To use a bike instead of round sprocket Ellipso suggested in 1892 Professor V. Prusakov. He decided to put the rods along the minor axis of the ellipse that has allowed more efficient use of the power of the cyclist. Experiments have shown that even an inexperienced rider on a machine with the elliptical sprocket expends energy approximately 30% lower than on moving with the same speed filemashine with a round sprocket. And according to the American engineers, the use of oval zubchatki increases the average speed of a cyclist by about 14%.
ELLIPSE VS CIRCLE
Typically to achieve the necessary alignment of heavy fighting model of the micro retracts in the cutout of the front edge of the wing. This leads to some loss of strength and complication of manufacturing technology, and access to the engine for maintenance is much more complicated. So I had the idea to implement the idea of forward-swept wing is given in the “M-K” № 7 for 1988. Front and rear edge of the wing of the new models are made by gluing pine veneer (thickness of 2-1. 5 mm) on the mandrel with the subsequent cutting on a lathe to the required edge thickness. The bonding is conducted on the PVA. Mandrel is more practical to manufacture of chipboard, and in the mounting position and clamp the veneer pack to apply a lacquer coating to facilitate removal of the part after drying.
Readers rezinomotornaya a replica of a historic aircraft “Moran-G” in which famous Russian pilot P. N. Nesterov first in the world made air RAM .The model was created in two versions — “full” copy with a boxy fuselage and polyopia with a contoured fuselage. To achieve a satisfactory flying qualities, had to go to small deviations from the proportions of the prototype aircraft. The models are made entirely from common materials, the main of which was melkosortnyj packing foam density of 0.05—0.06 g/cm3, chopped termolabil for plate thickness 0.5—1.5 mm. By weight parameters of the model are comparable to the best balsa models. To make their students of 6-7 grades. Choosing a simple plane as a prototype to copy allows to make emphasis in students ‘ work and not to simulate individual elements, and the manufacturing quality of the device.
Timer “school”, published in “M-K” № 12 in 1986, is a unique combination of reliability, service life and good flight properties. Now that our group operated two such machines, we can safely say that. It should be noted that “loss” in sports-related accidents time, unfamiliar to us. Believe it or not, in such main circuit, accurate Assembly of the frame on the plasticized resin and Mylar covering to break the model, even with strongly uprated engine is almost impossible! Of course, strength isn’t everything. But the important and time-saving Modeler, especially spending on “nasty” repairs. So, now all the “repairs” been reduced to mere convergence of the split nodes. At the same time with extraordinary strength achieved and very high rigidity of the machine, which is extremely important for engine model.
Transform an old truck motorcycle IZH-type I was going for a long time. At first I wanted to make something like a scooter “Ant” (like the truck, by the way, once told a “M-K”). However, the design was unreasonably heavy and bulky. And besides, it needed a massive differential or, in extreme cases, overrunning clutch, and to build all this in the country, in a home workshop, it was pure utopia.
The race for sports results brought in the “school” subclasses of automodelisme to professionalize technology. To replace the familiar MK-17 came potentially more powerful engines of the brand MDS. However, if the “Juniors” were already known methods of dealing with their numerous “ills”, the new motors asked the number of problems and issues. But anyway, after a considerable number of specific modifications of MDS reserves its power MK-17.
In the previous issue of the journal “modelist-Konstruktor” readers acquainted with the design of the aircraft “Cree-Cree” of Michel Colomban, who received a truly worldwide fame. According to many aviation experts, aircraft types “KRI-KRI” close to the limit of miniaturization, while some Amateur designers are trying to create models of even smaller size. However, when reducing the size of the aircraft becomes more dynamic, increasing its angular speed, the movement becomes korotkoperiodnye, causing reduced reaction time of the pilot action on the rudder. And at some point it may be insufficient for normal driving.
Wish to give modelers another way to give the sail models naturally convex shape. This method is simple, but perhaps more effective than others. Its essence is as follows.
The Rules on the self-similar sports of the USSR, issued in 1989, a new class: E-5. With the technique permitted by the rules for competition in this class, athletes unfamiliar, and it sharply differs from the known. Try to determine the search paths of optimal solutions racing models-replicas and purpose of this article.
Elegant appearance, ease of fabrication, lack in construction materials in short supply, good flight characteristics are qualities that distinguish a schematic model of the airframe designed in the laboratory of aviation technology rut of Kazakhstan. Such models young Almaty residents repeatedly became winners of various competitions. Maximum results in all rounds is not uncommon when using the proposed “schematicity”. And flight characteristics of the glider was so high that it had to be equipped with a matchlock device forced landing. Without it, many models disappeared in terms.