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Blanking-cap system for an orifice of a duct, in particular for an orifice of an air-intake duct into the combustion chamber of a ramjet. The blanking-cap system (16) includes a glass blanking cap (15) and a destruction device (17) which comprises a projectile (18) capable of destroying the blanking

Blanking-cap system for an orifice of a duct, in particular for an orifice of an air-intake duct into the combustion chamber of a ramjet. The blanking-cap system (16) includes a glass blanking cap (15) and a destruction device (17) which comprises a projectile (18) capable of destroying the blanking cap (15), and a controllable projection means (19), which is capable of projecting the said projectile (18) and which is arranged outside the conduit (7) while being oriented in such a way as to be able to project the said projectile (18) onto the said blanking cap (15).

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1. A blanking-cap system for an inlet orifice of a combustion-air intake duct into a combustion chamber of a ramjet, said ramjet being operable (i) in an initial phase of operation corresponding to a speeding-up of said ramjet, as a rocket by virtue of a consumable auxiliary thruster arranged in sai

1. A blanking-cap system for an inlet orifice of a combustion-air intake duct into a combustion chamber of a ramjet, said ramjet being operable (i) in an initial phase of operation corresponding to a speeding-up of said ramjet, as a rocket by virtue of a consumable auxiliary thruster arranged in said combustion chamber, and (ii) when said ramjet reaches a predetermined speed, as a ramjet proper with injection of fuel and of combustion air into said combustion chamber, and said blanking-cap system including: at least one glass blanking cap that is operable to completely blank off said inlet orifice, during said initial phase of operation as said rocket, and at least one destruction device that is operable to destroy said glass blanking cap to open said inlet orifice for operation as said ramjet, wherein said glass blanking cap blanks off said inlet orifice into said combustion-air intake duct, up-stream thereof in a direction of flow of said combustion air into said combustion-air intake duct, and wherein said destruction device comprises: at least one projectile that is operable to destroy said glass blanking cap when said projectile is projected onto said glass blanking cap, and a controllable projection means for projecting said projectile, said controllable projection means being disposed outside said combustion-air intake duct and oriented to project said projectile onto said glass blanking cap such that, after destruction of said glass blanking cap, said projectile is ejected directly out of said ramjet. 2. The blanking-cap system of claim 1, wherein said controllable projection means is oriented to project said projectile substantially at a center of said glass blanking cap. 3. The blanking-cap system of claim 1, further comprising a straight-line guide forming a channel that guides said projectile, wherein one end of said channel is disposed to face said projection means and another end of said channel is directed towards said glass blanking cap. 4. The blanking-cap system of claim 1, wherein said projection means is a pyrotechnic striker. 5. The blanking-cap system of claim 1, wherein said projectile is a pointed metal bullet. 6. The blanking-cap system of claim 1, wherein said glass blanking cap comprises toughened glass having a rupture stress of at least 190 Mpa. 7. The blanking-cap system of claim 1, wherein said glass blanking cap corresponds to an extension of an outer wall of said ramjet in a region of said inlet orifice. 8. The blanking-cap system of claim 1, further comprising a fixing means, made of elastic material, for fixing said glass blank cap onto said inlet orifice. 9. A ramjet including a combustion chamber, provided with a duct for taking combustion air into a combustion chamber, and a blanking-cap system for an inlet orifice of a combustion-air intake duct, wherein said blanking-cap system is as specified under claim 1. 10. A missile that includes a ramjet according to claim 9.