that designer was a mystery,he created a patent between 1920 and 1929,for seaplane,
and he designed a seaplane in 1929,also he designed a 100-passenger Transatlantic
seaplane,14-passenger air transport aircraft and four engined transatlantic aircraft
beside this 60-passenger twin float flying boat.

Of course I know his first work at Sweden and his seaplane of 1919,but who know more.



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Re: Capt. Sundstedt transatlantic flying boat

hesham said:
...but who know more.

Perhaps http://www.aerofiles.com/_st.html ?
His float plane remained the only actually built type. The description of the flying boat as
"twin float flying boat" may be somewhat misleading, I would describe it as a flying boat
with a catamaran hull, so avoiding it to be mistaken for a float plane.


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Re: Capt. Sundstedt transatlantic flying boat

Hello, all -- Happy New Year! Just bought two copies of a magazine called Air World on eBay, and the December 1934 issue had two articles regarding Sundstedt and his airplane projects.

One article provides some bio details. Sundstedt joined the Swedish Royal Navy Corps of Cadets in at the age of 12, became a captain in the Swedish Merchant Marine in 1907 and "began flying with Baron Cederstrom" (?) in 1909. Studied French aircraft factory practices in 1913 and made a non-stop flight from Paris to Stockholm in 1914. Entered the Swedish navy that same year and was detailed to head an aircraft factory in Stockholm. Took a leave of absence and became a French military aviator in 1915, where he taught night flying, supervised aircraft construction, designed pontoons for Farman. Moved to New York in 1916 "to build a seaplane of his own design for trans-Atlantic flying and the result was eventually sold to the [U.S.] Navy." Was with Gallaudet in 1917. Using money provided by Norwegian shipbuilder Hannevig, he began another trans-Atlantic seaplane design in 1918--"one of the largest seaplanes built up to that time, with pontoons of a new design, box beam wing spars, and the first use of balsa wood fairings." Was with Aeromarine in 1921-22, and his design of a night bomber w/an all-metal wing and steel tube fuselage won "the U.S. Government prize." [Anybody know what this refers to?] In 1930 he sold a design for a 40-passenger seaplane "to a foreign government." Here's a picture of him piloting a Farman (see pic #4)

The other article describes a 60-passenger trans-Atlantic seaplane project called the Sundstedt HS-340. The description of the propulsion arrangement is rather vague, saying only that it would use "multiple engines" totaling 4,500 hp and geared together, with each set driving a propeller. Dimensions are span 140', length 88' and height 30'. Gross weight was 62,000 lbs. Two images were included: (see pics #1 & #2)

But the niftiest image was a projected 250-passenger seaplane that would follow upon the HS-340 -- see pic #3. Unfortunately, it's not further identified.


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Re: Capt. Sundstedt transatlantic flying boat

Happy new year Clioman,and great find.
Re: Capt. Sundstedt transatlantic flying boat

Although it's hard to assess from that sketch (Sunstedt 003), that tandem wing
with its long tail looks, as if it inevitably would ditch its tailplane during take-off
and landing.
Re: Capt. Sundstedt transatlantic flying boat

Jemiba said:
Although it's hard to assess from that sketch (Sunstedt 003), that tandem wing
with its long tail looks, as if it inevitably would ditch its tailplane during take-off
and landing.

Assuming it doesn't have retractable floats...
Avimimus said:
Assuming it doesn't have retractable floats...

Indeed, but as there seem to be windows in those catamaran floats, I think, it's quite
unlikely. as that probably wouldn't have allowed access from the upper part then.
I think you are right based upon the other designs in the thread.

I guess they expected it to lift off the water without changing attitude? Maybe relying on wing incidence, an air-cushion forming under the catamaran float to get enough lift?
Well, the idea with the aircushion sounds possible to me, a kind of flying SES then.

I never saw a single engined flying boat Project for him before ?;



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Here is newsreel footage of the Sundstedt-Hannevig Sunrise seaplane being christened by American actress, Erna Steinway, as well as the aircraft taxiing and slowly colliding with a pier.
YouTube - Gaumont Graphic Newsreel: "USA: Swedish pilot crashes plane into dock as transatlantic flight attempt fails" (1910) [sic] [1919 would be the correct year]

Attached are a series of photos of the aircraft posted to Flickr by the US Library of Congress, along with photos of Hugo Sundstedt and aviator Paul Micelli.


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In this film you see Hugo Sundstedt at an air show 1913 in Mora Sweden

Captain Hugo Sundstedt (1886-1966) was one of the aviation pioneers in Sweden and the first pilot to receive his entire flight training in Sweden.

