Hughes H-4 Hercules

{{Short description|American World War II heavy flying boat}} {{Redirect|HK-1}} {{Use mdy dates|date=March 2021}} {{Use American English|date=March 2021}} {{Infobox aircraft |name= Hughes H-4 Hercules ''Spruce Goose'' |image = File:H-4 Hercules 2.jpg |caption = |type = Heavy transport flying boat |national_origin = United States |manufacturer = Hughes Aircraft |designer = Howard Hughes |first_flight = November 2, 1947 ({{Age in years|1947|11|02}} years ago) |introduction= 1947 |retired = |status = Preserved |primary_user = |produced = 1947 |number_built = 1 | flights = 1 |developed_from = |variants =  |fate = Preserved |preservation = Evergreen Aviation & Space Museum }}

The '''Hughes H-4 Hercules''' (commonly known as the '''''Spruce Goose'''''; registration NX37602) is a prototype strategic airlift flying boat designed and built by the Hughes Aircraft Company. Intended as a transatlantic flight transport for use during World War II, it was not completed in time to be used in the war. The aircraft made only one brief flight, on November 2, 1947, and the project never advanced beyond the prototype.

Built from wood (Duramold process) because of wartime restrictions on the use of aluminum and concerns about weight, the aircraft was nicknamed the ''Spruce Goose'' by critics, although it was made almost entirely of birch.<ref name="Parker 49-58">Parker, Dana T. ''Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II,'' pp. 49–58, Cypress, CA, 2013. {{ISBN|978-0-9897906-0-4}}.</ref><ref>[http://www.theaviationzone.com/factsheets/hk1.asp "Hughes HK-1 (H-4) 'Spruce Goose'."] ''The Aviation Zone''. Retrieved October 6, 2010.</ref> The ''Birch Bitch'' was a more accurate but less socially acceptable moniker that was allegedly used by the mechanics who worked on the plane.<ref>[https://www.flyingmag.com/when-the-spruce-goose-took-flight/ "When the ‘Spruce Goose’ Took Flight."] ''Flying Mag''. Retrieved December 9, 2023.</ref> The Hercules is the largest seaplane ever built, and it had the largest wingspan of any aircraft ever flown until the twin-fuselaged Scaled Composites Stratolaunch first flew on April 13, 2019.<ref>[http://www.evergreenmuseum.org/the-museum/aircraft-exhibits/the-spruce-goose/ ''Spruce Goose''.] {{Webarchive|url=https://web.archive.org/web/20150927201715/http://evergreenmuseum.org/the-museum/aircraft-exhibits/the-spruce-goose/ |date=September 27, 2015 }} ''Evergreen Aviation & Space Museum''. Retrieved December 14, 2011.</ref><ref>{{cite web|url=https://www.flightglobal.com/news/articles/stratolaunch-airborne-in-first-flight-of-worlds-lar-457453/|title=Stratolaunch airborne in first flight of world's largest aircraft|date=13 April 2019|website=Flightglobal.com|access-date=13 April 2019}}</ref> The aircraft remains in good condition. After being displayed to the public in Long Beach, California, from 1980 to 1992, it was moved to display at the Evergreen Aviation & Space Museum in McMinnville, Oregon, United States.<ref>Parker, Dana T. ''Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II,'' p. 55, Cypress, CA, 2013. {{ISBN|978-0-9897906-0-4}}.</ref> It was listed on the National Register of Historic Places in 2024.<ref>{{cite web|url=https://www.nps.gov/subjects/nationalregister/weekly-list-2024-10-25.htm|title=Weekly List of Actions Taken on Properties: 10/15/2024 Through 10/25/2024|publisher=National Park Service|accessdate=2024-10-28}}</ref>

==Design and development== [[File:HughesH-4 DC-3 Comparison.JPG|left|thumb|upright=1.5|Size comparison between the H-4 and a Douglas DC-3]]

