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Boeing Y1B-20

United States (1938)
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Origin: United States
Year: 1938
Type: Experimental Heavy Bomber Aircraft
Manufacturer(s): Boeing Company - USA
Production: 0
Status: Retired, Out-of-Service


Though a production order was signed for two prototypes, the US Army was quick to cancel the large experimental Boeing Y1B-20.


Detailing the development and operational history of the Boeing Y1B-20 Experimental Heavy Bomber Aircraft.  Entry last updated on 10/24/2017. Authored by Staff Writer. Content ©www.MilitaryFactory.com

Leading up to its famous stable of World War 2 heavy bombers, Boeing undertook a variety of projects to further existing technologies and enhance qualities for long endurance flight of heavy airframes. One such program became the Y1B-20 (Boeing Model 316), an offshoot of the experimental XB-15. The original XB-15 was born of a 1933 United States Army Air Corps (USAAC) initiative seeking a bomber capable of 5,000 mile endurance reaching speeds of 200 miles per hour with a 2,000lb bomb load. The Y1B-20 was essentially an evolved, dimensionally larger version designed around use of more powerful engines - 4 x Wright GR-2600-A73 rated at 1,350 horsepower being the intended type. While presented to the Army (and accepted through two prototype orders), the product was cancelled before manufacture of either airframe had begun. As such, no examples were ever completed by Boeing and the project was lost to aviation history.

The four-engine arrangement and general aerodynamic design of the Y1B-20 was estimated to allow for a maximum speed of 258 miles per hour with a cruising speed of 242 miles per hour. Operational range was listed at 4,000 miles. Comparatively, the YB-15 - which saw considerably more interest and usage by the US Army - exhibited a maximum speed of 200 miles per hour and cruising at 150 miles per hour. Range was 5,130 miles while its service ceiling was 18,900 feet. The famous B-17 (G-model) allowed for a maximum speed of 290 miles per hour, cruising at 180 miles per hour, a range of 2,000 miles and a service ceiling of 35,600 feet.
As a heavy bomber, the Y1B-20 was slated to carry ordnance loads up to 17,600lbs internally. As with other bombers of the period, the aircraft was to be defensed through a network of purposefully placed machine guns numbering seven - 3 x 0.30 caliber and 4 x 0.50 caliber in nature.

At any rate, like the XB-15 before it, the Y1B-20 helped Boeing to lay the foundation for its stable of important bombers serving during World War 2 and beyond.






Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.

Image of collection of graph types

Relative Maximum Speed Rating
Hi: 300mph
Lo: 150mph
    This entry's maximum listed speed (258mph).

    Graph average of 225 miles-per-hour.
City-to-City Ranges
NYC
 
  LON
LON
 
  PAR
PAR
 
  BER
BER
 
  MOS
MOS
 
  TOK
TOK
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Graph showcases the Boeing Y1B-20's operational range (on internal fuel) when compared to distances between major cities.
Aviation Era
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Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production Comparison
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units
0
0


  * Commercial Market High belongs to Cessna 172.

  ** Military Market High belongs to Ilyushin Il-2.


  Compare this entry against other aircraft using our Comparison Tool  
Global Operators:
United States
Historical Commitments / Honors:

Military lapel ribbon for Operation Allied Force
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of Britain
Military lapel ribbon for the Battle of Midway
Military lapel ribbon for the Berlin Airlift
Military lapel ribbon for the Chaco War
Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for the Falklands War
Military lapel ribbon for the French-Indochina War
Military lapel ribbon for the Golden Age of Flight
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Iran-Iraq War
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1982 Lebanon War
Military lapel ribbon for the Malayan Emergency
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Six Day War
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Suez Crisis
Military lapel ribbon for the Vietnam War
Military lapel ribbon for Warsaw Pact of the Cold War-era
Military lapel ribbon for the WASP (WW2)
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur
* Ribbons not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns/operations.
Measurements and Weights icon
Structural - Crew, Dimensions, and Weights:
Unless otherwise noted the presented statistics below pertain to the Boeing Y1B-20 model. Common measurements, and their respective conversions, are shown when possible.

Operational
CREW


Personnel
10


Dimension
LENGTH


Feet
109.25 ft


Meters
33.3 m


Dimension
WIDTH


Feet
156.82 ft


Meters
47.8 m


Dimension
HEIGHT


Feet
23.29 ft


Meters
7.1 m


Weight
EMPTY


Pounds
87,524 lb


Kilograms
39,700 kg


Weight
LOADED


Pounds
105,160 lb


Kilograms
47,700 kg

Engine icon
Installed Power - Standard Day Performance:
4 x Wright GR-2600-A73 radial piston engines developing 1,350 horsepower each.

Performance
SPEED


Miles-per-Hour
258 mph


Kilometers-per-Hour
415 kph


Knots
224 kts


Performance
RANGE


Miles
3,977 mi


Kilometers
6,400 km


Nautical Miles
3,456 nm

Supported Weapon Systems:

Graphical image of an aircraft medium machine gun
Graphical image of an aircraft heavy machine gun
Armament - Hardpoints (0):

STANDARD:
3 x 0.50 caliber Browning M2 heavy machine guns
3 x 0.30 caliber Browning M1919 machine guns

OPTIONAL:
Up to 17,600lbs of internal stores.
Variants: Series Model Variants
• Y1B-20 - Base Series Designation
• Model 316 - Boeing Company Model Designation