Construção de uma bancada para aferição do empuxo de motores glow e estudo da influência da adição de nitrometano ao combustível

Abstract

The proposal of the present work focuses on the construction of a bench to measure the thrust of engines used in model airplanes. Glow 2stroke engines are widely used in aeromodelling, the most common fuel for these types of engines being a mixture of methanol, castor oil and nitromethane. In this work, a study was made of the influence of the concentration of nitromethane on the thrust, torque and power of the engine. The experimental apparatus consists of a static traction bench, in which the engine is fixed to a support coupled to a pair of rails, giving mobility to the support and enabling the measurement of the engine thrust. With the aid of a tachometer and the thrust values, power and axle torque were determined. Four tests were carried out and it was concluded that the addition of 5% nitromethane was the most impactful on the characteristics analyzed, however the best functioning of the engine occurred with the mixture of 10% nitromethane.