In 1942, the U.S. War Department needed to transport war materiel and personnel to Britain. Allied shipping in the Atlantic Ocean was suffering heavy losses to German U-boats, so a requirement was issued for an aircraft that could cross the Atlantic with a large payload. Wartime priorities meant the aircraft could not be made of strategic materials (e.g., aluminum).<ref>Parker, Dana T. ''Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II,'' pp. 49, 51, Cypress, CA, 2013. {{ISBN|978-0-9897906-0-4}}.</ref>

The aircraft was the brainchild of Henry J. Kaiser, a leading Liberty ship builder and manufacturer. Kaiser teamed with aircraft designer Howard Hughes to create what would become the largest aircraft yet built. It was designed to carry {{convert|150000|lb|kg}}, 750 fully equipped troops or two 30-ton M4 Sherman tanks.<ref name="Boeing H-4">{{cite web|url=http://www.boeing.com/boeing/history/boeing/h4_hercules.page |title=H-4 Hercules Flying Boat |publisher=Boeing |date=1947-11-02 |access-date=2014-06-24}}</ref> The original designation "HK-1" reflected the Hughes and Kaiser collaboration.<ref name="Odekirk II"/>

The HK-1 aircraft contract was issued in 1942 as a development contract<ref name="McDonald 45">McDonald 1981, p. 45.</ref> and called for three aircraft to be constructed in two years for the war effort.<ref>Odekirk 1982, p. 1V.</ref> Seven configurations were considered, including twin-hull and single-hull designs with combinations of four, six, and eight wing-mounted engines.<ref>McDonald 1981, pp. 41–44.</ref> The final design chosen was a behemoth, eclipsing any large transport then built.<ref name="McDonald 45"/><ref name="McDonald 40">McDonald 1981, p. 40.</ref>{{refn|Quote: "Kaiser announces the most monumental program in the history of aviation."|group=N}} It would be built mostly of wood to conserve metal (its elevators and rudder were fabric-covered),<ref name = "Winchester 113">Winchester 2005, p. 113.</ref> and was nicknamed the ''Spruce Goose'' (a name Hughes disliked) or the ''Flying Lumberyard''.<ref name="McDonald 58-59"/>

While Kaiser had originated the "flying cargo ship" concept, he did not have an aeronautical background and deferred to Hughes and his designer, Glenn Odekirk.<ref name="McDonald 40"/> Development dragged on, which frustrated Kaiser, who blamed delays partly on restrictions placed for the acquisition of strategic materials such as aluminum, and partly on Hughes' insistence on "perfection."<ref name="McDonald 56">McDonald 1981, p. 56.</ref> Construction of the first HK-1 took place 16 months after the receipt of the development contract. Kaiser then withdrew from the project.<ref name="McDonald 58-59">McDonald 1981, pp. 58–59.</ref><ref>Herman, Arthur. ''Freedom's Forge: How American Business Produced Victory in World War II,'' pp. 277–281, Random House, New York. {{ISBN|978-1-4000-6964-4}}.</ref>

thumb|right|Rearward view of the Hercules H-4's fuselage

Hughes continued the program on his own under the designation ''H-4 Hercules'',{{refn|The Hughes design was initially identified as the HFB-1 to signify "Hughes Flying Boat, First Design".<ref name = "Winchester 113"/>|group=N}} signing a new government contract that now limited production to one example. Work proceeded slowly, and the H-4 was not completed until well after the war was over. The plane was built by the Hughes Aircraft Company at Hughes Airport, location of present-day Playa Vista, Los Angeles, California, employing the plywood-and-resin "Duramold" process<ref name = "Winchester 113"/>{{refn|The Hughes Corporation had used the duramold process, which laminated plywood and resin into a lightweight but strong building material that could be shaped.|group=N}} – a form of composite technology – for the laminated wood construction, which was considered a technological ''tour de force''.<ref name="Odekirk II">Odekirk 1982, p. II.</ref> The specialized wood veneer was made by Roddis Manufacturing in Marshfield, Wisconsin. Hamilton Roddis had teams of young women ironing the (unusually thin) strong birch wood veneer before shipping to California.<ref>[http://www.marshfieldnewsherald.com/article/20131023/MNH01/310230453/Marshfield-women-recall-building-engineering-marvels-skies?nclick_check=1 Marshfield women recall building engineering marvels of the skies] {{webarchive|url=https://web.archive.org/web/20141217024344/http://www.marshfieldnewsherald.com/article/20131023/MNH01/310230453/Marshfield-women-recall-building-engineering-marvels-skies?nclick_check=1 |date=2014-12-17 }}, Marshfield News Herald</ref>

