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The Douglas B-18 Bolo is an American twin-engined
medium bomber A medium bomber is a military bomber Fixed-wing aircraft, aircraft designed to operate with medium-sized Aerial bomb, bombloads over medium Range (aeronautics), range distances; the name serves to distinguish this type from larger heavy bombe ...
which served with the
United States Army Air Corps The United States Army Air Corps (USAAC) was the aerial warfare service component of the United States Army between 1926 and 1941. After World War I, as early aviation became an increasingly important part of modern warfare, a philosophical ri ...
and the
Royal Canadian Air Force The Royal Canadian Air Force (RCAF; ) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environmental commands within the unified Can ...
(as the Digby) during the late 1930s and early 1940s. The Bolo was developed by the
Douglas Aircraft Company The Douglas Aircraft Company was an American aerospace manufacturer, aerospace and military, defense company based in Southern California. Founded in 1921 by Donald Wills Douglas Sr., it merged with McDonnell Aircraft in 1967 to form McDonnell D ...
from their
DC-2 The Douglas DC-2 is a retired 14-passenger, Aircraft engine, twin-engined airliner that was produced by the American company Douglas Aircraft Company starting in 1934. It competed with the Boeing 247. In 1935, Douglas produced a larger version ca ...
as a replacement for the
Martin B-10 The Martin B-10 is a bomber aircraft designed by the Glenn L. Martin Company. It was the first all-metal monoplane bomber to be regularly used by the United States Army Air Corps, having entered service in June 1934.Jackson 2003, p. 246. It wa ...
. By 1940 standards, it was slow, had an inadequate defensive armament, and carried too small a bomb load. By 1942, surviving B-18s were relegated to antisubmarine, training and transport duties. A B-18 was one of the first USAAF aircraft to sink a German
U-boat U-boats are Submarine#Military, naval submarines operated by Germany, including during the World War I, First and Second World Wars. The term is an Anglicization#Loanwords, anglicized form of the German word , a shortening of (), though the G ...
, on 22 August 1942 in the Caribbean.


Design and development

In 1934, the
United States Army Air Corps The United States Army Air Corps (USAAC) was the aerial warfare service component of the United States Army between 1926 and 1941. After World War I, as early aviation became an increasingly important part of modern warfare, a philosophical ri ...
requested for a twin-engine
bomber A bomber is a military combat aircraft that utilizes air-to-ground weaponry to drop bombs, launch aerial torpedo, torpedoes, or deploy air-launched cruise missiles. There are two major classifications of bomber: strategic and tactical. Strateg ...
with double the bomb load and range of the
Martin B-10 The Martin B-10 is a bomber aircraft designed by the Glenn L. Martin Company. It was the first all-metal monoplane bomber to be regularly used by the United States Army Air Corps, having entered service in June 1934.Jackson 2003, p. 246. It wa ...
then entering service. During the evaluation at Wright Field the following year, Douglas offered its DB-1. It was competing against the Boeing Model 299 (later developed into the
Boeing B-17 Flying Fortress The Boeing B-17 Flying Fortress is an American four-engined heavy bomber aircraft developed in the 1930s for the United States Army Air Corps (USAAC). A fast and high-flying bomber, the B-17 dropped more bombs than any other aircraft during ...
) and Martin 146. While the Boeing design was clearly superior, the 299's four engines eliminated it from consideration despite being the favorite, and the crash of the prototype — caused by taking off with the controls still locked — put its purchase on hold. The Martin 146 was a minor improvement on the B-10, and was never seriously considered. During the depths of the
Great Depression The Great Depression was a severe global economic downturn from 1929 to 1939. The period was characterized by high rates of unemployment and poverty, drastic reductions in industrial production and international trade, and widespread bank and ...
, the lower price of the DB-1 at $58,500 compared to $99,620 for the Model 299 also favored the Douglas entry, and it was ordered into immediate production in January 1936 as the B-18. The DB-1 design was modified from that of the DC-2. The wingspan was greater, the fuselage was narrower and deeper, and the wings were moved up to a mid-wing position to allow space under the spars for an enclosed bomb bay. Added armament included manually operated nose, dorsal, and ventral
gun A gun is a device that Propulsion, propels a projectile using pressure or explosive force. The projectiles are typically solid, but can also be pressurized liquid (e.g. in water guns or water cannon, cannons), or gas (e.g. light-gas gun). So ...
turrets. At one point,
Preston Tucker Preston Thomas Tucker (21 September 1903 – 26 December 1956) was an American automobile entrepreneur who developed the innovative Tucker 48 sedan, initially nicknamed the "Tucker Torpedo", an automobile which introduced many features that ...
's firm received a contract to supply Tucker remote controlled gun turrets but these were unsuccessful, and were never used in service.Lehto, 2016, p. no. not available.


