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The Curtiss JN "Jenny" is a series of biplanes built by the Glenn Curtiss Aeroplane Company of Hammondsport, New York, later the Curtiss Aeroplane and Motor Company. Although the Curtiss JN series was originally produced as a training aircraft for the US Army, the "Jenny" (the common nickname derived from "JN") continued after World War I as a civilian aircraft, becoming the "backbone of American postwar [civil] aviation".<ref>Auliard 2009, p. 44.</ref>

Thousands of surplus Jennys were sold at bargain prices to private owners in the years after the war, and became central to the barnstorming era that helped awaken the US to civil aviation through much of the 1920s.<ref>Rumerman, Judy. "The Curtiss JN-4 "Jenny". U.S. Centennial of Flight Commission, 2003.</ref>

Design and developmentEdit

Curtiss combined the best features of the model J and model N trainers, built for the US Army and US Navy, and began producing the JN or "Jenny" series of aircraft in 1915.<ref>Roseberry 1972, p. 477.</ref> Curtiss built only a limited number of the JN-1 and JN-2 biplanes. The design was commissioned by Glenn Curtiss from Englishman Benjamin Douglas Thomas, formerly of the Sopwith Aviation Company.<ref>Angelucci 1973, p. 41.</ref>

The JN-2 was an equal-span biplane with ailerons controlled by a shoulder yoke in the aft cockpit.<ref>Bowers 1966, p. 7.</ref> It was deficient in performance, particularly climbing, because of excessive weight. The improved JN-3 incorporated unequal spans with ailerons only on the upper wings, controlled by a wheel. In addition, a foot bar was added to control the rudder.<ref name="Donald pp. 279–280">Donald 1997, pp. 279–280.</ref>

File:Curtiss JN-3.jpg
Curtiss JN-3, the progenitor of the JN-4, deployed to Mexico, around 1916<ref name="House p. 168"/>

The 1st Aero Squadron of the Aviation Section, US Signal Corps received eight JN-2s at San Diego in July 1915. The squadron was transferred to Fort Sill, Oklahoma, in August to work with the Field Artillery School, during which one JN-2 crashed, resulting in a fatality.<ref>Larson 2004, pp. 19–20.</ref> The pilots of the squadron met with its commander, Capt. Benjamin Foulois, to advise that the JN-2 was unsafe because of low power, shoddy construction, lack of stability, and overly sensitive rudder. Foulois and his executive officer Capt. Thomas D. Milling disagreed, and flights continued until a second JN-2 crashed in early September, resulting in the grounding of the six remaining JN-2s until mid-October. When two new JN-3s were delivered, the grounded aircraft were then upgraded in accordance with the new design. In March 1916, these eight JN-3s were deployed to Mexico for aerial observation during the Pancho Villa Expedition of 1916–1917.<ref name="House p. 168">House 2003 p. 168.</ref>

After the successful deployment of the JN-3, Curtiss produced a development, known as the JN-4, with orders from both the US Army and an order in December 1916 from the Royal Flying Corps for a training aircraft to be based in Canada.Template:Efn The Canadian version, the JN-4 (Canadian), also known as the "Canuck", had some differences from the American version, including a lighter airframe, ailerons on both wings, a bigger and more rounded rudder, and differently shaped wings, stabilizer, and elevators.<ref name="Molson and Taylor p. 219">Molson and Taylor 1982, p. 219.</ref>

As many as 12 JN-4 aircraft were fitted with an aftermarket Sikorsky wing by the then-fledgling company in the late 1920s.<ref>Story of the Winged S by Igor I. Sikorsky</ref>

Operational historyEdit

File:Curtiss JN-4s.jpg
Curtiss JN-4Ds at Camp Taliaferro, Texas, circa 1918

The Curtiss JN-4 is possibly North America's most famous World War I aircraft. It was widely used during World War I to train beginning pilots, with an estimated 95% of all trainees having flown a JN-4.<ref name="Winchester p. 88"/> The US version was called "Jenny", a derivation from its official designation. It was a twin-seat (student in front of instructor), dual-control biplane. Its tractor propeller and maneuverability made it ideal for initial pilot training with a Template:Convert Curtiss OX-5 V8 engine giving a top speed of Template:Convert and a service ceiling of Template:Convert.<ref name="Donald pp. 279–280"/><ref>"The Engine that Saved Aviation: OX-5." Air Classics, Issue 3, Fall 1965, p. 30.</ref> The British used the JN-4 (Canadian), along with the Avro 504, for their primary World War I trainer using the Canadian Aeroplanes Ltd. indigenous variant.<ref>Molson and Taylor 1982, p. 225.</ref> Many Royal Flying Corps pilots earned their wings on the JN-4, both in Ontario and later in winter facilities at Camp Taliaferro, Texas.<ref>Chajkowsky 1979, p. 55.</ref>