A house moving company transported the airplane on streets to Pier E (now Pier T<ref name="Pier renamed">{{cite web |title=The History of the Goose and the Crane by Geraldine Knatz, Ph.D. |url=https://www.palosverdespulse.com/blog/2021/1/12/the-goose-and-the-crane-by-geraldine-knatz-phd |website=Palos Verdes Pulse |access-date=3 October 2022}}</ref>) in Long Beach, California. They moved it in three large sections: the fuselage, each wing—and a fourth, smaller shipment with tail assembly parts and other smaller assemblies. After Hughes Aircraft completed final assembly, they erected a hangar around the flying boat, with a ramp to launch the H-4 into the harbor.<ref name="Parker 49-58"/>

Howard Hughes was called to testify before the Senate War Investigating Committee in 1947 over the use of government funds for the aircraft. During a Senate hearing on August 6, 1947 (the first of a series of appearances), Hughes said:

<blockquote>The Hercules was a monumental undertaking. It is the largest aircraft ever built. It is over five stories tall with a wingspan longer than a football field. That's more than a city block. Now, I put the sweat of my life into this thing. I have my reputation all rolled up in it and I have stated several times that if it's a failure, I'll probably leave this country and never come back. And I mean it.<ref>''The Great Aviator: Howard Hughes, His Life, Loves & Films{{snd}}A Documentary''. Los Angeles: Delta Entertainment Corporation, 2004.</ref>{{refn|Hughes' Senate Hearings testimony is now in the public domain.|group=N}}</blockquote>

In all, development cost for the plane reached $23 million (equivalent to ${{Inflation|US-GDP|23|1947 |fmt=c|r=0}} million in {{Inflation-year|US-GDP}} dollars).<ref name="programcost">{{cite web|url=http://www.history.com/this-day-in-history/spruce-goose-flies|title=This Day in History: November 2 | website=History.com|date=November 24, 2009 |publisher=A&E Television Networks, LLC|access-date=14 February 2017}}</ref>

==Operational history== thumb|right|The flight deck of the H-4, 2010

Hughes returned to California during a break in the Senate hearings to run taxi tests on the H-4.<ref name = "Winchester 113"/> On November 2, 1947, the taxi tests began with Hughes at the controls. His crew included Dave Grant as copilot, two flight engineers, Don Smith and Joe Petrali, 16 mechanics, and two other flight crew. The H-4 also carried seven invited guests from the press corps and an additional seven industry representatives. In total, thirty-six people were on board.<ref>McDonald 1981, pp. 78–79.</ref>

