Engine Ring Cowlings

The fairing of engines, either with the N.A.C.A. or the Townend type of rings, is becoming more and more the general practice with newly designed or revamped planes. There is a possibility of higher speed without increase of power, combined with a reduction of operating cost. The author points out the differences in the two types of cowling, and gives a description of test results and construction and suggestions for new experiments. Latest changes on several engines show accessories that affect installation of ring cowlings.