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Following the 1917 recommendation of the Bolling Airplane Mission that great energy be devoted to the development of means to maintain a high proportion of the power of airplane engines at great altitudes, some very creditable work was done. A recent flight test at 20,000-ft. altitude indicates a resultant marked increase in airplane performance. Interest in this development should be extended. The purpose of the paper is to indicate the possibilities and limitations of increasing airplane speed by introducing means to maintain high engine power at great altitudes. The DeHaviland-Four is selected as being, an airplane typical of present practice and the performances that might be obtained at different altitudes are approximately computed, with various assumed ratios of the actual engine power at the altitude to the total weight of the airplane in every case. The accompanying series of curves give the various coefficient results.