Four reporters left to file stories after the first two taxi runs while the remaining press stayed for the final test run of the day.<ref>McDonald 1981, pp. 85–87.</ref> After picking up speed on the channel facing Cabrillo Beach, the Hercules lifted off, remaining airborne for 26 seconds at {{convert|70|ft|abbr=on}} off the water at a speed of {{convert|135|mph}} for about one mile (1.6 km).<ref>Francillon 1990, pp. 100, 102.</ref> At this altitude, the aircraft still experienced ground effect.<ref>[http://www.se-technology.com/wig/html/main.php?open=aero "Wing In Ground effect aerodynamics."] {{webarchive|url=https://web.archive.org/web/20070927091031/http://www.se-technology.com/wig/html/main.php?open=aero |date=2007-09-27 }} ''se-technology.com.'' Retrieved: October 6, 2010.</ref> To Hughes, these tests demonstrated that the now-unneeded plane was flight-worthy, and thus worth the use of government funds.<ref>[http://www.life.com/gallery/34722/howard-hughes--the-spruce-goose#index/18 "Howard Hughes & The Spruce Goose."] {{Webarchive|url=https://web.archive.org/web/20110829084652/http://www.life.com/gallery/34722/howard-hughes--the-spruce-goose#index/18 |date=August 29, 2011 }} ''Life'', October 27, 2009. Retrieved: August 28, 2011.</ref>

The H-4 never flew again after its first test flight. Because World War II had ended, the military no longer needed it to carry troops or equipment across the ocean. Its lifting capacity and ceiling were never tested. Afterwards a full-time crew of 300 workers, all sworn to secrecy, maintained the aircraft in flying condition in a climate-controlled hangar. The company reduced the crew to 50 workers in 1962 and then disbanded it after Hughes' death in 1976.<ref>Dean, Paul. "The Man Who Keeps The Spruce Goose." ''Los Angeles Times'', April 21, 1983, p. J1.</ref><ref name="Noah">{{cite book |last1=Dietrich |first1=Noah |last2=Thomas |first2=Bob |title=Howard, The Amazing Mr. Hughes |date=1972 |publisher=Fawcett Publications, Inc. |location=Greenwich |pages=209–216}}</ref>

==Display== [[File:Hughes H-4 Hercules flying boat, the "Spruce Goose" at the Evergreen Aviation & Space Museum.jpg|thumb|upright=1.5|H-4 Hercules at Evergreen Aviation & Space Museum. A Douglas DC-3 parked beneath its wing shows the scale of the H-4.]]

Ownership of the H-4 was disputed by the U.S. government, which had contracted for its construction. In the mid-1970s, an agreement was reached whereby the Smithsonian Institution's National Air and Space Museum would receive the Hughes H-1 Racer and section of the H-4's wing, the Summa Corporation would pay $700,000 and receive ownership of the H-4, the U.S. government would cede any rights, and the aircraft would be protected "from commercial exploitation."<ref>{{citation | title = Proceedings of the Annual Meeting of the Board of Regents, Smithsonian Institution | date = January 24, 1975 | publisher = Smithsonian Institution | page = 91 | quote = For over two years the General Services Administration has been negotiating with Summa Corporation (formerly the Hughes Tool Co.) concerning the disposition of the experimental wooden cargo plane known as the "HK-1" that was constructed by Howard Hughes' company in the 1940s under a Government contract. The "HK-1" is of historic interest, but it is an enormous aircraft presenting major housing and maintenance problems. Within the last few months the Smithsonian has been drawn into these negotiations because of the National Air and Space Museum's interest in the "HK-1" and in another aircraft owned by Summa called the "Hughes Racer." GSA, Summa, and SI are now exploring the feasibility of an arrangement whereby GSA will transfer its rights to the "HK-1" to the Smithsonian, and the Smithsonian will exchange the "HK-1" with Summa in return for a model of the "HK-1" suitable for museum display, the "Hughes Racer," and $600,000. Such an arrangement will also settle any dispute between GSA and Summa regarding existing ownership rights in the "HK-1" and will protect the "HK-1" from commercial exploitation. | url = https://transcription.si.edu/transcribe/9724/SIA-SIA_000001_BORMTG_19750124_088}}</ref><ref>{{cite web | url = https://siarchives.si.edu/collections/siris_sic_1278 | title = Spruce Goose Acquired by NASM | date = 1975 | work = Smithsonian Institution Archives | publisher = Smithsonian Institution | access-date = May 12, 2017 | quote = Summary: The National Air and Space Museum acquires the Hughes Flying Boat, HK-1, "Spruce Goose," from the U.S. General Services Administration. The museum decided to retain a 51-foot wing section and return the rest of the craft to the builder, the Hughes Tool Company (now the Summa Corporation). The Summa Corporation donated $700,000 and the historic Hughes Racer (in which Howard Hughes established world records in 1935 and 1937), and made portions of the aircraft available to eight public museums selected from a list compiled by the Smithsonian. }}</ref>

