Martin 139WC

This page is about the Chinese Bomber Martin 139WC. For other versions, see Martin 139 (Family).

Martin 139WC

␗DB-3A

Martin 139WC

␗DB-3A

China

I Rank

Battle rating:

AB	RB	SB
1.3	1.3	1.7

Class:

Bomber

Frontline bomber

Research:2 900

Purchase:700

Description

The Martin 139WC, often referred as the 馬丁式轟炸機 (Martin Bomber), was the export version of Martin B-10 bomber for the NRAAF in 1936. As part of the 50th birthday cerebration of Chiang Kai-Shek's fundraising campaign, some of the funds raised were taken as the fund to purchase nine Martin 139W bombers to strengthen the NRAAF; these aircrafts were in service alongside with some He 111A series and SM.72 during the early days of the total outbreak of Sino-Japanese War but with minimal efficiency. The most famous operation carried out by Martin 139WC was the propaganda leaflet "bombing" to Kyushu on 20th May, 1938 with the help of long-range radio and US instructors, 4 years before the Doolittle Raid on April 1942; as the bomber was already obsolete and new Soviet/US-built bombers arrived in China, the Martins were soon phrased out and left as training aids for bomber crews as late as 1945.

Introduced in Update 1.91 "Night Vision" with the Chinese tech tree, although having a rather peculiar aerodynamic design like a boat and less than desired self-defense firepower, Martin 139WC can still prove its worthiness with up to 600 kg bombs at its rank and deliver destruction to enemy stationary targets.

General info

Flight performance

Max speed

at 2 438 m370 km/h

Turn time21 s

Max altitude7 380 m

Engine2 х Wright Cyclone R-1820G2

TypeRadial

Cooling systemAir

Take-off weight7 t

Characteristics	Max Speed (km/h at 2,438 m)		Max altitude (metres)	Turn time (seconds)		Rate of climb (metres/second)		Take-off run (metres)
	AB	RB		AB	RB	AB	RB
Stock	353	340	7380	21.9	22.7	5.6	5.6	600
Upgraded	389	370		20.1	21.0	10.5	7.7

Details

Features
Combat flaps	Take-off flaps	Landing flaps	Air brakes	Arrestor gear
✓	✓	✓	X	X

Limits
Wings (km/h)	Gear (km/h)	Flaps (km/h)			Max Static G
		Combat	Take-off	Landing	+	-
564	235	328	313	235	~7	~3

Optimal velocities (km/h)
Ailerons	Rudder	Elevators	Radiator
< 200	< 270	< 290	> 307

Survivability and armour

Crew4 people

Speed of destruction

Structural564 km/h

Gear235 km/h

The Martin 139WC does not have any armour. There are 4 self-sealing fuel tanks, with 2 in each wing.

Modifications and economy

Repair costBasic → Reference

AB111 → 138

RB159 → 198

SB211 → 263

Total cost of modifications2 960

885

Talisman cost190

Crew training200

Experts1 000

Aces20

Research Aces96 000

Reward for battleAB / RB / SB

10 / 30 / 50 %

100 / 100 / 100 %

Modifications

Flight performance	Survivability	Weaponry
Fuselage repair Research: 150 Cost: 45 40 Radiator Research: 150 Cost: 45 40 Compressor Research: 220 Cost: 65 55 Wings repair Research: 185 Cost: 55 45 Engine Research: 185 Cost: 55 45 Engine injection Research: 480 Cost: 145 120	Airframe Research: 220 Cost: 65 55 Cover Research: 480 Cost: 145 120	bmg30_turret_belt_pack Research: 150 Cost: 45 40 100 GPs Research: 150 Cost: 45 40 200 GPs Research: 220 Cost: 65 55 bmg30_turret_new_gun Research: 185 Cost: 55 45 GP250 Research: 185 Cost: 55 45

Armaments

Suspended armament

List of setups (4)

Setup 16 x 100 kg SAP 100M bomb

Setup 26 x 100 kg No.1

Setup 32 x 200 kg No.1

Setup 42 x 250 kg GP 250 bomb

The Martin 139WC can be outfitted with the following ordnance:

• 6 x 100 kg SAP 100M bombs (600 kg total)
• 6 x 100 kg No.1 bombs (600 kg total)
• 2 x 200 kg No.1 bombs (400 kg total)
• 2 x 250 kg GP 250 bombs (500 kg total)

Defensive armament

3 х Turret7.62 mm Browning machine gun

Ammunition600 rounds

Fire rate1000 shots/min

The Martin 139WC is defended by:

• 1 x 7.62 mm Browning machine gun, nose turret (600 rpg)
• 1 x 7.62 mm Browning machine gun, dorsal turret (600 rpg)
• 1 x 7.62 mm Browning machine gun, ventral turret (600 rpg)

Usage in battles

As a bomber, the Martin 139WC does the job well. It can easily reach bombing points before interception and can damage a base with two 250 kg bombs, and can then turn away and return to base to rearm. If enemy fighters are at altitude, consider using clouds for cover, or entering a shallow dive towards friendly fighters, or the airfield.

