Updated March 5, 2025
Orville Wright, in two letters highlighted in this post, wrote of the differing flight control systems on the various models of Wright flyers. The first letter was written to his grand-nephew, George Russel, grandson of Reuchlin and Lulu Wright. Reuchlin and Lulu's daughter Helen married George Nichols Russel October 4, 1908. Helen and George had two daughters, Helen and Elizabeth, and one son, George Milton Russel.
December 31, 1946
"Dear George:
I am glad to hear that your company is getting on so well, and that you have an interesting and worth while job. I was afraid that after the war was over the aeroplane business would drop to less than five per cent. of what it was at its peak during the war.
[George, an aeronautical engineer, worked at Lockheed Aircraft.]
I can hardly imagine that the control of which you speak in your letter is basic and could be covered by a worth while patent. Unless it is basic it would have little money value. However, it may be a better mechanism.
Our machine in 1903 required no separate control for the rudder. The rudder was connected to the wing control and worked simultaneously with it, as described in our original patent."
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1903 Wright Flyer hip wing warping mechanism, Louis Christman drawing H-1, Smithsonian Institution. Note the dashed outline of aviator with hips in cradle, and left hand on elevator lever. (2) |
"In 1908 we applied for a patent on a control in which two levers mounted on the same axle could be grasped in one hand. One lever was for operating the ailerons and the other for operating the rudder. They could be adjusted with reference to each other and were kept in the adjusted position by a friction between the two disks, so that the operation of one lever through the friction operated the other. I used that system at Fort Myer in 1908."
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Sketch by Orville Wright of control system used at Ft. Myer in 1908. (3) |
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Wright Model A Flyer at Ft. Myer, 1908, showing dual lever on one axle control system used by Orville Wright. Image courtesy of Wright State University Core Scholar archives. |
"In 1908 your Uncle Will used a stick. Moving it fore and aft adjusted the rudder, and moving it side-wise moved the ailerons."
"In 1909 I used the system later used on most of the Wright Company's Model B's and other models. The fore and aft movement of a "stick" operated the wing warp or ailerons, and the side movement of a short hinged arm at the top of the stick operated the rudder. This device is illustrated and described in "Aeronautics" of September, 1911, page 96."
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Sketch by Orville Wright of control system used in 1909 "on most of the Wright Company's Model B's and other models." (3) |
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Wright control system as depicted in the Der Motorwagen Rozendaal prints published in 1909. (2) |
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1912 Model C control system from the William J. Hammer Collection, courtesy of the Smithsonian Institution. (5) |
"In 1914 and 1915, we used a wheel control. The wheel was mounted vertically at the top of an upright arm. The fore and aft movement of the arm operated the elevator. Turning the wheel clockwise reduced the angle of the right aileron and increased the angle of the left one. A lever was mounted on the same stud as the wheel, and extended out to and partly around the rim of the wheel forming a hand hold, so that the lever and the rim of the wheel were gripped in one hand. The lever adjusted the rudder. The elevator, the rudder and the ailerons could be operated simultaneously with one hand. The engine throttle and spark controls also were mounted on the same stud as the wheel and rudder lever. All control of plane and motor was done on the one vertical arm. ("Aerial Age", June 14, 1915, June 28, 1915, October 4, 1915.)"
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Wright Model G Flying Boat, 1914 wheel control. Image courtesy of Wright State University Special Collections and Archives, Core Scholar. |
"The French early adopted a stick for control of ailerons and elevator, and a foot bar for the rudder. They thought to get around our patent with that system, but the French Courts decided otherwise. When we went into World War I, the French were using planes by the thousand equipped with the Esnault-Pelterie system described above. Our Government therefore adopted that system so that all machines would be alike.
We used a foot bar control of rudder in a few flights in 1904, but soon abandoned it. From 1908 to 1913 we used one foot to control the speed of the engine.
Wilbur has been with me here in Dayton for more that a month. We haven't got down to real work yet. He has been wallowing in soot getting the shop cleaned up so we can use it. I am intending to do some experimenting on the hydraulic drive, cypher machine, and possibly on the automatic control for planes--maybe some other inventions. I have made no plans for going into manufacturing. All I have in mind at present is to see some of my inventions built and tried. The hydraulic drive no doubt will take years to eliminate the bugs. The cypher machine works and is fun to play with, but probably never would be a business proposition, since the only use for it would be Governmental. Honest people have too little chance in dealing with the Government."
