Christopher R Butler

US Patent:

20170210463, Jul 27, 2017

Filed:

Sep 30, 2015

Appl. No.:

15/501100

Inventors:

- Stratford CT, US
Michael J. Kostoss - North Branford CT, US
Eric Lucien Nussenblatt - Stamford CT, US
Justin Thomas - New Haven CT, US
Christopher Paul Butler - Frisco TX, US
Brandon Michael Cerge - West Palm Beach FL, US

International Classification:

B64C 27/00
B64C 27/82
B64C 27/10

Abstract:

An aircraft is provided including an airframe, an extending tail, and a counter rotating, coaxial main rotor assembly including an upper rotor assembly with an upper blade and a lower rotor assembly with a lower blade. A first antenna in one of upper blade and the lower blade, and a second antenna in the other of the upper blade and the lower blade. An oscillator to apply an excitation signal to the first antenna. A blade proximity monitor to monitor a magnitude of the excitation signal and an output signal from the second antenna to determine a distance between the upper blade and the lower blade.