Operational history

The initial contract called for 133 B-18s (including the prototype), using
Wright R-1820 The Wright R-1820 Cyclone 9 is an American radial engine developed by Curtiss-Wright, widely used on aircraft in the 1930s through 1950s. It was produced under license in France as the Hispano-Suiza 9V or Hispano-Wright 9V, and in the Soviet Uni ...
radial engine The radial engine is a reciprocating engine, reciprocating type internal combustion engine, internal combustion engine configuration in which the cylinder (engine), cylinders "radiate" outward from a central crankcase like the spokes of a wheel. ...
s. The last B-18 of the run, designated DB-2 by the company, had a power-operated nose turret in a redesigned nose but this did not become standard. Additional contracts in 1937 (177 aircraft) and 1938 (40 aircraft) were for the B-18A, which had the bombardier's position further forward over the nose- gunner's station in a wedge shaped nose and the B-18A was fitted with more powerful engines. Deliveries of B-18s to Army units began in the first half of 1937, with the first examples being test and evaluation aircraft being turned over to the Materiel Division at Wright Field,
Ohio Ohio ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Lake Erie to the north, Pennsylvania to the east, West Virginia to the southeast, Kentucky to the southwest, Indiana to the ...
, the Technical Training Command at Chanute Field,
Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. It borders on Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash River, Wabash and Ohio River, Ohio rivers to its ...
, the
Aberdeen Proving Ground Aberdeen Proving Ground (APG) is a U.S. Army facility located adjacent to Aberdeen, Harford County, Maryland, United States. More than 7,500 civilians and 5,000 military personnel work at APG. There are 11 major commands among the tenant units, ...
,
Maryland Maryland ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic region of the United States. It borders the states of Virginia to its south, West Virginia to its west, Pennsylvania to its north, and Delaware to its east ...
, and Lowry Field, Colorado. Deliveries to operational groups began in late 1937, the first being the 7th Bombardment Group at Hamilton Field,
California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
. Production B-18s, with full military equipment, had a maximum speed of , cruising speed of , and combat range of . By 1940, most USAAC bomber squadrons were equipped with B-18s or B-18As. However, the B-18/B-18A's deficiencies were made apparent when an all-red Soviet Ilyushin TsKB-30 named ''Moskva'' (a prototype for the twin-engine DB-3 which flew the same year as the B-18) made a non-stop flight from
Moscow Moscow is the Capital city, capital and List of cities and towns in Russia by population, largest city of Russia, standing on the Moskva (river), Moskva River in Central Russia. It has a population estimated at over 13 million residents with ...
to North America in April 1939, a distance of , which was well beyond the capabilities of the B-18. The TsKB-30/DB-3 was also 25% faster, was capable of carrying a bomb load 2.5 times as large as the B-18, and carried a heavier defensive armament. In August of the same year, a Japanese Mitsubishi G3M2 named ''Nippon'' (which also had its first flight the same year as the B-18) flew from Tokyo to the US, and then around the world, with the stage from Chitose, Hokkaido to
Nome, Alaska Nome (; , , also ''Sitŋazuaq'', ''Siqnazuaq'') is a city in the Nome Census Area, Alaska, Nome Census Area in the Unorganized Borough, Alaska, Unorganized Borough of the US state of Alaska. The city is located on the southern Seward Peninsula c ...
being over . The military version (code named ''Nell'' during WW2) could also carry more than the B-18, further, faster, and was also better armed. Both types had roughly higher service ceilings as well. The Air Corps conceded that the Bolo was obsolete and unsuitable for its intended role. However, in spite of this, the B-18/B-18A was still the most numerous American bomber type deployed outside the continental United States at the time of the
attack on Pearl Harbor The attack on Pearl HarborAlso known as the Battle of Pearl Harbor was a surprise military strike by the Empire of Japan on the United States Pacific Fleet at Naval Station Pearl Harbor, its naval base at Pearl Harbor on Oahu, Territory of ...
. The B-18 would be a stopgap until the more capable
Boeing B-17 Flying Fortress The Boeing B-17 Flying Fortress is an American four-engined heavy bomber aircraft developed in the 1930s for the United States Army Air Corps (USAAC). A fast and high-flying bomber, the B-17 dropped more bombs than any other aircraft during ...
and
Consolidated B-24 Liberator The Consolidated B-24 Liberator is an American heavy bomber, designed by Consolidated Aircraft of San Diego, California. It was known within the company as the Model 32, and some initial production aircraft were laid down as export models desi ...
became available in quantity.


