Abstract: A sound protection device for reducing the propagation of airborne sound comprises a track system and an elastically deformable, low sound-protecting wall made of rubber or plastic and extending in the longitudinal direction of the track. The sound-protecting wall is arranged at a distance to the track and on the side facing the track has a profile which essentially extends across the entire height of the wall. The side of the protecting wall facing away from the track has a generally even surface. The inner side is inclined at an angle a and the outer side at an angle .beta. to the track, whereby angle .beta. is greater than angle .alpha.. The profile of the inner side consists of a system of lips, which lips points towards the floor of the track at an angle .gamma.. The top of the low sound-protecting wall ends in a lip inclined towards the track, which lip points upwardly at an angle .delta..

Abstract: Apparatus for reducing ground erosion caused by impinging hot jets such as the lifting jets of VSTOL aircraft or rockets, said jets emanating from a hot jet nozzle such as a lift engine nozzle or a lift/propulsion engine nozzle, comprising means for introducing a coolant fluid to an impingement surface immediately beneath the turning zone.

Abstract: A sea wall able to diffuse sheets of wind borne water being blown over the sea wall by a strong wind. The sea wall has a vertically extending barrier, preferably topped by a cap, and wind diverting member mounted above the uppermost surface of the barrier, or cap, if the cap is provided and is disposed above the barrier. The wind diverting member has curved internal air passages gathering air from the water side of the sea wall and discharging air upwardly. The air passages optionally accelerate gathered air by causing the air outlets to be of smaller cross sectional area than that of the air inlets. The sea wall includes drains for disposing of water gathering on the sea wall and the wind diverting member.

Abstract: A modular launch pad for a launch vehicle which comprises a frame and a plurality of building units separably connected to the frame by means of connectors. The building unit comprise a concrete slab and a peripheral frame made of U-shaped channel sections connected to one another to form a frame, wherein the legs of the U are directed inwardly to engage the major surfaces of the slab. At least one of the legs of the channel sections is partially embedded in the slab so that the outer surfaces of the legs lie flush with the portion of the major surface extending between the legs. A plurality of longitudinally and transversely extending reinforcement bars are embedded in the concrete slab and a plurality of connecting means are secured to the slab. The pad has a launch vehicle mount for supporting a launch vehicle and defines exhaust gas channels in flow communication with an exhaust gas opening in the mount.

Abstract: A ground environment mat for VSTOL aircraft and the like, comprising drag elements controlling the effect of laterally transmitted ground jets resulting from jet entry to the mat, so as to reduce hot gas and debris ingestion by the aircraft's air intakes, suck-down on the aircraft's surfaces and ground or deck erosion or heating. The drag elements may comprise or perforated metal twisted flat strips tubes or perforated elements hingedly attached to a backing layer.

Abstract: For the purpose of diminishing intake vortexes at jet engines with turbo-compressors of aircrafts, in particular during test runs, an apparatus is provided, which consists of a grating disposed near the ground below and directly in front of the engine inlet, which grating comprises short, approximately vertically extending wind tunnels.

Abstract: A jet blast deflector fence comprising two curved corrugated deflecting surfaces separated from each other in a common structural framework that is fastened to a concrete foundation, with the taller front deflecting surface open at the bottom to permit the high speed jet exhaust ground layer component to split off and pass through the opening to impinge upon the shorter rear deflecting surface which deflects that component vertically upward to hug the convex rear surface of the front deflector, while the upper slower moving component of the jet blast is guided upwardly by the concave surface of the front deflecting surface such that the two split layers come together in a substantially vertical direction at the discharge edge of the taller deflecting surface to form a vertical air curtain which aerodynamically increases the effective height of the blast deflector.

Abstract: A jet blast deflector fence designed to present a cleaner, simpler, aesthetically pleasing appearance, the deflector fence comprised of simple frames which include only two structural members, a curved rib channel member securedly and hingedly attached to an airport apron and a vertical King post of angle iron which is rigidly secured at its lower end and hingedly attached at its upper end to the channel. A corrugated deflection surface overlies and is fastened to the curved rib members. Because of the respective hinged attachments of the rib members to the apron and the King posts to the rib members the distance between the lower end of the channel member and the King post can be adjusted to reduce the apron space required for the fence. One or more ventilating slots are included to reduce turbulence in order to improve deflection performance.

Abstract: A takeoff and landing platform for V/STOL aircraft has features to reduce ground effect. The platform has a plurality of vanes mounted above a flat horizontal surface. Each of the vanes is curved to turn the jet stream from the vertical. The upper edges of all the vanes lie in a plane that is parallel with the horizontal surface. This plane is located at a distance from the horizontal surface that is about 0.5 to about 2.0 times the engine nozzle diameter at takeoff and landing of the type aircraft that use the platform.

Abstract: A blast deflecting fence having separate upper and lower deflecting surfaces which overlap. The lower deflecting surface is curved so that a jet blast directed towards it is deflected upwards. The upper deflecting surface is positioned so that lower portion of the upper surface overlaps the upper portion of the lower surface and is horizontally separated therefrom. The upper deflecting surface is inclined between 30.degree. below the vertical and vertical so that jet blasts are directed upwards. End walls are provided perpendicular to the blast fence to constrain the lengthwise flow of exhaust gases.

Abstract: A method of camouflaging at least one surface of at least one building is disclosed herein and utilizes an elongated support bar of nonlinear and preferably also nonsymmetrical configuration. This support bar is fixedly maintained along the length of and to one side of the surface to be camouflaged and is provided for supporting a net having a topside including artificial garnish supported thereon and a bottomside which, also includes artificial garnish in a preferred embodiment. This net is attached to the elongated support bar along an edge which conforms in configuration to the bar and extends over the surface to be camouflaged with its top garnish supporting side exposed to the surroundings.