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Hi,
A new conceprt for VTOL tilt-rotor,please see;
http://www.google.com/patents?id=-PQJAAAAEBAJ&printsec=abstract&zoom=4&dq=boeing+convertiplane
A new conceprt for VTOL tilt-rotor,please see;
http://www.google.com/patents?id=-PQJAAAAEBAJ&printsec=abstract&zoom=4&dq=boeing+convertiplane