Investigation of the Muffling Problem for Airplane Engines
This 1920 technical report from the National Advisory Committee for Aeronautics, catalogued by NASA's Technical Reports Server, documents engineering trials on exhaust muffler designs for airplane engines, written for aircraft engineers and designers. Its pictures are precise line drawings of muffler elevations, sections and cutaway views with dimensioned callouts and perforation patterns, offering a designer clear mechanical diagrams of tubular, conical and cylindrical forms and their hole layouts.