File:JN-4 ambulance.jpg
Converted JN-4 ambulance, operated by the Camp Taliaferro medical teams, around 1918

Although ostensibly a training aircraft, the Jenny was extensively modified while in service to undertake additional roles. Due to its robust but easily adapted structure able to be modified with ski undercarriage, the Canadian Jenny was flown year-round, even in inclement weather.<ref>"Royal Flying Corps Starts Training in Toronto." abheritage.ca. Retrieved: 10 September 2011.</ref> The removable turtle deck behind the cockpits allowed for conversion to stretcher or additional supplies and equipment storage, with the modified JN-4s becoming the first aerial ambulances, carrying out this role both during wartime and in later years.<ref>Hurd and Jernigan 2002, p. 7.</ref> Most of the 6,813 Jennys built were unarmed, although some had machine guns and bomb racks for advanced training. With deployment limited to North American bases, none saw combat service in World War I.

The Curtiss factory in Buffalo, New York, was the largest such facility in the world, but due to production demands, from November 1917 to January 1919, six different manufacturers were involved in production of the definitive JN-4D.<ref name="Winchester p. 88">Winchester 2004, p. 88.</ref> Production from spare or reconditioned parts continued sporadically until 1927, although most of the final orders were destined for the civilian market in Canada and the United States.<ref name="Winchester p. 89">Winchester 2004, p. 89.</ref>

Like the re-engined JN-4H version of the most-produced JN-4 subtype, the final production version of the aircraft was the JN-6, powered by a Wright Aeronautical license-built, 150 hp (112 kW) Hispano-Suiza 8 V-8, first ordered in 1918 for the US Navy. A floatplane version was built for the navy, which was so modified, it was essentially a different airframe. This was designated the N-9. In US Army Air Service usage, the JN-4s and JN-6s were configured to the JNS ("S" for "standardized") model. The Jenny remained in service with the US Army until 1927.<ref name="Winchester p. 88"/>

File:JN-4 and wingwalker.jpg
One of the many daredevil stunts performed by JN-4 pilots was to work with a "wingwalker".

After World War I, thousands were sold on the civilian market, including one to Charles Lindbergh in May 1923, in which he then soloed.<ref>Lindbergh 1927, pp. 39–43.</ref><ref>"Charles Lindbergh's First Solo Flight & First Plane." Charles Lindbergh official site.</ref> Surplus US Army aircraft were sold (some still in their unopened packing crates) for as little as $50, flooding the market.<ref name="Winchester p. 88"/>Template:Efn With private and commercial flying in North America unhampered by regulations concerning their use, pilots found the Jenny's stability and slow speed made it ideal for stunt flying and aerobatic displays in the barnstorming era between the world wars, with the nearly identical Standard J-1 aircraft often used alongside it.Template:Efn Some were still flying into the 1930s.<ref name="Winchester p. 89"/>Template:Efn

JN-4 airframes were used to produce early Weaver Aircraft Company/Advance Aircraft Company/Waco aircraft, such as the Waco 6.<ref name="Winchester p. 89"/>

Notable firstsEdit

Between 1917 and 1919, the JN-4 type accounted for several significant aviation firsts while in service with the US Army Signal Corps Aviation Section and the United States Marine Corps (USMC), including flying the first US Air Mail in May 1918.

In a series of tests conducted at the US Army's Langley Field in Hampton, Virginia, in July and August 1917, the world's first "plane-to-plane" and "ground-to-plane, and vice versa" communications by radiotelephony (as opposed to radiotelegraphy which had been developed earlier) were made to and from modified US Army JN-4sTemplate:Efn by Western Electric Company (Bell Labs) design engineers Lewis M. Clement and Raymond Heising, the developers of the experimental wind generator-powered airborne wireless voice transmitter and receiver equipment.<ref>"Handwritten letter, dated August 18, 1917, from Western Electric Co (Bell Labs) design engineer Lewis M. Clement to Vesta L. Clement, his wife, with a detailed first-person account of the first successful test of 'plane-to-plane' and 'plane-to-ground' radiotelephony from JN-4-d airplanes in flight conducted that day at Langley Field, VA." The Cooper Collection of U.S. Aviation History (Private collection: original letter location), Ardmore, Pennsylvania.</ref><ref>"Lewis Mason Clement: Pioneer of Radio." CPRR.org, September 2010. Retrieved: 5 September 2011.</ref>

