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{|{{Infobox aircraft begin
{{Infobox aircraft
|name=Model 146
|name=Model 146
|image= File:Martin Model 146.gif
|image= File:Martin Model 146.gif
|caption=Martin Model 146 during competition c. 1935, USAF photo
|caption=Martin Model 146 during competition c. 1935, USAF photo
}}{{Infobox aircraft type
|type=[[Heavy bomber]]
|type=[[Heavy bomber]]
|manufacturer=[[Glenn L. Martin Company]]
|manufacturer=[[Glenn L. Martin Company]]
|designer=
|designer=
|first flight=[[1932 in aviation|1935]]
|first_flight=[[1932 in aviation|1935]]
|introduced=
|introduction=
|retired=
|retired=
|status=Experimental prototype
|status=Experimental prototype
|primary user=[[United States Army Air Corps]] (intended)
|primary_user=[[United States Army Air Corps]] (intended)
|more users=
|more_users=
|produced=1935
|produced=1935
|number built=1
|number_built=1
|unit cost=
|unit cost=
|developed from= [[Martin B-10]]
|developed_from= [[Martin B-10]]
|variants with their own articles=
|variants=
}}
}}
|}


The '''Martin Model 146''' was an unsuccessful [[United States|American]] bomber design that lost a 1934–1935 bomber design competition to the prototype for the [[Douglas B-18 Bolo]] (itself soon supplanted by the [[Boeing B-17 Flying Fortress|B-17 Flying Fortress]]).
The '''Martin Model 146''' was an unsuccessful [[United States|American]] bomber design that lost a 1934–1935 bomber design competition to the prototype for the [[Douglas B-18 Bolo]] (which was itself soon thereafter supplanted by the [[Boeing B-17 Flying Fortress|B-17 Flying Fortress]]).


==Design and development==
==Design and development==
Although generally satisfied with the speed and bombload of the [[Martin B-10]], the [[United States Army Air Corps]] expressed a requirement for a bomber with long range. Two competitions were held in 1934-35: one for fast bombers capable of flying {{convert|2200|mi|km|-2}}, and a second for the experimental prototype of a {{convert|5000|mi|km|-2|adj=on}} bomber.
Although generally satisfied with the speed and bombload of the [[Martin B-10]], the [[United States Army Air Corps]] expressed a requirement for a bomber with long range. Two competitions were held in 1934–35: one for fast bombers capable of flying {{convert|2200|mi|km|-2}}, and a second for the experimental prototype of a {{convert|5000|mi|km|-2|adj=on}} bomber.


The Martin 146 was built for the first competition, competing with the Boeing Model 299 (later the B-17) and [[Douglas B-18 Bolo|Douglas DB-1]] (later the B-18). Two versions were submitted for the competition, the Model 146 (actual aircraft) and the Model 146A (design only). The only significance between the two was the planform, the 146 center section was rectangular with the outer wing being tapered while the 146A had a constant taper.
The Martin 146 was built for the first competition, competing with the Boeing Model 299 (later the B-17) and [[Douglas B-18 Bolo|Douglas DB-1]] (later the B-18). Two versions were submitted for the competition, the Model 146 (actual aircraft) and the Model 146A (design only). The only significant difference between the two was the planform, the 146 center section was rectangular with the outer wing being tapered while the 146A had a constant taper.


The Model 146 bore a striking resemblance to the earlier Martin B-10, with the same configurations of turret and cockpits and even the same two [[Wright R-1820 Cyclone]] engines – albeit with 50% more power than the 600&nbsp;hp Cyclones of the original B-10. The biggest differences between this aircraft and the Martin 139 (B-10) was that it was wider, allowing the pilot and co-pilot to sit side by side <ref>[http://www.marylandaviationmuseum.org/history/martin_aircraft/10_bombers.html "Model 146."] {{webarchive|url=https://web.archive.org/web/20070826132026/http://www.marylandaviationmuseum.org/history/martin_aircraft/10_bombers.html |date=2007-08-26 }} ''marylandaviationmuseum.org.'' Retrieved: 5 December 2o12.</ref> and was equipped with [[Fowler flap]]s, the first large aircraft equipped with them.
The Model 146 bore a striking resemblance to the earlier Martin B-10, with the same configurations of turret and cockpits and even the same two [[Wright R-1820 Cyclone]] engines – albeit with 33% more power than the {{Nowrap | 600 hp}} Cyclones of the original B-10. The biggest differences between this aircraft and the Martin 139 (B-10) was that it was wider, allowing the pilot and co-pilot to sit side by side <ref>[http://www.marylandaviationmuseum.org/history/martin_aircraft/10_bombers.html "Model 146."] {{webarchive|url=https://web.archive.org/web/20070826132026/http://www.marylandaviationmuseum.org/history/martin_aircraft/10_bombers.html |date=2007-08-26 }} ''marylandaviationmuseum.org.'' Retrieved: 5 December 2o12.</ref> and was equipped with [[Fowler flap]]s, the first large aircraft equipped with them.


