For years, the rubber motor due to its ease of use and low cost were the main engine modelers. But now, with the abundance of micro-motors boat and car with rubber motor find its ardent supporters, as evidenced, in particular, and editorial mail. Among your questions, dear readers, the most frequent two. So T zavgorodnego from Volgograd, E. Shcherbina from Semipalatinsk, A. Zhdanov of Moscow and other interested in how to calculate the number of turns of the rubber motor to maximize its energy, and what is its maximum energy efficiency.
The rubber motor is powered by the internal energy of the stretched rubber threads. To increase the length they can pretty much 6-7 times or more, and distinguishable varieties are stretched in different ways. There are several formulas that can be used by modelers in calculating the rubber motor. One of them can determine the relative elongation λ (lambda) is the ratio of the increment of length to the original. In a formula it is written like this:
where 1 is the length of the rubber in the free state, and Δ1 is the increment of length.
Stretching rubber thread, we spend a certain amount of energy, but get back only 65— 67%. Loss Vizcaya costs of internal friction in the rubber. Consequently, the coefficient of performance (COP) of the rubber motor can not be greater than 0,65—0,67.