In early 1919, a USMC JN-4 was also credited with what is believed to be the first successful dive-bombing attack during the United States occupation of Haiti. USMC pilot Lt Lawson H. Sanderson mounted a carbine barrel in front of the windshield of his JN-4 (previously, an unarmed trainer that had a machine gun mounted in the rear cockpit) as an improvised bomb sight that was lined up with the long axis of his aircraft, loaded a bomb in a canvas mail bag that was attached to the JN-4's belly, and launched a single-handed raid at treetop level, in support of a USMC unit that had been trapped by Haitian Cacos rebels.<ref>"Debunking dive bomber myths." Template:Webarchive Flightpath, Volume 21, Number 4, 17 April 2010.</ref> Although the JN-4 almost disintegrated in the pullout, the attack was effective and led to Sanderson in 1920 developing further dive-bombing techniques to provide Marine pilots with close aerial support to infantry comrades.<ref>Nowarra 1982, p. 8.</ref>

VariantsEdit

File:Curtiss JN-4 CAN.jpg
A JN-4 C227 "Canuck" (USAAS #39158) operated by the US Air Army Air Service in 1918, is now restored and on display at the Canada Aviation and Space Museum.

Although the first series of JN-4s was virtually identical to the JN-3, the JN-4 series was based on production orders from 1915 to 1919.<ref>Auliard 2009, pp. 46–47.</ref>

  • JN-1 — possibly unofficial designation of the second Model J, which served as the prototype for the Model JN.<ref>{{#invoke:citation/CS1|citation

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    • JN-1W — Two aircraft that appear in US Navy records, which may have been confused with the Models S-4 and S-5.
  • JN-2 — first production version, 8 built
  • JN-3 — variant with new unequal-span wings and improved flight controls, 97 built for the RNAS (some sources indicate 91, but serial numbers total 97; 12 built in Canada) plus 2 for the US Army. The six surviving JN-2s were modified to this standard.<ref>{{#invoke:citation/CS1|citation

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  • JN-4A — production version of the JN-4, 781 built
  • JN-4B — This version was powered by an OX-2 piston engine; 76 were built for the US Army, and nine for the US Navy.
  • JN-4C — experimental version, only two were built
  • JN-4 (Canadian) Canuck — Canadian-built version, 1,260 built by Canadian Aeroplanes Ltd. for the RFC in Canada/RAF in Canada and USAAC: Independently derived from the JN-3, it had a lighter airframe, ailerons on both wings, a bigger and more rounded rudder, and differently shaped wings, stabilizer, and elevators. Its use by the USAAC was curtailed as the lighter structure was claimed to cause more accidents than the US-built aircraft, although no air fatalities were attributed to the structural integrity of the type.<ref>Molson and Taylor 1982, pp. 225–226.</ref>
  • JN-4D — improved version, adopting the control stick from the JN-4 (Canadian) 2,812 built
    • JN-4D-2 — One prototype only, the engine mount was revised to eliminate the down thrust position.<ref>Auliard 2009, p. 46.</ref>
  • JN-4H — two-seat advanced trainer biplane with ailerons on both wings, 929 built for the US Army, notable for introducing the use of the Wright Aeronautical license-built Hispano-Suiza 8 V-8 engine for greater power and reliability
    • JN-4HT — two-seat, dual-control trainer version
    • JN-4HB — bombing trainer version
    • JN-4HG — gunnery trainer version
    • JN-4HM — communications conversion of JN-4HT, powered by Wright-Hisso E 150-hp (112-kW), six converted, used to fly the first US Air Mail (May–August, 1918)
  • JN-5H — advanced trainer biplane, only one built
  • JN-6 — improved version of JN-5 trainer biplane series, notably used four ailerons, 1,035 built for the US Army and five for the US Navy<ref name="Auliard p. 47"/>
  • JN-6H — improved version of the JN-6
    • JN-6BH — bomber trainer version
    • JN-6HG-1 — two-seat, dual-control trainer version, 560 built from JN-6 production, 34 for US Navy
    • JN-6HG-2 — single-control gunnery trainer. 90 delivered
    • JN-6HO — single-control observer trainer version, 106 delivered<ref name="Auliard p. 47">Auliard 2009, p. 47.</ref>
    • JN-6HP — single-control pursuit fighter trainer version
  • JNS ("standardized")  — During the postwar years of the early 1920s, between 200 and 300 US Army aircraft were upgraded to a common standard of equipment and modernized.

