Power plants – Reaction motor – Solid propellant
Reexamination Certificate
1998-12-10
2001-03-06
Freay, Charles G. (Department: 3746)
Power plants
Reaction motor
Solid propellant
C060S257000
Reexamination Certificate
active
06195984
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to thrust chamber assemblies for rocket engines.
2. Prior Art
It is known to use ablative liners for rocket engine combustion chambers. U.S. Pat. No. 4,458,595 discloses a solid rocket motor having a layer of silicone rubber and a second layer of an ablative lining placed between the motor casing and the propellant grain. The ablative lining layer contains chopped novoloid fibers 14 microns in diameter and having a nominal length of 1 millimeter interspersed throughout the polymeric composition.
U.S. Pat. No. 5,352,312 discloses a rocket motor insulation made of a liquid crystal polymer such as a wholly aromatic polyester with fillers such as glass or carbon fibers.
U.S. Pat. No. 3,973,397 discloses a rocket motor with an ablative lining made of a terpolymer of ethylene, propylene and a nonconjugated diene and inert fillers such as heavy metal halides, calcium hydroxide and magnesium hydroxide.
SUMMARY OF THE INVENTION
A thrust chamber assembly for liquid fueled rock engines and the method of making it wherein a two-piece mandrel having the configuration of an assembly having a combustion chamber portion connected to a nozzle portion through a throat portion is wrapped with a silica tape saturated with a phenolic resin, the tape extending along the mandrel and covering the combustion chamber portion of the mandrel to the throat portion. The width of the tape is positioned at an angle of 30 to 50° to the axis of the mandrel such that one edge of the tape contacts the mandrel while the other edge is spaced from the mandrel. The phenolic in the tape is cured and the end of the wrap is machined to provide a frustoconical surface extending at an angle of 15 to 30° with respect to the axis of the mandrel for starting a second wrap on the mandrel to cover the throat portion. The remainder of the mandrel is wrapped with a third silica tape having its width positioned at a angle of 5 to 20° from the axis of the mandrel. The resin in the third tape is cured and the assembly is machined to provide a smooth outer surface. The entire assembly is then wrapped with a tow of graphite fibers wetted with an epoxy resin and, after the epoxy resin is cured, the graphite is machined to final dimensions.
REFERENCES:
patent: 3555958 (1971-01-01), Leasure, Jr.
patent: 3973397 (1976-08-01), Chase et al.
patent: 4182495 (1980-01-01), Borgmeier et al.
patent: 4458595 (1984-07-01), Gerrish, Jr. et al.
patent: 5352312 (1994-10-01), Guillot
patent: 5600946 (1997-02-01), Dombrowski et al.
patent: 6047626 (2000-04-01), Lair et al.
Cornelius Charles S.
Counts Richard H.
Lackey Jeffrey D.
Lawrence Timothy W.
Myers W. Neill
Broad, Jr. Robert L.
Freay Charles G.
Gartenberg Ehud
The United States of America as represented by the Administrator
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