Multiple propellent grain for rocket motors

• US 3,217,651 A
• Filed: 11/13/1963
• Issued: 11/16/1965
• Est. Priority Date: 10/31/1960
• Status: Expired due to Term

• Current Assignee: James V. Braun, Willard S. Bacon
• Original Assignee: James V. Braun, Willard S. Bacon
• Inventors: Braun, James V., Bacon, Willard S.
• Application Number:
  US04/323,510
• Time in Patent Office: 734 Days
• US Class Current: 102/287
• CPC Class Codes: C06B 45/12 having contiguous layers or zones
• CPC Class Codes: F02K 9/12 made of two or more portions burning at different rates or having different characteristics

Claims

1. A GENERALLY CYLINDRICAL END BURNING PROPELLENT GRAIN HAVING A FLAT CIRCULAR BASE AT ONE END AND A SEMISPHERICAL PORTION AT THE OTHER END, SAID PROPELLENT COMPRISING TWO CHARGES, ONE OF SAID CHARGES HAVING A FAST AND THE OTHER OF SAID CHARGES HAVING A SLOWER-BURNING RATE, A FIRST CONICAL SLOWER-BURNING CHARGE POSITIONED ALONG THE LONGITUDINAL AXIS OF THE CYLINDRICAL PROPELLENT GRAIN, THE APEX OF THE SAID CONICAL PORTION BEING LOCATED IN THE PLANE OF SAID CIRCULAR BASE, THE BASE OF THE CONICAL PORTION BEING INTEGRAL WITH THE SEMISPHERICAL PORTION, AN ANNULAR FASTBURNING CHARGE SURROUNDING AND IN CONTACT WITH THE CONICAL SLOWER-BURNING CHARGE, SAID FAST-BURNING CHARGE HAVING A BASE PORTION LOCATED IN THE PLANE OF THE SAID CIRCULAR BASE;

SAID ANNULAR FAST-BURNING CHARGE HAVING WALLS NARROWLY TAPERING FROM SAID BASE AND EXTENDING TO SAID SEMISPHERICAL PORTION, A SECOND-SLOWER BURNING ANNULAR CHARGE SURROUNDING AND IN CONTACT WITH SAID FASTBURNING CHARGE, SAID SECOND SLOWER-BURNING CHARGE HAVING A BASE PORTION LOCATED IN THE PLANE OF THE SAID CIRCULAR BASE AND HAVING A NARROWLY TAPERED WALL EXTENDING TO SAID SEMISPHERICAL PORTION.