"Specials"Edit

File:Curtiss Twin JN.jpg
The most radical development of the Curtiss JN-4 was the Twin JN (or "Twin Jenny") in limited production and service with the US military.
  • Allison Monoplane — conversion of JN-4 (Can) G-CAJL by the Allison Company, Kansas, that mounted a parasol wing in place of the biplane configuration, only one conversion made<ref>Molson 1964, p. 62.</ref>
  • Curtiss Stinson Special (1918) — a custom-built, single-seat aircraft for Katherine Stinson, constructed from the fuselage of a Curtiss Model S plus new biplane wings and JN-4 tail surfaces, powered by a 100-hp (74.5-kW) OXX-6<ref name=Bowers1979/>Template:Rp<ref name="Stinson"/>Template:Efn
  • Ericson Special Three — Some reconditioned aircraft built by Canadian Aeroplanes Ltd. were fitted with a third cockpit.<ref name="Winchester p. 88"/>
  • Hennessey Monoplane — <ref>"Hennessey Monoplane." San Diego Air and Space Museum Archives. Retrieved: 6 September 2011.</ref> a 1926 monoplane conversion by James R. Hennessey, three-place transport, 90-hp Curtiss OX-5, span: 36 ft (11 m) length: 25 ft (7.6 m)<ref>"Hennessey." Aerofiles. Retrieved: 6 September 2011.</ref>Template:Citation needed
  • Severski 1926 biplane  — a JN-4 modified with a roller/ski undercarriage, one experimental aircraft converted by the Seversky company<ref name="Severski">"Severski." Aerofiles. Retrieved: 10 September 2011.</ref>Template:Efn
  • Sperry Monoplane — conversion offered by the Sperry Company that mounted a parasol wing in place of the biplane configuration<ref>"Sperry 'Commercial' Wing." Flight, 23 July 1921.</ref>
  • Twin JN — An enlarged twin-engined version of the JN-4, they were powered by two OXX-2 V-8 engines, built in 1916 as the JN-5 for an observation role; among the many other modifications was an enlarged wingspan and new rudder adapted from the Curtiss Model R-4. Two of the series saw action with the US Army on the Mexican border in 1916–1917. A total of eight Twin JNs were built, with two in US Navy service.<ref name="Auliard p. 47"/>

OperatorsEdit

File:KMT雙翼機.JPG
Model of JN-4 used by the Republic of China

Military operatorsEdit

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File:Curtiss JN-4 (Can) dwg.jpg
Drawing of the Curtiss JN-4 (Can) or "Canuck"
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  • Nicaraguan National Guard (1920)
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Civil operatorsEdit

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  • Elliot Air Service, Red Lake, Ontario<ref name="Molson p. 4">Molson 1974, p. 4.</ref>

Surviving aircraftEdit

File:Curtiss Jenny, National Museum of the US Air Force, Dayton, Ohio, USA. (42151813412).jpg
The JN-4D on display at the National Museum of the United States Air Force

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  • 5368 – JN-4D on static display at the Museum of Science and Industry in Chicago, Illinois. It is displayed upside down next to a wraparound balcony, and details of the cockpit can readily be seen. This airframe was built in 1917.<ref>{{#invoke:citation/CS1|citation

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  • 10875 – JN-4C owned by John Shue in York, Pennsylvania.<ref>{{#invoke:citation/CS1|citation

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  • Unknown ID – JN-4 on static display at the Cradle of Aviation Museum in Garden City, New York. This airframe is the aircraft owned by Charles Lindbergh in which he barnstormed long before his transatlantic flight. Lindbergh purchased this aircraft in Americus, Georgia, for $500 in May 1923, and sold it to his flying student in Iowa the following October. It was restored by the late George Dade in the 1970s, and is on loan from the Long Island Early Fliers Club.<ref>{{#invoke:citation/CS1|citation

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  • Unknown ID – JN-4D on display at the Yanks Air Museum in Chino, California.<ref>{{#invoke:citation/CS1|citation

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Specifications (JN-4D)Edit

Template:Aircraft specs

CommemorationsEdit

An image of the Curtis Jenny appeared on the first airmail stamps issued by the U.S. Post Office in 1918

File:1918 -range rtis Jenny BiplaneC1.jpg File:Curtis Jenny 16c 1918 issue.JPG File:US stamp 1918 24c Curtiss Jenny -C3.jpg

The "Inverted Jenny" stampEdit

The "Inverted Jenny" (C-3a) is a 24-cent 1918 US Air Mail postage stamp printing error in which the blue central vignette of US Army Curtiss JN-4HM #38262, the nation's first mailplane, appeared as "inverted" on a single sheet of 100 stamps.Template:Efn

Notable appearances in mediaEdit

In 1921, Lee De Forest made a short film Flying Jenny Airplane in his Phonofilm sound-on-film process. The film depicted a JN-4 flying, and recorded the sound of the Jenny, as well. The short documentary was the first production of the De Forest Phonofilm company.<ref>"Flying Jenny Airplane" (1921). IMDB, Retrieved: 4 September 2011.</ref>

File:Curtiss Jenny plane in Wichita Falls, TX IMG 6857.JPG
This 1917 Curtiss Jenny still flies on occasion. Its home base is the Call Memorial Museum in Wichita Falls, Texas.