A plan to dismantle the aircraft and offer portions of it to various museums was put forward in May 1980.<ref>{{cite news |title=Hughes' Spruce Goose to Be Disassembled |url=http://www.newspapers.com/newspage/62359682 |access-date=9 November 2025 |work=Santa Cruz Sentinel |agency=AP |date=22 May 1980 |page=58}}</ref> A group called the Committee to Save the Hughes Flying Boat was formed to prevent this and the following week Los Angeles County announced that it wanted it to be displayed intact.<ref>{{cite news |last1=Dean |first1=Paul |last2=Gore |first2=Robert J. |title=Long Beach Question: Is the Goose Finally Cooked? |url=http://www.newspapers.com/newspage/386353368 |access-date=9 November 2025 |work=Los Angeles Times |date=20 May 1980 |pages=1, 6-7}}</ref><ref>{{cite news |last1=Mead |first1=Thom |title=County Wants Spruce Goose Displayed Intact |url=http://www.newspapers.com/newspage/606667912 |access-date=9 November 2025 |work=News-Pilot |agency=Copley News Service |date=28 May 1980 |page=A2}}</ref>

[[File:The Queen Mary March 2020 by Don Ramey Logan.jpg|thumb|The "Spruce Goose Dome" next to the RMS ''Queen Mary'' in Long Beach]] [[File:Historic Willamette Falls Locks photo (29060778410).jpg|thumb|The H-4 Hercules fuselage in transport near the Willamette Falls Locks on its way to McMinnville, Oregon in 1992.]]

In 1980, the H-4 was acquired by the Aero Club of Southern California, which later put the aircraft on display in a very large geodesic dome next to the ''Queen Mary'' ship exhibit in Long Beach, California. The large dome facility became known as the '''Spruce Goose Dome'''. The very large enclosed indoor dome area around the H-4 consisted of meeting and special event space, elaborate audio-visual displays about Howard Hughes and the aircraft itself, and dining areas for tourists. Many convention groups held large dinners, sales meetings, and even concerts under the wings of the aircraft at night when the Spruce Goose Dome was closed to tourists. In 1986, a secondary simulator-style attraction named Time Voyager was constructed next to the H-4, at a cost of $2.5 million (~${{Format price|{{Inflation|index=US-GDP|value=2500000|start_year=1986}}}} in {{Inflation/year|US-GDP}}).<ref>{{cite news |last1=Bailey |first1=Eric |title=Next to Queen Mary, Spruce Goose : Time Travel Ride to Be New Harbor Attraction |url=https://www.latimes.com/archives/la-xpm-1985-07-14-hl-6678-story.html |access-date=10 February 2020 |work=Los Angeles Times |date=14 July 1985}}</ref> In 1988, The Walt Disney Company acquired both Long Beach attractions and the associated Long Beach real estate by Pier J. In 1991, Disney informed the Aero Club of Southern California that it no longer wished to display the Hercules aircraft after its highly ambitious Port Disney plan was scrapped.