The Model 146 was not successful but it led the Martin company to begin research into contemporary aviation technology. Some offshoots included the innovative [[Martin 145]] proposed for the long-range bomber competition as well as the early studies that would lead to the Model 179 (later to emerge as the wartime [[Martin B-26 Marauder|Martin B-26]]). The aircraft was eventually returned to the factory and scrapped.
The Model 146 was not successful but it led the Martin company to begin research into contemporary aviation technology. Some offshoots included the innovative [[Martin 145]] proposed for the long-range bomber competition as well as the early studies that would lead to the Model 179 (later to emerge as the wartime [[Martin B-26 Marauder|Martin B-26]]). The aircraft was eventually returned to the factory and scrapped.


==Specifications (Model 146)==
==Specifications (Model 146)==
{{aircraft specifications


{{Aircraft specs
|plane or copter?=plane
|ref=Martin 146 Specifications<ref name=maryland>[http://www.marylandaviationmuseum.org/pdf/146_spec.pdf Martin 146 Specifications.'] {{webarchive|url=https://web.archive.org/web/20120225110916/http://www.marylandaviationmuseum.org/pdf/146_spec.pdf |date=2012-02-25 }} ''marylandaviationmuseum.org.'' Retrieved: 5 December 2012.</ref>
|jet or prop?=prop
|prime units?=imp
|ref=
<!--
|crew=four
General characteristics
|length main=52 ft 0 in
-->
|length alt=15.5 m
|crew=4
|span main=75 ft 1 in
|length ft=52
|span alt=22.9 m
|length in=0
|height main=15 ft 5 in
|length note=
|height alt=4.7 m
|span ft=75
|area main=729 ft<sup>2</sup>
|span in=1
|area alt=67.7 m<sup>2</sup>
|span note=
|loaded weight main=16,000 lb
|height ft=15
|loaded weight alt=7,257 kg
|height in=5
|max takeoff weight main=17,100 lb
|height note=
|max takeoff weight alt=7,756 kg
|wing area sqft=729
|number of props=2
|wing area note=
|type of prop="Cyclone" [[radial engine|radials]]
|aspect ratio=<!-- sailplanes -->
|engine (prop)=[[Wright R-1820]]-G5 Cyclones
|airfoil=
|power main=800 hp
|empty weight lb=
|power alt=597 kW
|empty weight note=
|max speed main=234 mph
|gross weight lb=16000
|max speed alt=203 knots, 377 km/h
|gross weight note=
|cruise speed main=204 mph
|max takeoff weight lb=17100
|cruise speed alt=177 knots, 328 km/h
|max takeoff weight note=
|range main=1,237 mi
|fuel capacity=
|range alt=1,075 nmi, 1,991km
|more general=
|ceiling main=28,500 ft
<!--
|ceiling alt=8,687 m
Powerplant
|loading main=21.95 lb/ft<sup>2</sup>
-->
|loading alt=107.2 kg/m<sup>2</sup>
|eng1 number=2
|power/mass main=0.100 hp/lb
|eng1 name=[[Wright R-1820-G5 Cyclone]]
|power/mass alt=164.5 W/kg
|eng1 type=9-cylinder air-cooled radial piston engines
|eng1 hp=800
|eng1 note=

|prop blade number=3
|prop name=constant-speed propellers
|prop dia ft=<!-- propeller aircraft -->
|prop dia in=<!-- propeller aircraft -->
|prop dia note=
<!--
Performance
-->
|max speed mph=234
|max speed note=
|cruise speed mph=204
|cruise speed note=
|stall speed mph=
|stall speed note=
|never exceed speed mph=
|never exceed speed note=
|minimum control speed mph=
|minimum control speed note=
|range miles=1237
|range note=
|combat range miles=
|combat range note=
|ferry range miles=
|ferry range note=
|endurance=<!-- if range unknown -->
|ceiling ft=28500
|ceiling note=
|climb rate ftmin=
|climb rate note=
|time to altitude=
|lift to drag=
|wing loading lb/sqft=21.95
|wing loading note=
|fuel consumption lb/mi=
|power/mass={{cvt|0.100|hp/lb}}
|more performance=<!--</br>
*'''Take-off run:''' {{cvt||ft|0}}
*'''Take-off distance to {{cvt|50|ft|0}}:''' {{cvt||ft|0}}
*'''Landing run:''' {{cvt||ft|0}}
*'''Landing distance from {{cvt|50|ft|0}}:''' {{cvt||ft|0}}-->
<!--
Armament
-->
|guns=3 × .30 in (7.62 mm) [[Browning Arms Company|Browning]] [[machine gun]]s
|guns=3 × .30 in (7.62 mm) [[Browning Arms Company|Browning]] [[machine gun]]s
|bombs=2,260 lb (1,030 kg)
|bombs=2,260 lb (1,030 kg)
}}
}}<ref>[http://www.marylandaviationmuseum.org/pdf/146_spec.pdf Martin 146 Specifications.'] {{webarchive|url=https://web.archive.org/web/20120225110916/http://www.marylandaviationmuseum.org/pdf/146_spec.pdf |date=2012-02-25 }} ''marylandaviationmuseum.org.'' Retrieved: 5 December 2012.</ref>


