"Comparison of Hovering Performance of Helicopters Powered by Jet-Propulsion and Reciprocating Engines"

Virginia L. Brightwell, Max D. Peters, and J.C. Sanders, Flight Propulsion Research Laboratory
National Advisory Committee for Aeronautics (NACA)
Predecessor to NASA


....            Actual size is 11 x 8.5-inches

Comparison of Hovering Performance of Helicopters Powered by Jet-Propulsion and Reciprocating Engines

Virginia L. Brightwell, Max D. Peters, and J.C. Sanders, Flight Propulsion Research Laboratory
National Advisory Committee for Aeronautics (NACA)
Predecessor to NASA

This is a rare technical report is of special value to jet propulsion and aircraft engineers, designers, and experimental engine developers, both "amateur" and professional.  It's also an exceptional reference resource for developers of aircraft jet engines--ramjets, pulse jets, gas turbines, and turbojets. dyna-jet dynajet

The book describes in great detail an extensive research and development program for helicopters powered by ramjet and pulsejet engines, immediately after World War II.  It shows how jet-propelled helicopters can lift greater disposable loads, and have other distinct advantages.

The eminent aircraft designer Roy Marquardt, an aeronautical engineering graduate from CalTech who had worked at Northrop during World War II on the B-35 flying-wing bomber project, did much research that contributed to this report. 

(While working on problems cooling the engines of the B-35, which were buried in the wings, he found that the heat generated by the engines produced useful thrust.  This started his interest in the ramjet principle, and in November 1944, he started Marquardt Aircraft in Venice, California.  Marquardt was also a an avid model airplane enthusiast all his life.)

The text investigates compressor air-fed ramjet engines on helicopter rotor tips, pulsejets, Nernst turbine burners, and other innovative experiments.  Complete mathematical calculations for computing rotor performance and hovering time are also included, together with detailed descriptions of Nernst turbines, ram jets, and pulse jets.

There are also chapters devoted to fuel-consumption, hovering time and disposable loads, horsepower ratings, optimum rotor dimensions, and constant rotor-blade chords.  There are also two pages of references for further study.

Originally this document was a closely-guarded military secret (it's original markings of "CONFIDENTIAL" have since been marked over), and our copy was located in an obscure NASA technical library.

Tables, charts, and graphs show all specifications for the test program, and the engineering illustrations present many novel ideas for helicopter rotor design.

[These sample illustrations are at greatly reduced resolution and size]

From 1915 until 1958, the National Advisory Committee for Aeronautics (NACA) carried out much of the cutting-edge research in aeronautics in the United States. 

Originally created in an effort to organize American aeronautical research and raise it to the level of European aviation, from the beginning, NACA emphasized research and development.  By 1920, the NACA had emerged as a small, loosely organized group of leading-edge scientists and engineers.

In 1940, Congress authorized the construction of an aircraft engine research laboratory near Cleveland, Ohio. Dedicated in 1943, it became Lewis Research Center in 1948, named after George Lewis, former NACA director of aeronautical research.  These advanced projects were carried out at the then-new Lewis Laboratories.

NACA was a valuable disseminator of information to designers and manufacturers. Research results distributed by the committee influenced American aviation technology, and its reports served as the basis for many innovations that were built into American civil and military aircraft. 

High-speed flight research after World War II was often a collaboration between the NACA and the U.S. Army Air Force.  In 1945, the U.S. Army Air Forces NACA began the first of a series of experimental aircraft projects, many of which were designed to develop technology for high-speed flight. 

At Lewis, NACA translated German documents on jet propulsion tests that became basic references in this new field of research. Italian and German professionals came to Lewis to work with their American colleagues in these new aspects of flight research.  This book is a report on some of the most important results of NACA research on ramjet and pulsejet applications.

The NACA ceased to exist on October 1, 1958, succeeded by the National Aeronautics and Space Administration (NASA), which was formed largely in response to Soviet space achievements.  NACA became the nucleus of the new agency, and all NACA activities and facilities were folded into NASA.

Very hard to find and now out-of-print, this new limited edition has been republished by the Rocket Science Institute.  It's printed with a high-resolution laser printer (not photocopied) on high-quality, bright-white, acid-free paper and quality bound for years of reference use.  41 pages, large and easy-to-read 11" x 8-1/2" size. 


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