Search Results

This paper describes an IC engine fuel-system conversion to dual-fuel capability, on a carbureted Cessna 150. This conversion differs from others by adding a fuel injector in parallel to the existing carburetor. The fuel injector pump is activated when switching to ethanol. The advantage is conventional take-off and landing on either fuel with mixture full rich. Altitude leaning remains conventional. This is the first conversion to provide smooth in-flight fuel type change-over at cruise power, if the prescribed procedure is followed. This conversion method is applicable to all carbureted or fuel injected aircraft and automotive engines.

In the course of studying the market requirements for seals in large axles and relating this to conventional sealing technology, it became apparent that a fresh approach to sealing was desirable. This paper describes such a development in detail. Centrifugal action is the principle sealing action of the seal. Although this is in itself not new, the method by which it is harnessed makes the design radically different from normal “slinger” seals. Both practical and analytical work are covered in the text.

The truck wheel seal requirements have changed over the past ten years. Some of the critical requirements for a truck wheel seal in today's environment are: the ability to exclude dust, mud, and water over a wide range of operating conditions; the ability of the elastomeric sealing element to tolerate various aggressive lubricants over a wide range of operating conditions; the ability to provide an adequate OD seal when installed in aluminum housings of various surface finishes; and the ability of the seal to be installed with minimal opportunity for installation damage or improper installation. An improved unitized truck wheel seal was developed to accommodate the above requirements. During the development program, it became obvious that an advanced Nitrile rubber (NBR) formulation was necessary to assist the seal design in accommodating the more demanding performance requirements.