Abstract: A retention system for a helmet includes a horizontal chin strap and a vertical chin strap, wherein the vertical chin strap is secured to the horizontal chin strap at two points of intersection. The horizontal chin strap may include a first horizontal chin strap portion, a second horizontal chin strap portion, a first fastener for reversibly coupling the first chin strap and the second chin strap, and at least one mounting strap for affixing the mounting strap to a helmet. The vertical chin strap may include a second fastener for reversibly coupling a first end of the vertical chin strap to a body of the vertical chin strap, a loop through which the vertical chin strap passes through, and at least one forward strap for affixing the forward strap to a helmet.

Abstract: A stator vane capable of use in the high temperature environment of a gas turbine engine is disclosed. Various construction details implement vane cooling concepts which are designed to prolong the service life of the vane. An effective leading edge cooling system is built around the uniform flow of film cooling air over the exterior surface of the leading edge from a cavity within the airfoil section of the vane.

Abstract: Apparatus for reducing the pressure loss imposed upon the working medium gases flowing through an exhaust case of a turbine machine is disclosed. Various construction details which reduce the cross flow of secondary air from the pressure side of one case strut to the opposing side of the adjacent strut are developed. The loss reduction system is built around vortex generators which energize the flow boundary layer at the inner wall of the flow path for the working medium gases.