World War II

When war came to the Pacific, most of the B-18/B-18A aircraft based overseas in the Philippines and in Hawaii were destroyed on the ground in the initial Japanese onslaught. The few Bolos that remained played no significant role in subsequent operations. The B-18s remaining in the continental US and in the Caribbean were then deployed in a defensive role in anticipation of attacks on the US mainland. These attacks never materialized. B-17s supplanted B-18s in first-line service in 1942. Following this, 122 B-18As were modified for anti-
submarine A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.) The term "submarine" is also sometimes used historically or infor ...
warfare. The bombardier was replaced by a search
radar Radar is a system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track ...
with a large
radome A radome (a portmanteau of "radar" and "dome") is a structural, weatherproof enclosure that protects a radar antenna (radio), antenna. The radome is constructed of material transparent to radio waves. Radomes protect the antenna from weathe ...
. Magnetic anomaly detection (MAD) equipment was sometimes housed in a tail boom. These aircraft, designated B-18B, were used in the
Caribbean The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...
on anti-submarine patrol. On 2 October 1942, a B-18A, piloted by Captain Howard Burhanna Jr. of the 99th Bomb Squadron, depth charged and sank the north of
Cayenne Cayenne (; ; ) is the Prefectures in France, prefecture and capital city of French Guiana, an overseas region and Overseas department, department of France located in South America. The city stands on a former island at the mouth of the Caye ...
,
French Guiana French Guiana, or Guyane in French, is an Overseas departments and regions of France, overseas department and region of France located on the northern coast of South America in the Guianas and the West Indies. Bordered by Suriname to the west ...
. Two aircraft were transferred to the
Brazilian Air Force The Brazilian Air Force (, FAB) is the air branch of the Brazilian Armed Forces and one of the three national uniformed services. The FAB was formed when the Brazilian Brazilian Army Aviation (1919–1941), Army and Brazilian Naval Aviation, Nav ...
in 1942, and were used with a provisional conversion training unit set up under the provisions of Lend-Lease. They were later used for anti-submarine patrols. They were struck off at the end of the war. In 1940 the
Royal Canadian Air Force The Royal Canadian Air Force (RCAF; ) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environmental commands within the unified Can ...
acquired 20 B-18As (as the Douglas Digby Mark I), and also used them for patrol duties, being immediately issued to 10 Squadron to replace the squadron's
Westland Wapiti The Westland Wapiti was a British two-seat general-purpose military single-engined biplane of the 1920s. It was designed and built by Westland Aircraft Works to replace the Airco DH.9A in Royal Air Force service. First flying in 1927, the Wa ...
s. Bolos and Digbys sank an additional two submarines during the course of the war.
RCAF Eastern Air Command Eastern Air Command was the part of the Royal Canadian Air Force's Home War Establishment responsible for air operations on the Atlantic coast of Canada during the Second World War. It played a critical role in anti-submarine operations in Canadia ...
(EAC) Digbys carried out 11 attacks on U-boats. was confirmed sunk by Flying Officer F. Raymes' crew of No. 10 (BR) Squadron, on 30 October 1942. east of
Newfoundland Newfoundland and Labrador is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region of Labrador, having a total size of . As of 2025 the population ...
. However, the antisubmarine role was relatively short-lived, and the Bolos were superseded in this role in 1943 by B-24 Liberators, which had a much heavier payload and a substantially longer range, which finally closed the mid-Atlantic gap. Some of the Douglas Digbys in Canadian service were converted into transports or used for training. Surviving USAAF B-18s ended their useful lives in training and transport roles, and saw no further combat action. Two B-18As were modified as unarmed cargo transports under the designation C-58. At the end of the war, remaining examples were sold as surplus on the commercial market. Some postwar B-18s were operated as cargo or crop-spraying aircraft by commercial operators.


