The CarterCopter is an experimental compound autogyro developed by Carter Aviation Technologies to demonstrate slowed rotor technology. In 2005, the CarterCopter became the first rotorcraft to achieve μ-1, an equal ratio of airspeed to rotor tip speed. The prototype has a top speed of about 173 mph. A helicopter requires twice as much power to maintain that velocity.
The Daily Omnivore 
Leave a comment