- B-18 Bolo
name= B-18 Bolo
caption=Douglas B-18A airplane in flight.
Douglas Aircraft Company
first flight= April 1935
United States Army Air Corps
United States Army Air Forces Royal Canadian Air Force Brazilian Air Force
unit cost=US$58,500 (1935)
variants with their own articles=
Douglas XB-22C-58 BoloThe Douglas B-18 Bolo was a United States Army Air Corpsand Royal Canadian Air Force bomberof the late 1930s and early 1940s. The Bolo was built by Douglas Aircraft Companyand based on its DC-2. Although not the latest or most advanced design, the B-18 was pressed into service where it performed wartime patrol duties early in World War II.
Design and development
In 1934, the
United States Army Air Corpsput out a request for a bomberwith double the bomb load and range of the Martin B-10, which was just entering service as the Army's standard bomber.In the evaluation at Wright Fieldthe following year, Douglas showed its DB-1. It competed with the Boeing"Model 299" (later the B-17 Flying Fortress) and Martin Model 146. While the Boeing design was clearly superior, the crash of the B-17 prototype (caused by taking off with the controls locked) removed it from consideration. During the depths of the Great Depression, the lower price of the DB-1 ($58,500 vs. $99,620 for the Model 299) also counted in its favor. The Douglas design was ordered into immediate production in January 1936 as the B-18.
The DB-1 design was essentially the same as the
DC-2, with several modifications. The wingspan was 4.5 ft (1.4 m) greater. The fuselage was deeper, to better accommodate bombs and the six-member crew; the wings were fixed in the middle of the cross-section rather than to the bottom, but this was due to the deeper fuselage. Added armament included nose, dorsal, and ventral gunturrets.
The initial contract called for 133 B-18s (including DB-1), using
Wright R-1820 radial engines. The last B-18 of the run, designated DB-2 by the company, had a power-operated nose turret. This design 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. The B-18A also used more powerful engines.
By 1940, most
US Army Air Forcebomber squadrons were equipped with B-18s or B-18As. Many of those in the 5th Bomb Group and 11th Bomb Group in Hawaiiwere destroyed in the attack on Pearl Harbor.
B-17s supplanted B-18s in first-line service in 1942. Following this, 122 B-18As were modified for anti-
submarinewarfare. The bombardier was replaced by a search radarwith a large radome. Magnetic anomaly detection(MAD) equipment was sometimes housed in a tail boom. These aircraft, designated B-18B, were used in the Caribbeanon anti-submarine patrol. Two aircraft were transferred to Força Aérea Brasileira in 1942. The Royal Canadian Air Forceacquired 20 B-18As (designated the "Douglas Digby Mark I"), and also used them for patrol duties.
2 October 1942, a B-18A depth charged and sank the German u-boatU-512 north of Cayenne, French Guiana. [Uboat.net: [http://uboat.net/boats/u512.htm B-18 sinks U-512] ] Bolos and Digbys sank an additional two submarines during the course of the war. RCAF Eastern Air Command (EAC) Digbys carried out 11 attacks on U-boats. U-520 was confirmed sunk by Flying Officer F. Raymes' crew of No 10 (BR) Sqn, on 30 October 1942[ [http://www.rcaf.com/aircraft/patrol/digby/index.php Douglas Digby] ] east of Newfoundland. [Uboat.net: [http://uboat.net/boats/u520.htm Canadian Digby sinks U-520] ]
;DB-1:Prototype, first of B-18 production run, 1 built.;B-18:Initial production version, 131 or 133 built. [ [http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2457 "B-18" entry at the "National Museum of the USAF" website] ] ;;B-18M::Bomb gear removed from B-18 to serve as trainer.;;DB-2::Powered nose turret prototype; last of B-18 production run, 1 built.;B-18A:B-18 with more powerful
Wright R-1820-53 engines and moved bombardier's station, 217 built. [ [http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2458 "B-18A" entry at the "National Museum of the USAF" website] ] ;B-18AM:Bomb gear removed from B-18A to serve as trainer.;B-18B:Antisubmarine conversion, 122 converted. [ [http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2459 "B-18B" entry at the "National Museum of the USAF" website] ] ;B-18C:Antisubmarine conversion, 2 converted.;XB-22:Improvement on B-18 using Wright R-2600-3 radial engines (1,600 hp, 1194 kW). Never built, largely due to better light bombers such as the B-23 Dragon. [ [http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2492 "XB-22" entry at the "National Museum of the USAF" website] ] ;C-58:Transport conversion.;Digby I: Royal Canadian Air Forcemodification of B-18A.
