Exhaust nozzle

An exhaust nozzle for a gas turbine engine, the exhaust nozzle comprising a frame extending along a longitudinal axis and the exhaust nozzle comprising:

• a convergent petal pivotably attached at a convergent pivot point to the frame and extending axially downstream and radially inward from the frame;
• a follower roller fixed to the convergent petal on a radially outer side of the convergent petal;
• and
• a cam defining a working surface configured to engage the follower roller to react a force from the convergent petal;
• wherein the cam is movable along a travel in an axial direction to actuate radial movement of the follower roller to pivot the convergent petal, wherein the cam defines a convex working surface such that a contact angle between the follower roller and the cam varies along the travel to thereby vary an axial component of the force reacted by the cam, and
• wherein a ratio of a radius of the follower roller to an average radius of curvature of the cam is 0.05 or above.

An exhaust nozzle for a gas turbine engine, the exhaust nozzle comprising a frame extending along a longitudinal axis and the exhaust nozzle comprising:

• a convergent petal pivotably attached at a convergent pivot point to the frame and extending axially downstream and radially inward from the frame;
• a follower roller fixed to the convergent petal on a radially outer side of the convergent petal;
• and
• a cam defining a working surface configured to engage the follower roller to react a force from the convergent petal;
• wherein the cam is movable along a travel in an axial direction to actuate radial movement of the follower roller to pivot the convergent petal, wherein the cam defines a convex working surface such that a contact angle between the follower roller and the cam varies along the travel to thereby vary an axial component of the force reacted by the cam, and
• wherein a ratio of a radius of the follower roller to a maximum radius of curvature of the cam is 0.2 or below.