The second factor is the rate at which mass is ejected from the rocket. ROCKET EQUATIONS gravit accel g 9.8100 m/s² thrust T 10.6829 N=kg*m/s² air density rho 1.2230 kg/m^3 impulse I 2.4960 N*s=kg*m/s drag coef cd 0.7500 boost mass mb 0.04344 kg rocket body mr 0.0288 kg coast mass mc 0.04188 kg engine empty ee 0.0131 kg burnout time tau 0.23364 s propellant mp 0.0031 kg velocity b vt 53.97011 m/s Specific impulse is expressed in seconds. The whole purpose of the propulsion system is to produce thrust. The third factor is the mass m of the rocket. 14. Thrust, being the force that a motor exerts, is what propels a rocket into (and beyond) the "wild blue yonder"! A large fraction (typically 90%) of the mass of a rocket is propellant, thus it is important to consider the change in mass of the vehicle as it accelerates. 1 Thrust and Specific Impulse for Rockets . 14. Rocket Thrust Equation. We can now look at the role of specific impulse in setting the performance of a rocket. A rocket engine has a combustion chamber where the oxygen and fuel get mixed up and are exploded. Ask Question Asked 3 years, 5 months ago.

Previously we used the steady flow energy equation to relate the exhaust velocity of a rocket motor, Figure 14.1, to the conditions in the combustion chamber and the exit pressure. Specific Impulse. This is the factor Δm/Δt in the equation. Viewed 531 times 1 \$\begingroup\$ I am doing the math required to find the thrust of a rocket engine (more specifically backwards, I have the thrust required and I am designing the engine). Without a doubt, this parameter is foremost in the mind of any amateur rocket motor designer. 2 The Rocket Equation . The propulsion of a rocket includes all of the parts which make up the rocket engine: the tanks pumps, propellants, power head, boosters, and rocket nozzles, etc. The specific impulse of a rocket, I sp, is the ratio of the thrust to the flow rate of the weight ejected, that is where F is thrust, q is the rate of mass flow, and g o is standard gravity (9.80665 m/s 2).. Active 1 year, 2 months ago. Rocket Motor Thrust and theThrust Coefficient.

The thrust that a rocket motor generates is the most fundamental yardstick of performance. The quantity (Δm/Δt)v e, with units of newtons, is called “thrust.” The faster the rocket burns its fuel, the greater its thrust, and the greater its acceleration.