Among many later films depicting the barnstorming era when the Jennys "ruled supreme" and played a feature role, was The Spirit of St. Louis (1957) and The Great Waldo Pepper (1974).<ref>Harwick and Schnepf 1989, pp. 57, 60.</ref> In The Court Martial of Billy Mitchell (1955), authentic OX-5 Jennys were showcased as United States Army Air Service training aircraft.<ref>Harwick and Schnepf 1989, p. 55.</ref> Broadcast on April 15, 1987, by PBS, the National Geographic special entitled "Treasures from the Past" featured the restoration and first flight by Ken Hyde of a JN-4D that would go on to win the "Lindy Award" at the EAA AirVenture Oshkosh '87.<ref>Chase, Gene. "From Jets to Jennies: Ken Hyde's Grand Champion Curtiss JN4D." Sport Aviation,Volume 36, No. 11, November 1987, p. 52.</ref>

The stamp also made an appearance in the 1985 film starring Richard Pryor, Brewster's Millions, in which the titular character mails an "Inverted Jenny" stamp as part of a ploy to very quickly and frivolously spend as much money as possible.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

See alsoEdit

NotesEdit

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CitationsEdit

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BibliographyEdit

  • Angelucci, Enzo. Great Aeroplanes of the World. London: Hamlyn, 1973. Template:ISBN.
  • Auliard, Gilles. "Maiden of the Skies." Air Classics, Volume 45, No. 4, April 2009.
  • Bowers, Peter M. "Jenny's Younger Sister." Air Progress, Volume 18, No. 2, February/March 1966.
  • Chajkowsky, William E. Royal Flying Corps: Borden to Texas to Beamsville. Eden Prairie, Ontario, Canada: Boston Mills Press, 1979. Template:ISBN.
  • Donald, David, ed. The Encyclopedia of World Aircraft. London: Aerospace Publishing, 1997. Template:ISBN.
  • Template:Cite magazine
  • Harwick, Jack and Ed Schnepf. "A Viewer's Guide to Aviation Movies". The Making of the Great Aviation Films, General Aviation Series, Volume 2, 1989.
  • House, Kirk W. Hell-Rider to King of the Air. Warrendale, Pennsylvania: SAE International, 2003. Template:ISBN.
  • Hurd, William W. and John G. Jernigan. Aeromedical Evacuation: Management of Acute and Stabilized Patients. New York: Springer Publishing, 2002. Template:ISBN.
  • Jones, A.D. Aerial Mail Service: A Chronology of the Early United States Government Air Mail, March–December, 1918. Mineola, New York: The American Air Mail Society, 1993. Template:ISBN.
  • Larson, Lt. Col. George A., USAF (Ret.). "Hunting Pancho: The 1st Aero Squadron's Air Operations in support of the Army's 1916 punitive expedition." Air Classics, Volume 40, no. 6, June 2004.
  • Lindbergh, Charles A. "WE" New York & London: G.P. Putnam's Sons (The Knickerbocker Press), 1927.
  • Molson, Ken M. "The Canadian JN-4." Canadian Aeronautics and Space Journal, Volume 10, No. 3, March 1964.
  • Molson, K.M. Pioneering in Canadian Air Transport. Winnipeg: James Richardson & Sons, Ltd., 1974. Template:ISBN.
  • Molson, Ken M. and Harold A. Taylor. Canadian Aircraft Since 1909. Stittsville, Ontario: Canada's Wings, Inc., 1982. Template:ISBN.
  • Nowarra, Heinz J. Gezielter Sturz. Die Geschichte der Sturzkampfbomber aus aller Welt (in German). Stuttgart: Motorbuch Verlag, 1982. Template:ISBN.
  • Roseberry, C.R. Glenn Curtiss: Pioneer of Flight, A Biography. Garden City, New York: Doubleday & Company, 1972. Template:ISBN.
  • United States Air Force Museum Guidebook. Wright-Patterson AFB, Ohio: Air Force Museum Foundation, 1975.
  • Winchester, Jim, ed. "Curtiss JN-4 'Jenny'." Biplanes, Triplanes and Seaplanes (Aviation Factfile). London: Grange Books plc, 2004. Template:ISBN.

External linksEdit

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