Knowlege --Outboard Motor

Is Tubes Important in a Turbine Propulsion System?

  • Thursday, 16 September 2021
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Is Tubes Important in a Turbine Propulsion System?

A smooth, rounded inner skin is formed on both sides of the propeller shaft to dampen unwanted noise and vibrations. It is a vital component of a propeller shaft lining, as it not only produces an effective cushion of sound insulation but also allows a smooth flow of oil in the shaft at low pressures. An inner propeller shaft liner made of this rigid material also helps to minimize the noise created by the shaft while it is running. The outer skin is then laminated on the top of the inner skin to complete the mating. The entire process of mating, damping, lamination and then sealing is very quick and easy to perform.

The length of the propeller shaft liner is dependent upon the size of the propeller shaft, the thickness of the shaft and the diameter of the stern tube. To manufacture this liner, a hollow inner skin of polystyrene is first pressed onto the shaft before forming a smooth, rounded inner surface. The outermost tube of paper is then formed into a cylindrical form by axial folds which provide ample space for the formation of paper tubes. The length of these tubes is dependent upon the diameter of the propeller shaft and the degree of detail required. Propeller shaft liners can be custom sized to suit the exact diameter of the shaft bore. The paper tubes must then be rapidly bent into a cylindrical shape, which flattens them to a degree that they do not rotate during operation.

This design permits the introduction of a paper propeller shaft liner into a venturi stream without any significant loss of efficiency due to turbulence. With a typical level of turbulence at the rear of a propeller shaft at approximately thirty miles per hour, this high cae method of eliminating localized turbulence presents no problem at all. In addition to this, the use of a small paper propane torch at the front of the venturi stream and a fan at the rear produces even greater stability than the best level of turbulence at the back of the venturi stream. The ability to precisely control the exit position of the exhaust from the back of the propeller shaft and the position of the fan at the rear allow the production of localized air streams of very low pressure.

These localized airflow formations are channeled along the bottom of a propeller shaft in a planar fashion. This placement results in the reduction of localized turbulent edema at the rear of the propeller shaft, which makes this a significant design consideration. In addition, the use of a small dry propeller shaft liner reduces local turbulence at the forward end of a propeller shaft while also reducing localized pressure changes at the front of the shaft from the back of the propeller shaft at approximately thirty miles per hour. The use of a dry propeller shaft liner allows for a much smaller overall radiator than if water were used, while still maintaining excellent efficiency. Lastly, a dry propeller shaft liner allows for the reduction of the drag effect associated with most spray nozzles.

Dry tube liners can be incorporated into any propane conversion setup as a primary propeller shaft liner or as an add-on if a more radical solution is required. When selecting a propeller shaft liner, you should always consider the possibility of additional tubes that need to be added to the system later down the road. If you add more tubes than are currently included within your system, potential turbulence will be introduced due to increased length. This can add to the amount of time it takes for an airplane to reach its destination and increase the overall cost of operation.

One of the most attractive features of a tubular liner for a gas turbine propane conversion is that the design does not interfere with the normal operation of the turbine. The benefits of a tubular propeller shaft liner include: reduced drag, high efficiency, lowered noise levels and smoother operation. These benefits would allow for the lower cost of operation as well as improved fuel economy and better overall efficiency. The cost of installation and the cost of maintenance for a turbine unit with a tubular propeller shaft liner are both less than those associated with an uninstalled turbine shaft liner.

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