US 7,578,122 B1
	Rocket motor case using plank sections and method of manufacture
Irving Edward Figge, Sr., Manassas, Va. (US); and Phillip Henry Graham, Warrenton, Va. (US)
Assigned to Aerojet General Corporation, Redmond, Wash. (US)
Filed on Feb. 26, 1997, as Appl. No. 8/811,598.
Application 08/811598 is a continuation of application No. 08/393776, filed on Feb. 24, 1995, abandoned.
Int. Cl. F02K 9/08 (2006.01)

U.S. Cl. 60—255

8 Claims

1. A rocket motor case plank section for use in making a rocket motor case having an end closure and being overwrapped with sheet material, said plank section comprising a plank body having a plank leg extending between first and second ends thereof, each of the first and second ends having opposed sides separated by a defined width and having upper and lower surfaces which are curved in shape so that a plurality of plank bodies joined together at the sides thereof form a cylinder corresponding to said rocket motor case, said plank leg having a width less than said defined width of said first and second ends so that adjacent plank legs form a venting space therebetween for release of pressure from within said rocket motor case, said plank body being configured to attach to an end closure of said rocket motor case and having means on the outer surface thereof for forming a stop for the overwrapped sheet material.