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Shell Removes Lead From Light Aircraft Fuel

LONDON, December 3, 2013 /PRNewswire/ --



Shell today became the first major oil company to develop a lead-free replacement for Aviation Gasoline (Avgas 100 and 100LL), which will now begin a strict regulatory approvals process. Avgas is one of the last common transportation fuels to contain lead and is used by light aircraft and helicopters.  Shell's new lead-free formulation comes after 10 years of exhaustive R&D, as well as successful initial testing, carried out in the last two months by two original equipment manufacturers (OEMs).

 

Xinsheng (Sheng) Zhang, Vice-President of Shell Aviation, said: "We are proud of this first for Shell Aviation. This advanced product is the latest milestone in our long history of innovation. We believe that with industry support, a stringent approvals process can be completed for this new lead-free product within a short time-frame. We look forward to working alongside our technical partners and authorities to progress the necessary approvals needed to make this product a reality for use in light aircraft engines of all types."

 

Avgas currently includes lead in its formulation to meet fuel specifications and boost combustion performance (known as Motor Octane rating).  Shell has developed an unleaded Avgas that meets all key Avgas properties and that has a Motor Octane rating of over 100, an industry standard. The development of a technically and commercially-viable unleaded Avgas that meets these criteria has been seen by the aviation industry as a significant challenge, due to the tight specifications and strict flight safety standards that it has to adhere to.

 

To get to this stage, Shell Aviation technologists carried out an intensive internal laboratory programme, including in-house altitude rig and engine testing.  Working alliances were then formed with aviation engine manufacturer Lycoming Engines (Lycoming) and the light aircraft manufacturer Piper Aircraft Inc. (Piper). As a result, the formulation was successfully evaluated in industry laboratory engine (bench) tests by Lycoming and in a flight test by Piper.

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