Barring the smallest manned airplanes, most aircraft that are pulled around by a prop have variable pitch propellers. The reason for this is simple efficiency. Internal combustion engines are most ...

Inverted Quadcopter? That generally means a crash is soon to follow. Not so for a new crop of quadcopter fliers. These new quadcopters are capable of sustained inverted flight. We’ve seen inverted ...

The propeller component of this assembly was manufactured by Ole Flottorp in Chicago, Illinois for James B. Lund and R.D. Dwight, also of Chicago, who designed and constructed a mammoth tandem ...