The United States of America As Represented by the Administrator of the

Albert P Sterman, Deceased

Robert J Corsmeier

Dean Thomas Lenahan

Eugene N Tuley

Charles H Gay, Jr

William K Koffel

Raymond E Troeger

An air modulation apparatus, such as for use in modulating cooling air to the turbine section of a gas turbine engine. The apparatus includes valve means disposed around an annular conduit, such as a nozzle, in the engine cooling air circuit. The valve means, when in a closed position, blocks a portion of the conduit, and thus reduces the amount and increases the velocity of cooling air flowing through the nozzle. The apparatus also includes actuation means, which can operate in response to predetermined engine conditions, for enabling opening and closing of the valve means.

Air modulation apparatus

A replaceable tip cap for attachment to the end of a rotor blade. The tip cap includes a plurality of walls defining a compartment which, if desired, can be divided into a plurality of subcompartments. The tip cap can include inlet and outlet holes in walls thereof to permit fluid communication of a cooling fluid therethrough. Abrasive material can be attached with the radially outer wall of the tip cap.

Tip cap for a rotor blade

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Cincinnati, OH, United States of America

Albert P Sterman, Deceased