View source for Boeing Y1B-20

{{short description|American bomber project}}
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{{Infobox aircraft
 |name=Boeing Y1B-20
 |image=
 |caption=<!--image caption; if it isn't descriptive it should be left blank-->
 |type=[[Heavy bomber]]
 |manufacturer=[[Boeing]]
 |designer=
 |first_flight=n/a
 |introduction=
 |retired=
 |status=Cancelled
 |primary_user=[[United States Army Air Forces]]
 |more_users=<!--up to three more. please separate with <br/>.-->
 |produced=<!--years in production, e.g. 1970-1999, if still in active use but no longer built-->
 |number_built=0
 |unit cost=
 |developed_from=[[Boeing XB-15]]
 |variants=
}}
The '''Boeing Y1B-20''' ('''Boeing 316''') was designed as an improvement on the [[Boeing XB-15]].{{efn|''Y1-'' indicates a funding source outside normal fiscal year procurement.}} It was slightly larger than its predecessor, and was intended to use much more powerful engines. It was presented to the Army in early [[1938 in aviation|1938]], and two orders were placed soon after. The order was reversed before construction began.

Despite their cancellation, the XB-15 and Y1B-20 laid the groundwork for the [[Boeing B-29 Superfortress]].<ref name=Kohn>{{cite book|last=Kohn|first=Leo|chapter=Boeing XB-15 Super Flying Fortress: U.S. Heavy Bomber|editor=Ray Merriam|title=U. S. Warplanes of World War II|publisher=Merriam Press|pages=43–44|isbn=1-57638-167-6|volume=69|series=World War II Journal|date=July 2000 }}</ref>

==Specifications (as designed)==
{{Aircraft specs
|prime units?=imp
|ref=
|crew=10
|length ft=109
|length in=2
|length m=33.3 
|span ft=157
|span in=0
|span m=47.8 
|height ft=23
|height in=4
|height m=7.1 
|empty weight lb=87500 
|empty weight kg=39700 
|gross weight lb=91500 
|gross weight kg=41500 
|max takeoff weight lb=105100 
|max takeoff weight kg=47700

|eng1 number=4
|eng1 type=geared [[radial engine|radials]]
|eng1 name=[[Wright R-2600|Wright GR-2600]]-A73
|eng1 hp=1,350 
|eng1 kw=1,000

|max speed mph=258 
|max speed kts=224
|max speed kmh=415
|cruise speed mph=242 
|cruise speed kts=210
|cruise speed kmh=389
|range miles=4000 
|range nmi=3500
|range km=6400
|ceiling main=<!-- ft-->
|ceiling alt=<!-- m-->
|climb rate main=<!-- ft/min-->
|climb rate alt=<!-- m/s-->
|wing loading main=<!-- lb/ft<sup>2</sup>-->
|wing loading alt=<!-- kg/m<sup>2</sup>-->
|power/mass=0.059 hp/lb (97 W/kg)

|guns=<br/>
** 3× .30 in (7.62 mm) [[machine gun]]s
** 4× .50 in (12.7 mm) machine guns
|bombs=17,600 lb (6,620 kg)

}}

==See also==
{{aircontent
|related=
* [[Boeing XB-15]]
|similar aircraft=
* [[Douglas XB-19]]
* [[Martin XB-16]]
* [[B-29 Superfortress]]
|lists=
* [[List of bomber aircraft]]
* [[List of military aircraft of the United States]]
|see also=
}}

==References==
{{notelist}}{{Reflist}}

==External links==
*[https://web.archive.org/web/20051227032635/http://home.att.net/~jbaugher2/b20.html Encyclopedia of American Aircraft]
*[https://web.archive.org/web/20090806072409/http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2502 USAF Museum description of Y1B-20]

{{Boeing military aircraft}}
{{Boeing model numbers}}
{{USAF bomber aircraft}}

[[Category:Boeing aircraft|B-20, Boeing]]
[[Category:Four-engined tractor aircraft]]
[[Category:Cancelled military aircraft projects of the United States]]
[[Category:Mid-wing aircraft]]
[[Category:Four-engined piston aircraft]]
[[Category:Aircraft with retractable tricycle landing gear]]