Captain Hugo Sundstedt was one of the aviation pioneers in Sweden during the early 20th century. Among other things, he distinguished himself by breaking the Scandinavian altitude record in 1912 and by becoming the first to fly the Malmö-Stockholm route in 1913.

During this particular time, he performs extensively as a demonstration pilot and makes ascents around the country. In this film you see him at an air show in Mora Sweden 1913

Unlike many others who were involved in flying during the pioneering period, was not killed in an accident but lived a long life. In 1917, he emigrated to the United States where, among other things, he worked on developing hydroplanes, floats, transport planes and wing structures. He formed his own consulting company in these areas in 1934. It was named Sundstedt Aircraft Corporation.
Sundstedt was born as the fourth child of an unmarried woman in Örebro. The family lived in poor conditions and in 1892 he was auctioned off to a shoe dealer for 75 kroner. In 1897 he was adopted by businessman Olof Sundstedt. Now he had the opportunity to study, but since the study results were not good, in 1901 he applied for the Navy as a cadet. After he left the navy in 1904, he got a job in an office in Örebro. Not comfortable behind a desk, he applied for the merchant navy in October 1905, but he mustered out in Cardiff on 19 February 1906. He returned home to Sweden and was employed as a taxi driver in Stockholm in 1908, a job he held until 1911 In Stockholm, he got to know the car dealer Carl Cederström, who took an aviator's diploma in France in 1910, this piqued Sundstedt's interest. He started helping Cederström with the airplane for free, with the ulterior motive of gaining his own experience of flying, and eventually getting a pilot's license himself. He flew for the first time on 1 June 1912 with Cederström's old aircraft Blériot XI Nordstjernan. With some wealthy businessmen from Örebro as sponsors, he managed to buy Nordstjernan from Cederström. During one of his longer flights, on June 21, 1912, he broke the current Scandinavian altitude record, when he reached the top altitude of 1,800 meters during a two and a half hour flight over Malmen. He also pioneered cargo flights, when he airlifted a stack of newspapers. He was supposed to take the certification exams during the month of July, but a fatal accident involving a young woman who was hit by his airplane propeller led to an investigation, which is why the exams were canceled. After the investigation showed that he was innocent, the tests were carried out at the beginning of August 1912. He was thus the first Swede to receive his entire flight training in Sweden and largely on his own without a teacher. He was awarded Swedish aviator diploma number 9 from the Swedish Aeronautical Society (SAS) on 2 August 1912.

Sundstedt was very active as an aviator in 1912 and 1913, he participated in several air shows and made ascents around the country. On August 10, 1913, he made the first flight between Malmö and Stockholm in 14 hours and 35 minutes. In the fall of 1913, he sold the airplane Nordstjernan to Enoch Thulin. During the winter of 1914 he went to France to buy a Farman airplane, during the flight test in April of the airplane he crashed with the result that he had to stay in hospital for a few weeks before he could return to Sweden with his new airplane. He started the journey home in July 1914 from Buc in France and landed on a grass field in Malmö, where the aircraft flipped over. The aircraft was taken to Södertelge Verkstäder where it was to be repaired. When the First World War broke out on August 1, 1914, Sundstedt offered the aircraft to the Navy's Air Force. Both the aircraft and Sundstedt ended up in war service. He was appointed second lieutenant and placed in an air reconnaissance group in Karlskrona. He was active as a naval aviator until 1916, when he retired as a captain. In the fall of 1916, he left Sweden to work as an aviator in France, but since he failed to get any job offer, he continued the journey to the United States on the French steamship L'Espagnole. He stepped ashore in New York Harbor on New Year's Day 1917. In the United States, he worked on hydroplane designs, floats, transport planes and wing designs. In 1919, after spending some years studying meteorology and winds between America and Europe, he decided to construct the Sunset seaplane. With the aircraft, the idea was that he, together with the pilot Paul Micelli, would carry out a flight across the Atlantic with financial support from the banker Christopher Hannevig. During a transfer in the port, the aircraft was damaged and the intended departure had to be postponed due to repairs. It turned out that the economy put an end to further attempts by Sundsted to cross the Atlantic by air.

During the 1920s, Sundstedt worked for several different aircraft manufacturers, mainly with floatplanes. In 1924 he organized the Speed Boat Company. He formed his own consulting company, Sundstedt Aircraft Corporation, in 1934. The company designed a number of seaplanes for other aircraft manufacturers. His surviving writings and letters from 1919 to 1951 are preserved at the Wichita State University Special Archives.

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