This aircraft works very well defensively and can be very effective when flown with a squadmate. As this bomber is very manoeuvrable, it can out-turn most enemy fighters, but lacks the firepower to deal with them effectively, it has no fixed guns and is only equipped with .30 calibre machine guns, and controlling them manually in a dogfight isn't really a viable option. But when playing with a friend, the Martin 139WC can engage a fighter, and while manoeuvring, can draw the enemy into a low energy state, making it a very easy target to take out.

On your own, you can still comfortably dogfight one-on-one with most German and Italian monoplane aircraft, but if this fight is away from friendlies, another enemy fighter could engage with you, and being such a large target, a 2-on-1 fight likely won't go in your favour. As you are a big target, and with two enemies around you, one is likely going to take out a critical component sooner or later.

Try diving towards friendlies before engaging in a dogfight, the closer you are to your allies, the more likely it is that they'll come to your aid, the further away you are, the more likely it is that an enemy will join the fight instead.

If there are no enemies around later on in the match you can attack light ground targets by manually controlling your nose gunner, just make sure to watch out for any trees or ground hazards as there will be a delay before you can switch back to direct control of the aircraft.

Manual Engine Control

MEC elements
Mixer	Pitch	Radiator			Supercharger	Turbocharger
		Oil	Water	Type
Controllable	Controllable Not auto controlled	Controllable Not auto controlled	Controllable Not auto controlled	Separate	Not controllable 1 gear	Not controllable

Pros and cons

Pros:

• Very manoeuvrable, has an impressively high turn rate for a bomber
• The frontal gunner, while only having a .30 cal, can be used as a manual weapon if you keep the front of the plane on an enemies tail, or for attacking ground targets
• As it's a less well-known aircraft, enemies may not know how to effectively fight it
• It can easily take fire from machine guns on the wings, and in general is fairly survivable
• While having limited fire arcs on the rear turrets, they cover a wide area and can surprise enemies that don't know they're there

Cons:

• It's a large target, and even though the critical components are hard to hit individually, the large wings and tail will accumulate damage over time
• Maximum bombload of 2 x 250 kg bombs is not a lot
• No armour protection at all, leaving it vulnerable to even small-calibre MG.
• Despite its comparatively good speed, most Axis aircraft can catch up to it easily
• Rear gunners have a slightly restricted field of view over the tail, where the gunners can't fire

History

Although the Martin B-10 was made obsolete in late 1930s when Boeing's B-17 won the bid for a new long-range bomber, the overall performance of the B-10 was still sufficient for countries in dire need for high-speed bombers, including the Republic of China which had next to no aviation industry at the time.

Records show that the ROCAF purchased the Martin B-10 (designated the Martin 139WC) in 1936; it was in fact the fastest aircraft on Chinese soil which was at the time mostly biplanes. They served as part of the ROCAF bomber forces and joined the first bombing operations of mainland Japan in 1938 when two bombers took off from Hankou (now a district of Wuhan City) and dropped propaganda leaflets over Kyushu via Ningbo (which was still under Nationalist control at the time) on 19th May 1938. The crew returned safely to Nanchang on the 20th, but any further records of the Martin 139 in the Chinese Theatre are sparse.

Media

Skins

• Skins and camouflages for the Martin 139WC from live.warthunder.com.

See also

Related development

• B-10B

Aircraft of comparable role, configuration and era

• Tupolev SB
• Martin 167 Maryland
• Mitsubishi Ki-21
• Heinkel He 111
• Fiat BR.20

External links

Paste links to sources and external resources, such as:

• topic on the official game forum;
• other literature.

Glenn L. Martin Company
Attackers	AM-1
Bombers	B-10B · B-26B · PBM-1 · PBM-3 · PBM-5A
Jet bombers	B-57A* · B-57B*
Export	Martin 139WC · Martin 167-A3 · B-26C
	* These aircraft were license-built from The English Electric Company Limited who developed and built the British English Electric Canberra.