecting rod, 9 - thrust washer, 10 - cone, 11 - spinner bolt, 12 - crankshaft, 13 - crank pin, 14 - crankcase, 15 - piston, 16 - rod, 17 - cylinder, 18 - cylinder cover, 19 - cylinder head

(click to enlarge)

Then mark, drill on a drilling machine and cut an M2 thread for a hole for the crank pin. The finger itself is machined from steel 45 or silver. Sand its surface with sandpaper, then cut the M2 thread.

Make cylinder heads from D16T duralumin. Cut the internal thread on a screw-cutting lathe.

Turn the connecting rod on a lathe from D16T duralumin. First make the connecting rod heads spherical, then grind off part of the sphere with a file. Punch the centers of the holes for the piston pin and the crank and drill them on a drilling machine.

The spring used in the engine head is taken from a small capacity aerosol can. For those who cannot get it, we report the parameters: wire Ø 0,8 mm, spring diameter 4 mm, length 7-8 mm.

The spring for the filling valve (Fig. 3) is made of OBC wire Ø 0,4 mm. It has an outer Ø 4 mm and a length of 10 mm.

In the filling device, the spring is the same as in the engine cylinder. For gas lines, a stainless steel tube Ø 1,5-2 mm is required.

Assembly order. Press the rod into the hole in the piston bottom with a light hammer blow. Insert piston pin and connecting rod. Make notches on the sides of the hole to prevent your finger from coming out. Then, lightly lubricating the neck of the shaft, insert it into the crankcase. The shaft should rotate easily. Lower the connecting rod through the upper neck of the crankcase. Align the hole in the head with the hole on the shaft, insert the crank pin and screw it in until it stops. Make sure that the connecting rod has a freedom of movement of 0,4 mm on the finger.

Then solder the gas pipeline to the spring body and assemble the valve assembly according to the assembly drawing. Gather the rest of the knots as well. Bend the gas pipeline over the engine head in the form of a Ø 25 mm spiral. This is necessary for the complete evaporation of liquid gas in the gas pipeline. By lowering and raising the cylinder, achieve the desired phase of gas inlet into the over-piston space, the clarity of the engine depends on this.

The cartridge is inserted into the filling device (Fig. 4) using a clamping sleeve from the siphon.

Air screw (fig. 5) made of linden.

Author: V. Loktionov

We recommend interesting articles Section Modeling:

▪ Race model retractable landing gear

▪ S3A class missile

▪ From solar energy to mechanical

See other articles Section Modeling.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

A New Way to Control and Manipulate Optical Signals 05.05.2024

The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>

Primium Seneca keyboard 05.05.2024

Keyboards are an integral part of our daily computer work. However, one of the main problems that users face is noise, especially in the case of premium models. But with the new Seneca keyboard from Norbauer & Co, that may change. Seneca is not just a keyboard, it is the result of five years of development work to create the ideal device. Every aspect of this keyboard, from acoustic properties to mechanical characteristics, has been carefully considered and balanced. One of the key features of Seneca is its silent stabilizers, which solve the noise problem common to many keyboards. In addition, the keyboard supports various key widths, making it convenient for any user. Although Seneca is not yet available for purchase, it is scheduled for release in late summer. Norbauer & Co's Seneca represents new standards in keyboard design. Her ... >>

The world's tallest astronomical observatory opened 04.05.2024

Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>

Random news from the Archive

Road traffic can exacerbate allergies 20.12.2018

A new study by American scientists has shown that air currents from heavy traffic can disperse ragweed seeds tens of meters from their starting location - a huge boost compared to the usual 1-meter seed travel radius from parent plants.

The researchers set up a field experiment to determine how far ragweed seeds travel on a busy road with fast moving cars compared to less busy roads. In each trial, they placed 100 seeds dyed with fluorescent paint along the edges of roads where they would normally fall, allowing moving vehicles to decide their fate. The scientists then returned with UV lamps to mark the new positions of the seeds.

Within 48 hours, the seeds moved to new locations. Most remained close to their original location. But air currents, due to heavy traffic, moved some of the seeds tens of meters: in the record case, this distance was 71 meters - about two-thirds of the length of an American football field. Even on roads with less traffic, the seeds were scattered over distances of up to 40 meters.

The researchers then mapped roadside ragweed sites for two years in a row to see how much ragweed populations increased in the direction of traffic. In the second year, the team registered twice as many seedlings in the direction of traffic, compared to the opposite direction, where the influence of cars was almost zero.

The study links the spread of an allergic plant species to traffic patterns for the first time. The results show that people suffering from seasonal allergies can be helped by carefully mowing roadside plants. But the right time to mow is just before the seeds are ripe, otherwise the mowers will spray them even further.

Other interesting news:

▪ Intel Cyclone 10 Field Programmable Gate Arrays

▪ A computer the size of a business card and a millimeter thick

▪ A new family of highly integrated real-time clocks

▪ Graphene's success is hindered by silicon particles

▪ Reproduced the scent of an Egyptian mummy

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the website Basics of First Medical Aid (BFA). Selection of articles

▪ article I was, I thought, I passed like smoke. Popular expression

▪ article What is an audit? Detailed answer

▪ article Aerosleigh Triumph. Personal transport

▪ article Chrome adhesive mass. Simple recipes and tips

▪ article Relay protection. Protection of overhead and cable lines in 20 and 35 kV networks with isolated neutral. 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