This is a result of a well-known phenomenon in fluid mechanics known as a bluff body wake. The truck is the bluff body and flow recirculation occurs in its wake. The flow over the sides of the truck separates at the sharp corners at the back of the truck, resulting in a zone behind the truck where the air…

In the aerospace field, we ALWAYS refer to solid rocket “motors” and liquid rocket “engines.” My colleagues absolutely insist on this distinction, but I have never figured out exactly why. Thoughts?

At first glance, it looks like Professor from Futurama. I don’t even watch Futurama.

Great article, really got me thinking about what a solution to the root of this problem could be. My first thought is maybe we should push automakers to offer more affordable and practical new car options in the US market.

*GMD

I have worked for years with scientists who left the Soviet Union after the collapse. One of them (who was actually involved in designing ICBM systems) told me that he thinks the best way to end a totalitarian regime like DPRK is to ignore it or even to become its ally. He thinks that the controlling party retains…

Depends on your style:

30 kW is actually quite a lot for a high-quality beam with small divergence, especially if you consider that it can be delivered with incredible precision. Lasers are somewhat unique, so we have to think more in terms of intensity rather than power, or our intuition could fool us. Sure, it will not usually cause some…