View source for Martin XB-16

{{short description|American bomber project}}
{{Refimprove|date=April 2017}}

<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{{Infobox aircraft
 |name = XB-16
 |image = <!-- in the ''File:filename'' format with no image tags.  In-flight images are preferred for aircraft. -->
 |caption = <!-- Image caption; if it isn't descriptive, please skip. -->
 |alt = <!-- Alt text for main image -->
 |type = [[Bomber]]
 |national_origin = [[United States]]
 |manufacturer = [[Glenn L. Martin Company]]
 |design_group = <!--Only design group(s) different from the manufacturer -->
 |first_flight = <!--If this hasn't happened, skip this field! -->
 |status = Project only – canceled
 |program cost = <!--Total program cost-->
 |unit cost = <!--Incremental or flyaway cost for military or retail price for commercial aircraft-->
 |developed_from = <!--The aircraft which formed the basis for this aircraft-->
 |variants = <!--Variants OF this aircraft-->
 |developed_into = <!--For derivative aircraft based on this aircraft-->
}}

The '''Martin XB-16''', company designation '''Model 145''', was a projected heavy bomber designed in the [[United States]] during the 1930s.

==Design and development==
The XB-16 was designed to meet the [[United States Army Air Corps]] (USAAC) request for a bomber that could carry {{convert|2,500|lb|kg|abbr=on}} of bombs {{convert|5000|mi|km nmi|abbr=on}}.

The XB-16 (Model 145A) was to use four [[Allison V-1710]] liquid-cooled reciprocating [[V-engine]]s; contemporary American aircraft used air-cooled [[radial engine]]s.

In [[1935 in aviation|1935]], Martin revised the XB-16 design as the Model 145B. The wingspan was increased from {{convert|140|ft|m|abbr=on}} to {{convert|173|ft|m|abbr=on}}, and a set of V-1710 engines added to the trailing edge. This version had a wingspan 20% greater than that of the [[B-29 Superfortress]], the first operational bomber that would fill the role intended for the XB-16.

The XB-16 was canceled for essentially the same reason that the [[Boeing XB-15]] project was, as it was not fast enough to meet the requirements set by the Army. Since both were canceled around the same time, Martin did not have time to produce an XB-16.

==Specifications (Model 145A)==
{{Aircraft specs
|ref=U.S. bombers, 1928 to 1980s<ref name=Jones>{{cite book|last1=Jones|first1=Lloyd S.|title=U.S. bombers, 1928 to 1980s|date=1984|publisher=Aero Publishers|location=Fallbrook, CA|isbn=978-0-81689130-6|edition=4th|url-access=registration|url=https://archive.org/details/usbombers1928to100jone}}</ref>
|prime units?=imp
<!--
        General characteristics
-->
|crew=ten
|capacity=
|length m= 35
|length ft=
|length in=
|length note=
|span m=
|span ft=140
|span in=
|span note=<br />
*:'''Model 145B''': {{convert|173|ft|m|abbr=on}}
|height m=
|height ft=
|height in=
|height note=
|wing area sqm=
|wing area sqft=
|wing area note=
{{convert |50,660|lb|kg|abbr=on}}
|gross weight kg=
|gross weight lb=65000
|gross weight note=<br />
*:'''Model 145B''': {{convert|104880|lb|kg|abbr=on}}
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity={{convert|4238|USgal|l impgal|abbr=on}}
|more general=
<!--
        Powerplant
-->
|eng1 number=4
|eng1 name=[[Allison V-1710-3]]
|eng1 type=V-12 liquid-cooled piston engines
|eng1 kw=<!-- prop engines -->
|eng1 hp=1000
|eng1 shp=<!-- prop engines -->
|eng1 note=(Model 145B ×6)
|power original=
|thrust original=
|eng1 kn-ab=<!-- afterburners -->
|eng1 lbf-ab=<!-- afterburners -->

|prop blade number=<!-- propeller aircraft -->
|prop name=
|prop dia m=<!-- propeller aircraft -->
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop dia note=
<!--
        Performance
-->
|max speed kmh=
|max speed mph=237
|max speed kts=
|max speed note=at {{convert|20000|ft|m|abbr=on}}
|cruise speed kmh=
|cruise speed mph=140
|cruise speed kts=
|cruise speed note=
|stall speed kmh=
|stall speed mph=
|stall speed kts=
|stall speed note=
|never exceed speed kmh=
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|minimum control speed kmh=
|minimum control speed mph=
|minimum control speed kts=
|minimum control speed note=
|range km=
|range miles=5000
|range nmi=
|range note=
|combat range km=
|combat range miles=3200
|combat range nmi=
|combat range note=with {{convert|12180|lb|kg|abbr=on}} of bombs
|ferry range km=
|ferry range miles=
|ferry range nmi=
|ferry range note=
|endurance=18 hours
|ceiling m=
|ceiling ft=22500
|ceiling note=
|g limits=<!-- aerobatic -->
|roll rate=<!-- aerobatic -->
|glide ratio=<!-- sailplanes -->
|climb rate ms=
|climb rate ftmin=740
|climb rate note=
|time to altitude=
|sink rate ms=<!-- sailplanes -->
|sink rate ftmin=<!-- sailplanes -->
|sink rate note=
|lift to drag=
|wing loading kg/m2=
|wing loading lb/sqft=
|wing loading note=
|disk loading kg/m2=
|disk loading lb/sqft=
|disk loading note=
|fuel consumption kg/km=
|fuel consumption lb/mi=
|power/mass=0.049 hp/lb (0.080 kW/kg)
|thrust/weight=

|more performance=
<!--
        Armament
-->
|guns= 
|bombs= {{convert|12180|lb|kg|abbr=on}} of bombs
}}

==See also==
{{aircontent
|similar aircraft=
* [[Boeing XB-15]]
* [[Boeing Y1B-20]]
* [[Douglas XB-19]]
|lists=
* [[List of bomber aircraft]]
* [[List of military aircraft of the United States]]
}}

==References==
{{Reflist}}

==External links==

* [https://web.archive.org/web/20070825224517/http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2487 USAF Museum description of XB-16]
* [https://web.archive.org/web/20120225110916/http://www.marylandaviationmuseum.org/pdf/146_spec.pdf Martin aircraft 146 specifications]

{{Martin aircraft}}
{{USAF bomber aircraft}}

[[Category:1930s United States bomber aircraft|Martin B-16]]
[[Category:Martin aircraft|B-16]]
[[Category:Four-engined tractor aircraft]]
[[Category:Four-engined piston aircraft]]
[[Category:Twin-tail aircraft]]
[[Category:Low-wing aircraft]]
[[Category:Aircraft with retractable conventional landing gear]]
[[Category:Cancelled military aircraft projects of the United States]]