1994: MY PRIVATE HISTORY OF THE DAVIS-WING II

In 1994  I bought a handsome collection of short biographies of aviation pioneers, from which I quote:

The Wing Man: David R. Davis – 1894(?) – 1972  [1]
“David Davis grew up as a sickly child who was advised to spend as much time outdoors as possible. While a young man, he was sent on an educational camping trip with a tutor, during which they retraced the route of Lewis and Clark. [2]   When he was fifteen he moved to California with his mother. Their home was near Los Angeles where [aviation pioneer] Glenn Martin was experimenting and Davis would often help Martin ground-handle his plane.

“In 1911 Davis made his first flight and four years later he bought his first aeroplane. During World War I he served in the Army.  After the war he became a barnstormer before joining with Donald Douglas in 1920 to start the Davis-Douglas Airplane Company  [Davis put up $40,000.] This venture failed and Davis was completely wiped out with the Stock Market crash in 1929.”

About the period with Douglas, Oliver E. Allen writes in “The Airline Builders:[3]

“…In 1920 Douglas was ready to start his own firm. He went to Southern California with less than $1000 because he felt at home there and one could fly there all year. It was however a bad time to start an aircraft factory anywhere. Douglas tried to borrow money everywhere, until a friend introduced him to David R. Davis, a well to do young man from California who wanted to have an airplane built for a non-stop transcontinental flight.”

04-02366-donald-w-douglas-and-david-r-davis-formed-davis-dou
Donald W.Douglas (left) and David R. Davis [0]
“The two men founded the Davis-Douglas Co. and rented an office. Afterwards they moved to a loft over a lumberyard in Los Angeles. There they constructed the Cloudster. This airplane had one unique property: it was the first plane that could transport a load greater than its own weight.  During the first [attempt of] transcontinental flight the [Liberty] engine broke down and Davis had to crash land at Fort Bliss (Texas). In 1923, when he was ready for a second attempt, two army officers had already completed the non-stop flight with a Fokker T2.  Davis lost interest and withdrew from the company…”

Quoting again from Longyard:
“…Davis took an everyday job to support his family but he never gave up his penchant for airplanes. He tried to develop a variable pitch propeller, but lack of funds hampered his efforts. By the late 1930s, he had developed a theory of aerofoils that he thought could greatly increase the efficiency of wings. He tested model sections mounted on a borrowed car.

Reuben Fleet, founder of Consolidated Aircraft

Through Walter Brookins, he was able to convince Reuben Fleet  [4]
owner of Consolidated Aircraft, of the possibilities inherent in his new wing. Fleet had a wing section tested at the California Institute of Technology where the scientists said the wing was an impossible 102 percent efficient. They disassembled their windtunnel to see what was wrong! Fleet ordered that his next flying boat be built with a ‘Davis Wing’ – a million dollar gamble. In 1939 this plane [the  Model 31 Corregidor] was flown by an amazed test pilot who said it handled like a fighter.”

Altogether not a very complete picture of what exactly went on with the Davis-wing. Remember this was the time before Google, Internet and Wiki. In those days one had to search in libraries and magazines. So imagine what a surprise it was when one day in 1996 I found a letter in the mail from my old friend of Canadian days John Gallipeau, whom I had not seen for thirty years. He had heard of my interest in the Davis wing and he had visited the San Diego Air & Space Museum, where he had found fresh information for me, such as the photograph of two of the principal actors shown above: Donald Douglas and David R. Davis.

Notes
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[0] Picture of Cloudster is shown at the top of the article. Note the big belly needed to store all the fuel.    (Pic credit: Wiki)
[1] The collection of short biographies is from: William H. Longyard, “Who’s Who in Aviation History“, Shrewsbury, Airlife, 1994.
[2]  Two famous explorers, who were sent out by Thomas Jefferson in 1803 to find a route from St.Louis to the Pacific Coast.
[3] Chicago, Time/Life, 1981, here translated from the Dutch edition.

[4] Two more actors had appeared on the scene. Who was Brookins?according to: http://www.oac.cdlib.org/findaid/ark:/13030/kt0489r3ch/):
Walter Richard Brookins was born in Dayton, Ohio, on July 11, 1888. He first knew Orville and Wilbur Wright at the age of four, and was a student of their sister, Katherine, a school teacher. As a teenager he spent much time at the Wright brothers’ bicycle shop, observing them testing their theories, and after their successful first flight the brothers promised Brookins a plane as soon as he was old enough.
Brookins was the first civilian pilot taught to fly by Orville Wright, taking to the air after two and a half hours of instruction, controlling a flight from start to finish on April 30, and flying alone for 12 minutes on May 6.
On July 10, 1910, at Atlantic City, he became the first person to reach an altitude of one mile in an airplane, winning a $5,000 prize for the Wright Company from the Atlantic City Aero Club, and on September 29, 1911, he set an American distance record by flying 192 miles from Chicago to Springfield, IL, making two stops.
Acording to Longyard:
“… During the pre-WW1 years he [Brookins] earned a national reputation as a daring stunt pilot… [He]made the first nightflight in America [1910]… He later established the Brookins Aircraft Coporation in Los Angeles. He unwittingly dramatically affected the course of bombing history when he introduced David Davis to Reuben Fleet, so that Davis might sell Consolidated Aircraft his special wing design.”