[On December 17, the insulation on the furnace serving Orville's Lab caught fire, and filled the Lab area with soot. Orville's grand-nephew Wilbur Herbert Wright helped with the clean-up.]
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Orville Wright's prototype 1944 Cypher Machine, courtesy of The Franklin Institute Archives. |
"Burma Surgeon Returns" came in good shape, but on account of the many things around the holidays that have to be attended to I haven't been able to read it as yet. That is one of the pleasures reserved for the new year.
Wishing you, Marjorie and little Chaddy the Happiest of New Years,"
Affectionately,
Uncle Orv
Seven months after writing the letter above to his grand-nephew, Orville wrote to Dr. Alexander Wetmore, the sixth Secretary of the Smithsonian Institution.
July 30, 1947
Dr. A. Wetmore, Secretary, Smithsonian Institution, Washington, D.C.
"Dear Doctor Wetmore:
I am sorry to have been so long in answering your letter of June 10th in which you inform me that the Wright 1909 military plane now in the Museum has the split-lever control. I know this control was never at any time used on that plane, but at that time I could not find a clear photograph of the hinged-lever which was used. The split-lever was used only at Kitty Hawk and at Fort Myer in 1908, never afterward."
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Orville Wright and Lt. Thomas Selfridge in 1908 Military Wright Flyer with split lever controls. Courtesy of Wright State University Special Collections and Archives. |
"In the demonstrations at Fort Myer in 1909 I used the hinged-top lever. Wilbur, later in that year at College Park, replaced my control with a stick control which he had previously used in Europe. Lahm, Humphreys and Foulois got their training from him with this stick control. Foulois continued the use of the stick at San Antonio, Texas, but after he saw, at the Belmont Park Meet in October, 1910, the flying of the Wright Company's pilots who were using the hinged-top lever, he had that mechamism [sic] installed on his machine."
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Hinged-top wing warping & rudder lever. (6) |
"The principle of operation was exactly the same in the 1909 Fort Myer lever as in the 1911 lever on the Rodgers plane, now in the Museum. The details of construction, however, were slightly different."
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Wright control system for "headless" machines. (6) |
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Wright Model B with "Blinder" modified at Chicago Meet. (6) |
"After the receipt of your letter I examined with a magnifying glass the photographs made at Fort Myer in 1909, but could not make out from them the exact mechanism used at that time. However, in looking through some of our European photographs a few days ago I found a clear picture showing the construction of the lever as used at Fort Myer.
Since the split-lever was never used on the 1909 military plane I think it should be replace by one of the controls which at one time or another was used on that plane. I believe the device used in the trials at Fort Myer in 1909, and by Foulois at San Antonio in 1910, will be easier to duplicate than the stick control used by Wilbur in training Lahm, Humphreys and Foulois."
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Controller as now installed on the 1909 Wright Military Flyer on display at the Smithsonian. Image courtesy of the National Air and Space Museum. |
"Originally there were two aluminum castings on the split-lever. These same castings were used in the hinged-top lever in 1909. I assume that the split-lever now on the Army machine still has these castings and also a coil spring on the axle to hold the two halves of the split-lever in frictional contact. This spring also was used with the hinged-top lever.
I am inclosing [sic] a sketch of the lever as used in 1909 and 1910. In 1911 the wooden disc was omitted and the rod from the top lever was connected directly onto a slightly modified aluminum casting as used in the Rodgers machine."
Sincerely yours,
Orville Wright
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Sketch of 1909 and 1910 lever enclosed with Orville Wright's July 30, 1947 letter to Dr. A. Wetmore. |
Copyright 2025-Getting the Story Wright
Notes:
- This Author was blessed with the opportunity to obtain this letter directly through the great-grandson of George Milton Russel.
- Wright Brothers 1903 Kitty Hawk Aeroplane National Air Museum, Smithsonian Institution Louis Christman drawing set, 1950, from Author's collection.
- Sketches drawn by Orville Wright on letter to his grand-nephew George Russel, December 31, 1946. From Author's collection.
- From publication of 15 attachments in Der Moterwagen 1909 magazines of Rozendaal's publication. From Author's collection.
- Source is from the William J. Hammer collection with the Smithsonian, but this copy was obtained through personal archive in Author's collection of E.W. Robischon, Asst. Director Information and Education with the National Air and Space Museum, Smithsonian Institution.
- From Scrapbook compiled by James Means, later acquired by E. W. Robischon. From Author's collection.