Recent Developments in Grading Fuels for Aeronautical Use

The subject of fuel grading is somewhat unknown to engine constructors, airplane operators, and others. In dealing with the grading of aviation gasoline, the author, instead of drawing on the great mass of experimental and published data on the subject, with the complexities of each of the component parts, and preparing an exhaustive discussion of one of the components, has chosen to present a general discussion of the factors involved. To this the author has added his opinion of the probable trend in the near future. Some of the points raised are to a degree controversial. The paper also includes a review of recent flight tests with various fuels.