Why do open car windows make a throbbing noise? Introduction Have you ever opened a window in a car, only for your ears to be met with an annoying throbbing noise? It’s a rhythmic thumping sound, sometimes fast, sometimes slow. It can very quickly become uncomfortable (and the driver of the car or passengers may […]

What is specific impulse, why is it measured in seconds and how do you calculate it? Introduction There are hundreds of different factors to consider when designing a rocket engine. However, one of the most important is specific impulse. What is specific impulse exactly? Specific impulse (or ISP for short) is the measure of how