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MODELING
Alteration of the micromotor Rhythm. Tips for a modeler
Directory / Radio control equipment In many modeling circles, there is a shortage of good compression micromotors with a working volume of 2,5 cm3. The quality of the only satisfactory KMD-2,5 motor has recently declined so much that the leader is forced to look for ways to provide the members of the circle with tolerable micromotors. Converting good glow motors into compression ones is not only associated with unjustified costs. This work is laborious and requires special skills. And in case of failure, such a hard-to-find, scarce and expensive "kalilka" fails. Therefore, we propose to follow the path of reworking the well-known "Rhythm", mass-produced and inexpensive, using parts from MARZ. The result is a micromotor with a working volume of just over 3 cm3, which can be used in training and competitions of model aircraft, ships and cars of those classes where the cubature limits exceed 2,5 cm3. In addition, such an alteration is also interesting in that it allows the use of individual high-quality parts and components of motors, the use of which in the serial version is impossible or difficult. So, the motors "Rhythm" in most circles are inoperative due to the wear of the pairs, and the quality of the crankcases and especially the fit of the shaft in them on the MARZ engines do not allow these motors to be used for their intended purpose, but only in the form of blanks for alterations. "Rhythms" of any editions are suitable for modification. The most important operation is boring the crankcase under the cylinder liner from the MARZs. If you do not have a boring machine at your disposal, we recommend making a device described in the book by E. Gusev and M. Osipov "A Handbook for Automodellers". At the same time with the bore, a seat for the shoulder of the sleeve is trimmed. Otherwise, the Rhythm crankcase is unchanged, as are all the details of the crankshaft and spool wall. You will also only need to bore the cooling jacket to the size of the sleeve from MARZ. Here you can do with a conventional lathe. However, the operation must be carried out very accurately - the sleeve must enter a cleanly bored jacket with force or when the jacket is heated to 90-100 °.
As already mentioned, a cylinder liner is used from MARP, and with it a piston with a counter-piston. It is better to take these parts from a non-working engine, since even after a short break-in at TDC, a ledge is formed from the development of the sleeve, which will not allow the piston to move higher with an increased stroke on the new converted Rhythm. You may also have to grind the sleeve a little in the upper part, since the serial parts of MARZ have an extremely pronounced "cone" and during running-in, the sleeve scuffing is not ruled out. The piston pin can be used serial, but it is better to make a new, elongated one from the shank of the drill Ø 4,2 mm, due to which it will be possible to simultaneously get rid of excessive play in the pin-piston connection (the nests in the piston are pre-drilled with the same drill). In extreme cases, the connecting rod can also be taken serially, but it is more useful to make a new one, from red-hot duralumin, maintaining a center-to-center distance of 25,5 mm. The final operation is the selection of four flats on the shoulder of the sleeve for the head mounting screws. After thoroughly washing all the parts in gasoline, a new microengine is assembled, making sure that the fixing groove on the sleeve is located in front or behind the crankcase, which will prevent the piston pin from falling into the liner purge channels. The "Rhythm" converted in this way is distinguished by a good launch, stable operation and power close to the power of a good KMD. However, this power on the "Ritm" is realized at lower speeds - due to the increased torque, which allows the use of propellers of increased diameter on enlarged cord aerobatic aircraft models for flights on cords about 18 m long. In some cases, it is useful to equip the engine with a muffler soldered from tin . Its configuration may be different; successfully tested on the converted "Rhythm" is shown in the figures. In the radio version, the engine can be easily equipped with a controlled carburetor, if you use the rear wall from the KMD with a 5 mm thick spacer and replace the standard futorka with a radio carburetor. Author: A.Zagorodniy
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