Method of producing an expanded insulating layer for propellant charges

US4473517A · kind A · utility

Assignee

• Messerschmitt Bolkow Blohm GmbH · DE

Inventors

• Peter Goedtke · Munich, DE
• Heinz Langer · Kreuztal, DE

Key dates

• Filing date: Jan 4, 1983
• Grant date: Sep 25, 1984
• Expiry date: Jan 4, 2003

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02K9/346
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An insulating layer is effected between a propellant charge in the interior walls of a combustion chamber of a rocket engine by applying an expandable plastic to the inside of the combustion chamber housing between the housing and the outer circumferential wall of the propellant charge then expanding the plastic. Advantageously the combustion chamber is preheated before introducing the charge and the expandable plastic into the combustion chamber. Preferably the ratio of the layer of the thickness of the expandable plastic to the spacing between the propellant charge and the walls of the combustion chamber ranges from 1 to 11/2; 1 to 1 and 1 to 3. The expandable plastic is advantageously a polybutadiene.