Brazilian Air Force;flag|Canada|1921
Royal Canadian Air Force;flag|United States|1912
United States Army Air Corps
United States Army Air Force
Only five B-18s still exist, preserved in museums in the United States: [ [http://aeroweb.brooklyn.cuny.edu/locator/manufact/douglas/b-18.htm AeroWebs: "List of survivorr B-18s on display"] ] ;B-18 s/n "37-0029":On display at
Castle Air Museum, Atwater, California.;B-18A s/n "37-469":On display at National Museum of the United States Air Force, Wright-Patterson AFB, Ohio.;B-18A s/n "39-25/64":On display at Wings Over the Rockies Air and Space Museum, Denver, Colorado.:See the [http://members.aol.com/cba1974/myhomepage/B18walkaround.html Wings' B-18 Bolo Walk Around Site] with aircraft history.;B-18B s/n "37-505":On display at McChord Air Museum [http://www.mcchordairmuseum.org/] , McChord AFB, Washington.;B-18B s/n "38-593":On display at Pima Air & Space Museum Tucson, Arizona.;B-18 s/n "36-446":Sitting in a gulch on Laupahoehoe Nui LLC property, Hamakua, Hawai'i.:Hopefully soon to be rescued by the Pearl Harbor Aviation Museum.
plane or copter?=plane
jet or prop?=prop
length main=57 ft 10 in
length alt=17.6 m
span main=89 ft 6 in
span alt=27.3 m
height main=15 ft 2 in
height alt=4.6 m
area main=959 ft²
area alt=89.1 m²
empty weight main=16,321 lb
empty weight alt=7,400 kg
loaded weight main=22,123 lb
loaded weight alt=10,030 kg
max takeoff weight main=27,500 lb
max takeoff weight alt=12,600 kg
type of prop=
number of props=2
power main=1,000 hp
power alt=750 kW
max speed main=215 mph
max speed alt=197 knots, 346 km/h
combat range main=999 nm
combat range alt=1,150 mi, 1,850 km)
ferry range main=1,800 nm
ferry range alt=2,100 mi, 3,400 km
ceiling main=23,900 ft
ceiling alt=7,280 m
climb rate main=1,030 ft/min
climb rate alt=5.2 m/s
loading main=23.1 lb/ft²
loading alt=113 kg/m²
power/mass main=0.09 hp/lb
power/mass alt=150 W/kg
guns=3× .30 in (7.62 mm) machine guns
bombs=4,500 lb (2,200 kg)
List of bomber aircraft
List of military aircraft of the United States
* Francillon, René. "McDonnell Douglas Aircraft Since 1920: Volume I". London: Putnam, 1979. ISBN 0-87021-428-4.
* Kostenuk, Samuel and Griffin, John. "RCAF Squadron Histories and Aircraft: 1924–1968". Toronto: Samuel Stevens, Hakkert & Company, 1977. ISBN 0-88866-577-6.
* [http://home.att.net/~jbaugher2/b18.html Baughers: "B-18 Bolo" main page]
* [http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2457 USAF Museum Factsheet: "B-18 Bolo" with gallery]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Bolo — may be:* Bolo knife, a Filipino machete used for agricultural purposes and as a weapon. * Bolo punch, a wide sweeping uppercut used in boxing. * Bolo tie, decorative string with an ornament clasp worn around the neck, worn in the American West,… … Wikipedia
Bolo tie — A bolo tie (sometimes bola tie or shoestring necktie) is a type of necktie consisting of a piece of cord or braided leather with decorative metal tips or aglets (aiguillettes) secured with an ornamental clasp or slide. In the United States bolo… … Wikipedia
Bolo Yeung — Nombre real Yang Sze Nacimiento 3 de julio de 1946 (65 años) … Wikipedia Español
Bolo Yeung — (ou Yang Sze, né le 3 juillet 1946 à Canton, Chine) est un acteur de cinéma. Acteur ayant à son actif plus de 60 films, il joue très s … Wikipédia en Français
Bolo (Homonymie) — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Bolo, sorte de cravate souvent associée au cow boy ; Bolo, jeu, palette de bois ou plastique sur laquelle est fixé un élastique et une balle.… … Wikipédia en Français
Bolo Yeung — Yang Sze (chin: 杨斯/楊斯; Pinyin: Yáng Sī), besser bekannt als Bolo Yeung, (* 3. Juli 1946 in Guǎngzhōu) ist ein chinesischer Schauspieler und ehemaliger Bodybuilder. Hauptsächlich verkörpert er Bösewichte in Kampfkunst und … Deutsch Wikipedia
Bolo — Saltar a navegación, búsqueda Bolo puede referirse a: Bolo. Trozo de madera labrado con base plana para que se tenga derecho Bolo alimenticio. Masa formada por alimentos correspondiente a una degustación. Bolos. Juego Bolo, en argot musical, se… … Wikipedia Español
Bolo palma — Saltar a navegación, búsqueda Bolera de bolo palma vista desde el Tiro El Bolo Palma es una modalidad del juego de los bolos practicada en la mayor parte de Cantabria y en el oriente de Asturias. Es también conocido como jueg … Wikipedia Español
Bolo (Messer) — Angaben Waffenart: Messer … Deutsch Wikipedia
Bolo, Gonjo County — Bolo Town 莫洛镇 … Wikipedia
Bolo (Maske) — Angaben Waffenart: Schutzwaffe, zeremonieller Gegenstand … Deutsch Wikipedia