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Boeing Y1B-20


Experimental Heavy Bomber Aircraft


United States | 1938



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



Authored By: Staff Writer | Last Edited: 04/04/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
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.

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Power & Performance
Those special qualities that separate one aircraft design from another. Performance specifications presented assume optimal operating conditions for the Boeing Y1B-20 Experimental Heavy Bomber Aircraft.
4 x Wright GR-2600-A73 radial piston engines developing 1,350 horsepower each driving three-bladed propeller units.
Propulsion
258 mph
415 kph | 224 kts
Max Speed
3,977 miles
6,400 km | 3,456 nm
Operational Range
City-to-City Ranges
Operational range when compared to distances between major cities (in KM).
NYC
 
  LON
LON
 
  PAR
PAR
 
  BER
BER
 
  MOS
MOS
 
  TOK
TOK
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Structure
The nose-to-tail, wingtip-to-wingtip physical qualities of the Boeing Y1B-20 Experimental Heavy Bomber Aircraft.
10
(MANNED)
Crew
109.3 ft
33.30 m
O/A Length
156.8 ft
(47.80 m)
O/A Width
23.3 ft
(7.10 m)
O/A Height
87,524 lb
(39,700 kg)
Empty Weight
105,160 lb
(47,700 kg)
MTOW
Armament
Available supported armament and special-mission equipment featured in the design of the Boeing Y1B-20 Experimental Heavy Bomber Aircraft .
STANDARD:
3 x 0.50 caliber Browning M2 heavy machine guns.
3 x 0.30 caliber Browning M1919 machine guns.

OPTIONAL:
Up to 17,600lb of internal stores (conventional drop bombs).
Variants
Notable series variants as part of the Boeing Y1B-20 family line.
Y1B-20 - Base Series Designation
Model 316 - Boeing Company Model Designation
Operators
Global customers who have evaluated and/or operated the Boeing Y1B-20. Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 0 Units

Contractor(s): Boeing Company - USA
National flag of the United States

[ United States ]
Relative Max Speed
Hi: 300mph
Lo: 150mph
Aircraft Max Listed Speed (258mph).

Graph Average of 225 MPH.
Era Crossover
Pie graph section
Showcasing Aircraft Era Crossover (if any)
MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030
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Mission Roles
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GROUND ATTACK
X-PLANE
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
The Boeing Y1B-20 Experimental Heavy Bomber Aircraft appears in the following collections:
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