Reuben Fleet of course was the legendary founder and owner of the Consolidated Aircraft Corporation. (see also: page 7,  https://ritstaalman.files.wordpress.com/2014/09/laddon-catalina2.pdf)
Originating from Buffalo NY, the firm was moved to San Diego, near the naval base, when Fleet acquired orders for a large number of flying boats for the US Navy.

Much detail about the initial years of Consolidated is given by: Roscoe Creed in: “PBY, The Catalina Flying Boat” (Annapolis, Naval Institute Press, 1986). Creed also describes the Davis-wing trial with the successor to the famous PBY Catalina, which was developed as a private project by Consolidated, under the name Model 31, later Corregidor.

to be continued…

1985: MY PRIVATE HISTORY OF THE DAVIS-WING

I got interested (again) in aviation history when I bought thirty years ago at a jumble sale an old scrap book with photographs of the Dornier Do-X. The picture shown above carried the caption (in Dutch):

1929
THE BIGGEST AIRPLANE IN THE WORLD, the Do X, has recently been completed in the halls of Dornier in Friedrichshafen and will make soon its first test flight. This immense aeroplane has a length of almost forty meters; the span of its wings comes to 48 meters and its height is 8.5 meters. The giant will be propelled by no less than 12 large Siemens Jupiter engines with a total power of 6200 hp. The fuel tanks are in the bottom of the airplane reducing the danger of fire almost completely. The number of passengers that can be transported is astounding: no less than 100!
There is a crew of twenty needed to control the airplane and serve the passengers. The creator of this enormous colossus, Ir. Dornier, has stated that three or four of the engines may be stopped during flight without problems. However, the crossing of the ocean is not yet possible with this giant – it is not more than a step forward on the difficult road to trans-oceanic air traffic. On the photograph the immense monoplane is shown in the assembly hall of the Dornier factory.

The Germans have always been very proud of their Do-X – and rightly so – but of course in 1932, as predicted, it failed where five years earlier Charles Lindbergh had succeeded without apparent effort:
a simple non-stop jump across the Atlantic.


I wondered why this would be so and started to read (+ collect) books about 1930-flying boats and airliners. What were the factors that determined their long-range performance? How fascinating that era was!

Next I got into a correspondence with a certain Don Middleton, a British aviation journalist, who had stated in an English monthly that the amazing long range of the Consolidated Catalina patrol boat was due to its ‘Davis-wing’. Based on general data from Jane’s ‘Fighting Aircraft of WWII’ edition I undertook to compare four contemporary transport planes: the Douglas DC-3 and DC-4, and the Consolidated Catalina and B-24 Liberator, and proved to him that Catalina’s extreme performance was based on two factors: its light construction (empty weight approximately 50% of take-off weight) and its slow cruising speed, which was right at the optimal economic flight point (maximum  CL/CD ratio). The other three planes, for commercial or operational reasons, all cruised faster than their most economic speed and as a consequence had a comparatively shorter range. The Cats were slow, real slow, to the exasperation of their crews. However, slowness could also be advantageous: they were able to shield the ships they were escorting by circling tightly around them, outmaneuvering in this way attacking German and Japanese aircraft that were much faster.

Consolidated PBY Catalina

The PBY Catalina had no Davis-wing and I think I proved it, but Middleton never entered into a serious discussion and suggested I submit my paper to the Royal Aeronautical Society, which of course was a bit much. Later on I learned he disliked smart asses like me who argued from theory: he had been a skilled aircraft worker at de Havillands himself and a RAF engineer during the war.
Of course the Davis-wing was used on the B-24 Liberator. Next blogs will summarize what I know about it. The inventor, David R. Davis, [1] appeals to me because he was obviously a maverick: he worked outside the official circuits of Universities and NACA. Apparently he had a mind of his own.
As a result however, descriptions of his work are hard to find in official literature (like Abbott & Doenhoff; maybe Durand mentions him?). Apparently his wing had extreme low drag at small angles of attack (laminar flow?), which is remarkable, because long range (like Catalina’s) is usually associated with low engine power and therefore relative large angles of attack. So there were things here which were not quite clear to me. I wanted to know more about the wing profile: it must have been very thin with maximum depth near the middle of the chord. How can thin wings be made strong enough for long spans? This was the state of my comprehension (and confusion) until I found more information.

[1] A word of warning: there have been other aviators of fame with the name Davis. So is our man not to be confused with the unfortunate pilot Noel Guy Davis, who crashed short after take-off for a trans-Atlantic flight in 1927, aboard a Keystone Pathfinder (N-X179) airplane called American Legion.
[2] picture: PBY5 Catalina; credit: Wiki.