Tundzha



Overview

Tundzha

Bulgarian Tundzha self-propelled mortar system during an exercise in 2016.
Source: US Marine Corps - © Public domain

Origin
Bulgaria
Type
Self-propelled mortar
Entered service
1980's
Status
In service
Development
1976 - 1981
Developer
Bulgaria - NITI Kazanlak
Production
1980's - Mid 1990's
Producer
Bulgaria
Number produced
At least several dozen
Designations
Тунджа
SMM 74 B1.10
Notable users
Bulgaria

Description

Introduction

The Tundzha is a self-propelled mortar of Bulgarian origin. It was developed as an alternative to towed heavy mortars with better mobility in the field and the ability to quickly relocate after firing.

Layout

The Tundzha combines the MT-LB tracked vehicle with a 120mm PM-43 or 2B11 mortar. The mortar is fitted in a special cradle with a large buffer on either side of the tube in order to reduce the recoil to a level that is bearable for the suspension of the MT-LB. Two large roof hatches are fitted. These allow for the mortar to be fired from the vehicle and to be lowered inside when not in use.

Firepower

The Tundzha is fitted with a rearward facing muzzle loaded 120mm PM-43 mortar. This World War 2 era mortar has a maximum range of 5.7 km. A total of 58 shells are carried. Some sources indicate a total of 68 shells. The improved Tundzha-Sani carries the 120mm 2B11 mortar, with an increased range of 7.1 km.

Protection

The steel armor protects the crew of shell splinters and small arms fire. In the firing position the large roof hatches are open. When operating the mortar the crew is partially exposed.

Mobility

The MT-LB chassis is known for its good cross country mobility. The tracked chassis has a very low ground pressure and low center of gravity. It is likely that the amphibious capability of the MT-LB chassis has been retained.

Users

The Tundzha and Tundzha-Sani are in service with Bulgaria.

Variants

SMM B1.10 Tundzha
Original production version of the Tundzha with 120mm PM-43 mortar. This has a maximum range of 5.7 km.
SMM 74 B1.10 Tundzha-Sani
Improved variant with 120mm 2B11 Sani mortar. Maximum range is 7.1 km.

Media

Details

Facts Tundzha
General
Origin
Bulgaria
Type
Self-propelled mortar
Crew
5
Dimensions
Weight
12.1 t combat load
Length
6.45 m
Width
2.82 m
Height
1.89 m
Armament
Type
120mm mortar
Mount
Small remote operated turret
Ammunition
58 shells
Elevation
+45° to +80°
Traverse
-26° to +26° at maximum elevation
Sight
MPM-44
Chassis
Chassis type
Tracked chassis, 6 roadwheels
Layout
Drive sprocket front, idler rear
Ground pressure
0.46 kg/cm²
Tread
2.5 m
Track on ground
3.7 m
Suspension
Torsion bar
Automotive
Engine
YaMZ-238V
Power output
240 hp
Fuel
450 L
Mobility
Speed
62 km/h on road
30 km/h off road
5 - 6 km/h afloat
Range
500 km on road
Power to weight ratio
19.7 hp/t
Obstacle crossing
Ground clearance
0.4 m
Wall
0.7 m
Trench
2.8 m
Gradient
35°
Fording
Amphibious
Protection
Armor type
Steel
Armor thickness
14 mm front
7 mm top, sides and rear

Related articles

120mm PM-43

Early model Tundzha are armed with the 120-PM-43 mortar.

Read more about 120mm PM-43

120mm 2B11 Sani

The Tundzha-Sani is armed with the longer range 2B11 Sani mortar.

Read more about 120mm 2B11 Sani

MT-LB

The Tundzha is based on the chassis of the MT-LB tracked armored personnel carrier / prime mover.

Read more about MT-LB