Variants

;DB-1 :Manufacturer's designation for prototype, first of B-18 production run, 1 built. ;B-18 :Initial production version, 131 or 133 built. ;;B-18M :Trainer B-18 with bomb gear removed. ; DB-2 : Manufacturer's designation for prototype with powered nose turret; last of B-18 production run, 1 built. ;B-18A :B-18 with more powerful
Wright R-1820 The Wright R-1820 Cyclone 9 is an American radial engine developed by Curtiss-Wright, widely used on aircraft in the 1930s through 1950s. It was produced under license in France as the Hispano-Suiza 9V or Hispano-Wright 9V, and in the Soviet Uni ...
-53 engines and relocated bombardier's station, 217 built. Manufacturer's designation was DB-4. ;B-18AM :Trainer B-18A with bomb gear removed. ;B-18B : Antisubmarine conversion, 122 converted by adding a radar and magnetic anomaly detector. ;B-18C :Antisubmarine conversion, 2 converted. Fixed forward-firing machine gun, starboard side of the fuselage near lower nose glazing. ;XB-22 :Improved B-18 with
Wright R-2600 The Wright R-2600 Cyclone 14 (also called Twin Cyclone) is an American radial engine developed by Curtiss-Wright, and widely used in aircraft in the 1930s and 1940s. History In 1935, Curtiss-Wright began work on a more powerful version of thei ...
-3 radial engines. Not built, due to better designs being available. ;C-58 :Transport conversion. ;Digby Mark I :
Royal Canadian Air Force The Royal Canadian Air Force (RCAF; ) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environmental commands within the unified Can ...
modification of B-18A. Named for
RAF Digby Royal Air Force Digby otherwise known as RAF Digby is a Royal Air Force List of Royal Air Force stations, station located near Scopwick and south east of Lincoln, Lincolnshire, Lincoln, in Lincolnshire, England. The station is home to the tri-s ...
.


