The Southwest Research Institute (SwRI) of San Antonio, TX, says it has successfully tested a new aircraft piston engine that operates on heavy fuels, such as diesel or jet fuel. The demonstration test of the heavy-fuel engine (HFE) was conducted in an unmanned aerial vehicle, or UAV, similar to those used in military reconnaissance missions. Whereas traditional UAVs burn gasoline and therefore require availability of a separate fuel supply, use of HFEs in such applications would help to ...

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