==See also==
==See also==

Latest revision as of 13:04, 17 September 2024

Model 146
Martin Model 146 during competition c. 1935, USAF photo
General information
TypeHeavy bomber
ManufacturerGlenn L. Martin Company
StatusExperimental prototype
Primary userUnited States Army Air Corps (intended)
Number built1
History
Manufactured1935
First flight1935
Developed fromMartin B-10

The Martin Model 146 was an unsuccessful American bomber design that lost a 1934–1935 bomber design competition to the prototype for the Douglas B-18 Bolo (which was itself soon thereafter supplanted by the B-17 Flying Fortress).

Design and development

[edit]

Although generally satisfied with the speed and bombload of the Martin B-10, the United States Army Air Corps expressed a requirement for a bomber with long range. Two competitions were held in 1934–35: one for fast bombers capable of flying 2,200 miles (3,500 km), and a second for the experimental prototype of a 5,000-mile (8,000 km) bomber.

The Martin 146 was built for the first competition, competing with the Boeing Model 299 (later the B-17) and Douglas DB-1 (later the B-18). Two versions were submitted for the competition, the Model 146 (actual aircraft) and the Model 146A (design only). The only significant difference between the two was the planform, the 146 center section was rectangular with the outer wing being tapered while the 146A had a constant taper.

The Model 146 bore a striking resemblance to the earlier Martin B-10, with the same configurations of turret and cockpits and even the same two Wright R-1820 Cyclone engines – albeit with 33% more power than the 600 hp Cyclones of the original B-10. The biggest differences between this aircraft and the Martin 139 (B-10) was that it was wider, allowing the pilot and co-pilot to sit side by side [1] and was equipped with Fowler flaps, the first large aircraft equipped with them.

The Model 146 was not successful but it led the Martin company to begin research into contemporary aviation technology. Some offshoots included the innovative Martin 145 proposed for the long-range bomber competition as well as the early studies that would lead to the Model 179 (later to emerge as the wartime Martin B-26). The aircraft was eventually returned to the factory and scrapped.

Specifications (Model 146)

[edit]

Data from Martin 146 Specifications[2]

General characteristics

  • Crew: 4
  • Length: 52 ft 0 in (15.85 m)
  • Wingspan: 75 ft 1 in (22.89 m)
  • Height: 15 ft 5 in (4.70 m)
  • Wing area: 729 sq ft (67.7 m2)
  • Gross weight: 16,000 lb (7,257 kg)
  • Max takeoff weight: 17,100 lb (7,756 kg)
  • Powerplant: 2 × Wright R-1820-G5 Cyclone 9-cylinder air-cooled radial piston engines, 800 hp (600 kW) each
  • Propellers: 3-bladed constant-speed propellers

Performance

  • Maximum speed: 234 mph (377 km/h, 203 kn)
  • Cruise speed: 204 mph (328 km/h, 177 kn)
  • Range: 1,237 mi (1,991 km, 1,075 nmi)
  • Service ceiling: 28,500 ft (8,700 m)
  • Wing loading: 21.95 lb/sq ft (107.2 kg/m2)
  • Power/mass: 0.100 hp/lb (0.164 kW/kg)

Armament

See also

[edit]

Related development

Aircraft of comparable role, configuration, and era

Related lists

References

[edit]
Notes
  1. ^ "Model 146." Archived 2007-08-26 at the Wayback Machine marylandaviationmuseum.org. Retrieved: 5 December 2o12.
  2. ^ Martin 146 Specifications.' Archived 2012-02-25 at the Wayback Machine marylandaviationmuseum.org. Retrieved: 5 December 2012.
Bibliography
  • Baugher, Joe. "Martin B-10". Encyclopedia of American Aircraft. Retrieved: 4 July 2007.
  • Taylor, John W. R. "Martin B-10". Combat Aircraft of the World from 1909 to the Present. New York: G.P. Putnam's Sons, 1969. ISBN 0-425-03633-2.
[edit]
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