Operators

; *
Brazilian Air Force The Brazilian Air Force (, FAB) is the air branch of the Brazilian Armed Forces and one of the three national uniformed services. The FAB was formed when the Brazilian Brazilian Army Aviation (1919–1941), Army and Brazilian Naval Aviation, Nav ...
: 1st Bomber Group (3 examples) ; *
Royal Canadian Air Force The Royal Canadian Air Force (RCAF; ) is the air and space force of Canada. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". The RCAF is one of three environmental commands within the unified Can ...
: No. 10 Squadron RCAF,
Halifax, Nova Scotia Halifax is the capital and most populous municipality of the Provinces and territories of Canada, Canadian province of Nova Scotia, and the most populous municipality in Atlantic Canada. As of 2024, it is estimated that the population of the H ...
(Digby Mk.1) ; *
United States Army Air Corps The United States Army Air Corps (USAAC) was the aerial warfare service component of the United States Army between 1926 and 1941. After World War I, as early aviation became an increasingly important part of modern warfare, a philosophical ri ...
/
United States Army Air Forces The United States Army Air Forces (USAAF or AAF) was the major land-based aerial warfare service component of the United States Army and ''de facto'' aerial warfare service branch of the United States during and immediately after World War II ...
: 1st Search Attack Group, Langley Field, Virginia (B-18A/B/C) : 2d Bombardment Group, Langley Field, Virginia (B-18A) : 3d Bombardment Group, Barksdale Field, Louisiana (B-18) : 5th Bombardment Group, Hickam Field, Hawaii (B-18)Most aircraft were destroyed on the 7th and 8th December 1941 during the Japanese attacks on the outbreak of war between Japan and the US. : 6th Bombardment Group, Rio Hato Airfield, Panama, (B-18/B-18A/B) : 7th Bombardment Group, Hamilton Field, California, (B-18) : 5th Bombardment Group, Luke Field, Oahu, Hawaii Territory (B-18) :
9th Bombardment Group 009 may refer to: * OO9, gauge model railways * O09, FAA identifier for Round Valley Airport * 0O9, FAA identifier for Ward Field, see List of airports in California * British secret agent 009, see 00 Agent * BA 009, see British Airways Flight 9 ...
, Caribbean; Panama and South American air bases (B-18/B-18A/B) :
11th Bombardment Group International direct dialing (IDD) or international subscriber dialling (ISD) is placing an international telephone call, dialed directly by a telephone subscriber, rather than by a telephone operator. Subscriber dialing of international calls t ...
, Hickam Field, Hawaii Territory (B-18) : 13th Bombardment Group, Langley Field, Virginia (B-18A/B) : 17th Bombardment Group,
McChord Field McChord Field (formerly and still commonly known as McChord Air Force Base) is a United States Air Force base in the northwest United States, in Pierce County, Washington. South of Tacoma, McChord AFB is the home of the 62nd Airlift Wing, ...
, Washington (B-18) : 19th Bombardment Group, Clark Field, Philippines Commonwealth (B-18) : 22d Bombardment Group, Muroc Field, California (B-18) : 25th Bombardment Group, Caribbean (B-18/B) : 27th Bombardment Group, Barksdale Field, Louisiana (B-18) : 28th Bombardment Group, California, (B-18) : 28th Composite Group, Elmendorf Field, Alaska, (B-18A) : 29th Bombardment Group, Langley Field (B-18A) :
40th Bombardment Group 4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. Evolution of the H ...
, Panama, Puerto Rico (B-18/B) : 41st Bombardment Group, California, (B-18) : 42nd Bombardment Group, Portland, Oregon (B-18) : 45th Bombardment Group, Savannah Airfield, Georgia (B-18A) :
47th Bombardment Group 47th may refer to: Chicago Transit Authority stations * 47th station (CTA Green Line) 47th is a station on the Chicago Transit Authority's "L" system, located in the Grand Boulevard community area of Chicago, Illinois and serving the Gree ...
, McChord Field, Washington (B-18) : 479th Antisubmarine Group, Langley Field, Virginia (B-18A/B)


