helicopters

If the engines on an airplane fails, you'd think from its appearance that its wings can often glide it to safety. But for a helicopter, the rotors are so small relative to the mass of the whole aircraft, a broken engine looks like it would cause a sharp drop to the ground.

A NATO airstrike hit two Afghan military checkpoints on Monday in a restive province east of the capital, Kabul, killing seven Afghan troops

If the engines on an airplane fails, you'd think from its appearance that its wings can often glide it to safety. But for a helicopter, the rotors are so small relative to the mass of the whole aircraft, a broken engine looks like it would cause a sharp drop to the ground.

A NATO airstrike hit two Afghan military checkpoints on Monday in a restive province east of the capital, Kabul, killing seven Afghan troops