Helicopters are marvelous pieces of engineering, providing a live demonstration of the laws of physics as they carry us into the skies. With metal or composite blades angled just right and spinning at ...

So they can help with downward thrust, as well as lateral thrust for sideways motion or rotation, but they won't contribute to forward or rearward thrust. While it looks like some sort of flying high ...

Not every plane has the luxury of very long airport-worthy runway strips. In fact, many combat scenarios are in non-ideal locations that often do not come with a nice long runway for landing and ...

Chapman and Newell 1 have recently published the following argument : (1) Lugworms can burrow into a particular beach whether covered by sea-water or not. The total downward thrust which a worm can ...