초록 ▼

A cover for an elongated antenna window of a nose cone of a reentry type missile includes a four directional composite material. A respective portion of a plurality of fibers are disposed in each of the four directions. The directions are oriented so that the fibers provide increased resistance to e

A cover for an elongated antenna window of a nose cone of a reentry type missile includes a four directional composite material. A respective portion of a plurality of fibers are disposed in each of the four directions. The directions are oriented so that the fibers provide increased resistance to expected aerodynamic pressure-induced shear forces, especially during reentry, in the plane of the longitudinal axis of the window. The fibers comprise a refractory ceramic such as silica, boron nitride, alumina, aluminum nitride or a combination thereof having a filler material including a refractory ceramic disposed in the interstices between the fibers.

대표청구항 ▼

A method for protecting the environment of a cavity, the cavity disposed internal a structure having a central longitudinal axis and an external aerodynamic surface disposed about the longitudinal axis, the external surface having a meridian, and the structure further having an aperture disposed bet

A method for protecting the environment of a cavity, the cavity disposed internal a structure having a central longitudinal axis and an external aerodynamic surface disposed about the longitudinal axis, the external surface having a meridian, and the structure further having an aperture disposed between the external surface and the cavity, the aperture terminating at the surface in an elongated orifice and at the cavity, the aperture forming an electromagnetic flow communication path between the cavity and surroundings external to the structure, the orifice having a long axis and a shorter axis transverse the long axis, the long axis of the orifice disposed coincident with the meridian of the surface, the method comprising: disposing a dielectric material over the aperture at the orifice, the material having a complementary contour to the orifice for sealingly engaging the margin of the orifice, wherein the material includes a plurality of fibers and further wherein a respective portion of the plurality of fibers are disposed in a repeatable cell substantially in a respective one of four directions, the cell including: a first direction lying in a first plane, the first plane including the central longitudinal axis of the structure and the long axis of the orifice, the first direction substantially parallel to the long axis of the orifice; a second direction lying in a second plane, the second plane substantially perpendicular to the first direction, the second direction substantially parallel to the shorter axis of the orifice; a third direction lying in a third plane, the third plane spaced from and parallel to the first plane, the third direction oblique the first direction; a fourth direction lying in a fourth plane, the fourth plane spaced from and parallel to the first plane and disposed on the opposite side of the first plane from the third plane, the fourth direction oblique the first direction and opposite to the third direction; and the first direction also lying in a fifth plane, the fifth plane spaced from the fourth plane and parallel to the first plane and further disposed on the opposite side of the fourth plane from the first plane; disposing filler material including dielectric material in interstices among the plurality of fibers for supporting the plurality of fibers; and sealing engaging the margin of the orifice with filler material and fibers selected from the group consisting of fibers disposed in the first, third, and fourth directions and any combination thereof, such that elements disposed in the first, third and fourth directions also lie parallel to a plane containing the longitudinal axis and the meridian regardless of the circumferential position of the elongated orifice about the longitudinal axis of the structure.