Rotor blade manufacturer Van Horn Aviation (VHA) successfully completed a series of ground and flight tests of its composite MD 500 main rotor blades during a four-hour test session at the MD Helicopters Inc. (MDHI) facility in Mesa, Arizona aboard a MD 530FÂ® test aircraft.
According to VHA president James R. Van Horn, the April 7, 2011 flight test featured the first commercially-developed composite main rotor blades flown on the MD 500 series helicopter since the aircraft was first developed as the Hughes 369 in 1963.
â€œThis flight test marks a significant step forward in increasing the capability of a well-respected and productive helicopter,â€ said Van Horn. â€œOur goals in replacing the current metal blades with more efficient composite blades include increasing the helicopterâ€™s internal gross weight and nearly tripling the blade life limit while also decreasing aircraft fuel burn rates, overall aircraft noise and direct operating costs.â€
Greg Ashe, a retired Boeing experimental test pilot who served as the project test pilot on the Hughes 369F model and has more than 800 experimental flight test hours in the MD 500 series, performed all of the ground and flight tests with assistance from VHA and MDHI ground crew.Â The test session had three distinct parts:Â track and balance of the VHA blades, hover tests, and low-speed forward flight.
â€œWe are thrilled that the composite blades performed well enough in initial ground and hover tests to take the aircraft into low-speed forward flight on the bladeâ€™s first flight test,â€ said Van Horn, a former U.S. Army instructor pilot who served as flight test engineer on the VHA MD 500 test session. â€œOur blades are very stable, even through transitional flight.â€
The flight test followed a static pull test performed at VHAâ€™s Tempe, Ariz., facility on March 28, which showed the composite blade could withstand static load of more than 47,000 lbs. The static pull test provided confidence in moving forward with the flight test program.
â€œAnother program goal is to create a blade for the MD 500 series thatâ€™s easier to track and balance,â€ said Van Horn. â€œWe were able to track and balance our blades in a minimum of iterations. The blades responded as expected when trim tab or pitch link changes were made, and they were resonance-free through the entire RPM range.â€
The VHA MD 500 main rotor blade shares the same NASA-designed laminar flow airfoil, shaped tip, and composite structure as VHAâ€™s successful 206B/L composite tail rotor blade, which received a Supplemental Type Certificate from the Federal Aviation Administration in September 2009 and has been in production since. One of the features of the VHA 206B/L blade is reduced overall aircraft noise, and the initial flight of the VHA MD 500 blades seem to confirm that the new main rotor blades will significantly reduce the overall aircraft noise as well.
â€œYou can hear the difference between the metal and VHA composite blades even at a hover,â€ said VHA general manager Dean Rosenlof, who was one of six VHA employees on hand to witness the flight test.
The April 7 flight test confirms the bladeâ€™s design, which was built with prototype tooling. Over the next few weeks, VHA personnel will design and build the production tooling required to manufacture conformed blades for FAA certification testing.Â Flight testing is estimated to resume with conformed blades in third quarter 2011.
About Van Horn Aviation
Based in Tempe, Ariz., Van Horn Aviation specializes in the design, certification and manufacturing of aftermarket dynamic components for various rotorcraft. Its current products include a composite tail rotor blade certified for the Bell 206B3, 206L series and OH-58, and an aftermarket carbon fiber tail rotor blade for various models of the UH-1.Â For more information, visit www.vanhornaviation.com.
About MD Helicopters, Inc.
MD Helicopters, Inc. is a leading manufacturer of commercial and military helicopters.Â The MDHI family of rotorcraft is world renowned for its value, versatility and performance.Â The MD Helicopters family includes the twin-engine MD ExplorerÂ®, and single engine versions of the MD 600NÂ®, MD 520NÂ®, MD 500EÂ® and MD 530FÂ®. The NOTARÂ® system for anti-torque control is used exclusively by MD Helicopters. The company is based in Mesa, Ariz.Â For more information about MDHI visit http://www.mdhelicopters.com
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