Aircraft on display

Six B-18s are known to exist, five of them preserved or under restoration in museums in the United States, and one is a wreck still located at its crash site: ;B-18 * 36-446 – Kohala Mountains, Hawaii. Tail code "81 50R". Crashed in 1941 and abandoned. The Air Force recovered the nose turret for 37-029 and the dorsal turret for 37-469. The Pacific Air Museum in Honolulu has had plans to recover the airframe. * 37-029 – Castle Air Museum at the former Castle Air Force Base in
Atwater, California Atwater is a city on State Route 99 in Merced County, California, United States. Atwater is west-northwest of Merced, at an elevation of . The population as of the 2020 census was 31,970, up from 28,168 in 2010. Geography Atwater is in north ...
. Dropped from USAAF inventory in 1944, it was registered as NC52056 in 1945, later to N52056. The B-18 was used by Avery Aviation and then Hawkins and Powers, as a firebomber, dropping borate for many years. ;B-18A * 37-469 –
National Museum of the United States Air Force The National Museum of the United States Air Force (formerly the United States Air Force Museum) is the official museum of the United States Air Force located at Wright-Patterson Air Force Base, northeast of Dayton, Ohio. The NMUSAF is ...
at
Wright-Patterson Air Force Base Wright-Patterson Air Force Base (WPAFB) is a United States Air Force base and census-designated place just east of Dayton, Ohio, in Greene County, Ohio, Greene and Montgomery County, Ohio, Montgomery counties. It includes both Wright and Patte ...
in
Dayton, Ohio Dayton () is a city in Montgomery County, Ohio, United States, and its county seat. It is the List of cities in Ohio, sixth-most populous city in Ohio, with a population of 137,644 at the 2020 United States census, 2020 census. The Dayton metro ...
. One of the first production Bolos, was delivered to Wright Field in 1937 for evaluation testing. Sold as N56847, converted to crop sprayer; by May 1969 stored derelict at Tucson, Arizona. It sat outdoors for many years, before being restored to static display condition. This aircraft has an incorrect dorsal turret. The museum has been attempting to locate a correct turret for this aircraft for many years. * 39-025 – Wings Over the Rockies Air and Space Museum at the former
Lowry Air Force Base Lowry Air Force Base (Lowry Field from 1938–1948) is a former United States Army Air Forces (USAAF) training base during World War II and a United States Air Force (USAF) training base during the Cold War. From 1955-1958, it served as the i ...
in
Denver, Colorado Denver ( ) is a List of municipalities in Colorado#Consolidated city and county, consolidated city and county, the List of capitals in the United States, capital and List of municipalities in Colorado, most populous city of the U.S. state of ...
. This Bolo spent World War II at several airfields as a bombardier trainer and as a light transport. It was dropped from inventory on 3 November 1944, and was later sold, acquiring the civil registry NC62477. It spent 14 years on the civil registry before going to Cuba in 1958. In November 1958 the aircraft was seized in Florida by US Treasury agents when it was hauling guns to
Fidel Castro Fidel Alejandro Castro Ruz (13 August 1926 – 25 November 2016) was a Cuban politician and revolutionary who was the leader of Cuba from 1959 to 2008, serving as the prime minister of Cuba from 1959 to 1976 and President of Cuba, president ...
. In 1960, the aircraft was parked at Cannon AFB, New Mexico, until being presented to the
National Museum of the United States Air Force The National Museum of the United States Air Force (formerly the United States Air Force Museum) is the official museum of the United States Air Force located at Wright-Patterson Air Force Base, northeast of Dayton, Ohio. The NMUSAF is ...
at Wright-Patterson AFB. It flew to the museum in April 1961. In 1988, the aircraft was transferred to the Wings Over The Rockies Aviation and Space Museum where it was restored through the 1990s. It is displayed there as AAC Ser. No. 39-522. ;B-18A/B * 37-505 – On display at McChord Air Museum, Washington. Built as a B-18, converted during WWII to B-18B. Later sold as N67947 for agricultural chemical spraying, then Mexican registration XB-LAJ transporting fish. Donated to Tucson Air Museum Foundation, Pima County, Arizona, this was the last flyable B-18, making its final flight to Tucson on 10 April 1971. Subsequently acquired by the
National Museum of the United States Air Force The National Museum of the United States Air Force (formerly the United States Air Force Museum) is the official museum of the United States Air Force located at Wright-Patterson Air Force Base, northeast of Dayton, Ohio. The NMUSAF is ...
and stored at Davis-Monthan AFB until moved by C-5A to McChord Air Museum in 1983 for restoration. Rebuilt as model B-18A and displayed from 2007. ;B-18B * 38-593 –
Pima Air & Space Museum The Pima Air & Space Museum is an aerospace museum in Tucson, Arizona, US. It features a display of nearly 400 aircraft spread out over on a campus occupying . It has also been the home to the Arizona Aviation Hall of Fame since 1991. Overv ...
adjacent to Davis-Monthan Air Force Base in
Tucson, Arizona Tucson (; ; ) is a city in Pima County, Arizona, United States, and its county seat. It is the second-most populous city in Arizona, behind Phoenix, Arizona, Phoenix, with a population of 542,630 in the 2020 United States census. The Tucson ...
. This Bolo spent the early part of WWII on anti-submarine patrol. In 1943 began use a light transport. She was retired and struck from the inventory in 1945. Was operated as a firebomber as N66267, 1954–1970. In storage at Phoenix Goodyear Airport, Litchfield Park, Arizona by September 1969, then delivered to Pima on 5 September 1976. The aircraft sat outside in the desert for many years, before being restored and moved indoors for display. The aircraft is still equipped with an antisubmarine search radar dome."B-18 Bolo, s/n 38-593."
''Pima Air & Space Museum.'' Retrieved: 9 April 2012.


Specifications (B-18A)


Notable appearances in media


See also


References


Notes


Citations


Bibliography

* * * * * * {{Authority control 1930s United States bomber aircraft Douglas aircraft, B-18 Bolo 1930s United States military trainer aircraft 1930s United States military transport aircraft Aircraft first flown in 1935 Mid-wing aircraft Twin piston-engined tractor aircraft