Aircraft engine mounts are the large structures that connect the engine to the aircraft. They distribute the weight of the engine evenly, while disseminating the torque and vibration produced. These parts of the plane endure rigorous stress and must be extremely durable.
Most mounts are made from tubular steel chrome-molybdenum that is welded together. This construction allows them to be lightweight while maintaining durability. The mount is then sandblasted, and powder coated in a variety of bright colors (typically white), to allow easy visibility of cracks or defects on its surface.
Modern four-cylinder engines use mounts that share a resemblance to one another. The engine is fastened to the mount in the back or on the underside of the crankcase. Aircraft engine mounts come in a variety of shapes and sizes, including conical mounts, dynafocal mounts, bed mounts, and shock mounts.
Conical mounts are simple to create and assemble. A conical mount has four attachment points, which run parallel with the firewall, and avoid any awkward angles when installing the bolts and shock mounts. One disadvantage of this style is that vibrations caused by the engine torque get transmitted through its frame.
The bracket dynafocal mount has the capability to cushion engine vibration and movement, which results in a significantly lower amount of noise. The engine is fastened by four attachments and require a bit of an angle to function properly. The main drawback of this engine mount is the difficulty in its build, construction, and installation. Bed mounts are more commonly found in a Rotax engine or planes sporting a diesel engine. The engine is mounted using four attachments that are located underneath the crankcase, which then hang onto the firewall.
Shock mounts provide a smooth flight experience. The engine isn’t bolted directly onto the mount as we see in the construction of the other mounts. Instead, stiff rubber shock mounts of varying strengths and thicknesses are used. The addition of the rubber shock mounts soft naturally reduces the amount of vibration and movement, allowing for a much smoother flight and running engine.
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