[[File:Hughes H-4 Hercules ("Spruce Goose").jpg|thumb|Hughes H-4 Hercules at Evergreen Aviation & Space Museum]]

After a long search for a suitable host, the Aero Club of Southern California arranged for the Hughes Hercules flying boat to be given to Evergreen Aviation & Space Museum in exchange for payments and a percentage of the museum's profits.<ref>{{cite web|url=http://www.oregonlive.com/business/index.ssf/2013/12/future_of_evergreen_air_space.html#incart_river_default |title=Evergreen Aviation & Space Museum's future in doubt as creditors claim Spruce Goose, other planes |publisher=OregonLive.com |date= 2013-12-20|access-date=2014-06-24}}</ref> The aircraft was transported by barge, train, and truck to its current home in McMinnville, Oregon (about {{convert|40|mi|km|abbr=}} southwest of Portland), where it was reassembled by Contractors Cargo Company and is currently on display. The aircraft arrived in McMinnville on February 27, 1993, after a 138-day, {{convert|1055|mi|km|adj=on}} trip from Long Beach. The Spruce Goose geodesic dome is now used by Carnival Cruise Lines as its Long Beach terminal.

By the mid-1990s, the former Hughes Aircraft hangars at Hughes Airport, including the one that held the Hercules, were converted into sound stages. Scenes from movies such as ''Titanic'', ''What Women Want'' and ''End of Days'' have been filmed in the {{convert|315000|sqft|m2|abbr=|adj=on}} aircraft hangar where Howard Hughes created the flying boat. The hangar will be preserved as a structure eligible for listing in the National Register of Historic Places in what is today the large light industry and housing development in the Playa Vista neighborhood of Los Angeles.<ref>Freeman, Paul. [https://www.airfieldsfreeman.com/CA/Airfields_CA_LA_W.htm#hughes "Hughes Airport."] ''Abandoned & Little-Known Airfields: California, Western Los Angeles area,'' October 10, 2012.</ref> It has since been converted to office and event space by Google.<ref>{{Cite web |title=Historic Hangar becomes History-making Workplace for Google {{!}} ZGF |url=https://www.zgf.com/work/404-google-spruce-goose |access-date=2022-07-25 |website=www.zgf.com}}</ref><ref>{{Cite magazine |date=November 2021 |title=A Face Lift for the Spruce Goose |url=https://www.structuremag.org/?p=19110 |magazine=Structure Magazine |access-date=2022-12-01}}</ref>

==Specifications (H-4)== {{More citations needed section|date=February 2023}} ''Performance specifications are projected.'' thumb|Size comparison of the Hughes H-4 against other large aircraft {{Aircraft specs |ref= |prime units?=imp  |crew=3 |capacity= |length ft=218 |length in=8 |length note= |span ft=319 |span in=11 |span note= |height ft=79 |height in=4 |height note= * '''Fuselage height:''' {{cvt|30|ft|1}} |wing area sqft= |wing area note= |aspect ratio= |airfoil= |empty weight lb=250000 |empty weight note= |gross weight lb= |gross weight note= |max takeoff weight lb= |max takeoff weight note= |fuel capacity= |more general=  |eng1 number=8 |eng1 name=Pratt & Whitney R-4360 Wasp Major |eng1 type=28-cylinder air-cooled radial piston engines |eng1 hp=3000 |eng1 note=

|more performance=

|avionics= }} [[File:Pratt & Whitney R-4360 Wasp Major 1.jpg|thumb|Pratt & Whitney R-4360 Wasp Major engine]]

==Notable appearances in media== {{Main|Aircraft in fiction#Hughes H-4 Hercules (Spruce Goose)}}

==See also== {{aircontent |related= |similar aircraft= * Blohm & Voss BV 238 (Large WW2 flying boat) * Blohm & Voss P 200 (Large WW2 flying boat design) * Latécoère 631 (Large airliner flying boat) * Martin JRM Mars (Largest Allied flying boat to enter service in WW2) * Saunders-Roe Princess (Post-war large airliner flying boat) |lists= * List of large aircraft |see also= * Charles M. Olmsted * Ground effect vehicle * Koolhoven – concept 100 ton (224,000 lb) flying boat<ref>{{cite web|last1=Den Ouden|first1=Alex|title=The aircraft designer Frederik (Frits) Koolhoven A gifted and prolific designer|url=http://www.alexdenouden.nl/artikelen/koolhoven.htm|website=Historical engineering and technology, industrial archaeology and history|publisher=Alex den Ouden Eindhoven – Nederland |access-date=7 September 2015}}</ref> }}

