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Carter Aviation's VTOL prototype achieving lift-to-drag values 2.5 times better than helicopters
Significant progress has been made as performance flight-testing of Carter's vertical takeoff / landing prototype continues. In terms of the coupling of speed, range and efficiency with VTOL capability, there is no competing technology.
The POC is continuing to expand the high speed / slowed rotor envelope. Over the last month, conservative performance flight-testing has yielded the following results:
· Lift-to-drag (“L/D”) values of 10-12 at high speed cruise at a test weight of 3,950 lbs – around two to two-and-a-half times better than the most efficient helicopters
(L/D is a measure of the efficiency of an aircraft. Higher L/D ratios are one of the primary goals in aircraft design, inasmuch as an aircraft’s required lift is determined by its weight, delivering that lift with decreased drag leads directly to enhanced speed, fuel economy, climb performance, and glide ratio.)
· Speeds of 160 mph at 200 HP (with this configuration expected to exceed 235 mph at 25,000 feet & 350 HP)
· Altitude of 12,000 feet
· Flight with the rotor slowed to 106 rpm
· Thus far, an advance ratio of 0.85
(The advance ratio is calculated by dividing the forward airspeed of the aircraft by the tip speed of the rotor. As the rotor rpm (i.e., the tip speed) is reduced, the advance ratio increases. As the advance ratio increases, drag on the rotor decreases dramatically, resulting in increased efficiency.)
Additionally, jump takeoffs are now routine and used in virtually every test flight.
The company will continue to expand the high speed/slowed rotor envelope in the coming weeks, and will gather more data on flight efficiencies under those conditions. A video showcasing the company’s progress is available at, http://www.youtube.com/
About Carter Aviation Technologies, LLC. Carter Aviation is an aerospace research and development firm that has developed a technology, known as Slowed Rotor/Compound (SR/C™) Technology, which couples the speed, range and efficiency of an airplane with the vertical takeoff and landing (VTOL) capability of a helicopter. At its core, SR/C™ Technology represents the simple yet elegant hybridization of airplanes and rotorcraft through remarkable innovations in engineering design.
Carter Aviation's technical achievements have been independently verified by NASA, the U.S. Army, and the nation’s top Center for Rotorcraft Excellence at the Georgia Institute of Technology. Its SR/C™ aircraft are protected by more than 20 U.S. patents, many of which have also been filed in foreign patent offices.
Importantly, SR/C™ aircraft: (a) have 3 to 6 times the range of helicopters (and 300% to 600% lower fuel consumption);
Baron T. Oursler, VP & CLO
Page Updated Last on: Nov 28, 2012