FIELD: rocket construction.
SUBSTANCE: invention relates to rockets engineering and can be used in solid-propellant rocket engines with charges from mixed fuels, attached to housing walls. Fixed solid propellant charge comprises casing, fuel charge and heat-resistant coating with different-height ledges, in longitudinal section having semi-barbell shape and facing inside charge. Height of ledges is varied by charge zones and assigned according to pull out tensions acting in charge with housing attachment specific area. Ledges surface is completely or partially made with fine irregularities with height of 0.05–0.5 mm, and of distance between ledges adjacent along charge length to semi-barbell head diameter ledges ratio is 1.7–2.0.
EFFECT: invention allows to reduce housing with heat-insulating coating weight with simultaneous achievement of fuel to heat-insulating coating guaranteed attachment strength, including dynamic one.
1 cl, 5 dwg
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