Rolls-royce Corporation

Mark John Houle

Kenneth Franklin Udall

David Michael Beaven

Peter Allford

A propeller blade retention arrangement having a propeller blade comprising in radial sequence an aerofoil portion, a shank portion and a root portion. The root portion having first cross-sectional area close to the shank portion and second cross-sectional area at the end distal to the aerofoil portion, wherein the second cross-sectional area is greater than the first cross-sectional area. At least two cheeks each having an inner surface arranged to abut the root portion, an outer surface that is threaded and edge surfaces that abut another of the at least two cheeks; wherein the at least two cheeks are arranged to surround the root portion in circumferential abutment. A collar having a threaded inner surface arranged to threadingly engage the outer surfaces of the at least two cheeks.

Propeller blade retention

A gas turbine engine casing includes a tip treatment ring which comprises end supports which support tip treatment bars . Each tip treatment bar is mounted at its ends within the respective end supports by damping elements , which isolate the bar from the end supports . The elements damp vibrations induced in the tip treatment bars so inhibiting the initiation of high cycle fatigue cracking.

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Bristol, United Kingdom

Mark John Houle