==References==

===Notes=== {{Reflist|group=N}}

===Citations=== {{Reflist}}

===Bibliography=== * Francillon, René J. ''McDonnell Douglas Aircraft since 1920: Volume II''. Annapolis, Maryland: Naval Institute Press, 1990. {{ISBN|1-55750-550-0}}. * McDonald, John J. ''Howard Hughes and the Spruce Goose''. Blue Ridge Summit, Pennsylvania: Tab Books Inc., 1981. {{ISBN|0-8306-2320-5}}. * Odekirk, Glenn E. ''Spruce Goose'' (Title inside cover: ''HK-1 Hercules: A Pictorial History of the Fantastic Hughes Flying Boat''). Long Beach, California: Glenn E. Odekirk and Frank Alcantr, Inc., 1982. No ISBN. * Parker, Dana T. ''Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II,'' Cypress, CA, 2013. {{ISBN|978-0-9897906-0-4}}. * Winchester, Jim. "Hughes H-4 'Spruce Goose'." ''Concept Aircraft: Prototypes, X-Planes and Experimental Aircraft''. Kent, UK: Grange Books plc., 2005. {{ISBN|978-1-59223-480-6}}.

===Further reading=== {{Refbegin}} * David, Peter. ''The Rocketeer: The Official Movie Adaptation''. Burbank, California: W D Publications Inc., 1991. {{ISBN|1-56115-190-4}}. * Schwartz, Milton L.''The Spruce Goose Commemorative Pictorial''. Oakland, California: The Wrather Corporation by Mike Roberts Color Productions, 1983. * Yenne, Bill. ''Seaplanes & Flying Boats: A Timeless Collection from Aviation's Golden Age''. New York: BCL Press, 2003. {{ISBN|1-932302-03-4}}. * [http://www.popsci.com/archive-viewer?id=MSEDAAAAMBAJ&pg=94&query=June+1945 "Look Inside The World's Largest Plane"] {{Webarchive|url=https://web.archive.org/web/20130602163259/http://www.popsci.com/archive-viewer?id=MSEDAAAAMBAJ&pg=94&query=June+1945 |date=June 2, 2013 }} – ''Popular Science'', September 1945 * [https://books.google.com/books?id=LiEDAAAAMBAJ&pg=RA2-PA28 "World's Largest Airplane Takes To The Road"] – ''Popular Science'', August 1946 * [https://books.google.com/books?id=QtkDAAAAMBAJ&pg=PA124 "200 tons and it flies!"] – Popular Mechanics, January 1948 {{Refend}}

==External links== {{Commons}} {{Commons category|Hughes H-4 Hercules}} * [http://www.evergreenmuseum.org/the-museum/aircraft-exhibits/the-spruce-goose/ Evergreen Aviation & Space Museum, home of the ''Spruce Goose''] {{Webarchive|url=https://web.archive.org/web/20150927201715/http://evergreenmuseum.org/the-museum/aircraft-exhibits/the-spruce-goose/ |date=September 27, 2015 }} * Paul Stewart, [https://www.youtube.com/watch?v=zwniLHX-KTc "Detailed tour through the Spruce Goose! - the Hughes H-4 Hercules,"] via YouTube.com, May 6, 2022. (Video.) * [http://mashable.com/2015/08/21/howard-hughes-plane/#qYvHIkZtGkkR Vintage photos of ''Spruce Goose''{{'}}s construction]

Category:Aircraft on the National Register of Historic Places Category:Flying boats H-4 H-4 Category:1940s United States military transport aircraft Category:Eight-engined tractor aircraft Category:High-wing aircraft H-4 Category:Aircraft first flown in 1947 Category:Aircraft flown once Category:National Register of Historic Places in Yamhill County, Oregon Category:Eight-engined piston aircraft

Hughes H-4 Hercules

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