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 BRITISH ARTILLERY IN WORLD WAR 2

 4.5-INCH HOWITZER

Updated  17 Novemberr 2007

Conversion factors to metric measurement

 Ordnance, Q.F. 4.5-inch How Mk 2 on Carriage Mk 1P

 Picture List

 The 4.5-inch Howitzer was introduced before WW1.  It was a 'light howitzer' and the equivalent of the German 10.5 cm howitzer of that period.  It was used in various theatres in the first 2 or 3 years of WW2.  During the 1930s it was modified for vehicle towing, first with solid rubber types (Mk 1R carriage) then the Mk 1P with with pneumatic tyred wheels and appropriate brakes.  It was replaced by the 25-pdr.  It was important after the fall of France because only a relatively small proportion of 4.5-inch How were lost.  This gun had nothing is common with the 4.5-inch Gun or 4.5-inch AA or Naval guns.

Calibre

 4.5 inches

Barrel length
Bore length

 70 inches
 13.4 calibres

Rifling

 32 grooves, 1 in 20 uniform twist

Chamber capacity

 100 cubic inches

Barrel

 Built-up A tube  & jacket

Breech

 Horizontal  sliding block

Recuperator

 Hydro-pneumatic

 Sights

 Reciprocating & non-calibrating

Carriage configuration

 Box trail

Max elevation

  -5 to  45

Top traverse

 3 L & R

Loading angle

 

Basic Weight

 1.5 tons

Length (muzzle to towing eye)

 9.1 feet

Trunnion height

  3.8 feet

Width at wheel hubs

 6.7 feet

Standard HE Shell Mk 16

Length (less fuze)

13.42 inches

Calibre radius head

 3

 Body Diameter

 4.49  inches

Driving Band Diameter

 4.64 inches

Weight (incl fuze)

 35 lbs

Explosive Weight

 4.3 lbs

Charge

New Gun MV

RT MV

RT Max Range

Time of Flight @ Max Range

Probable Error @ Max Range

Approx  Propellant Weight

 

 1

  600 f/s

550 f/s

2,700 yds

19 secs

50 yds

0.4 lbs

 

 2

613 f/s

630 f/s

3,300 yds

22 secs

45 yds

0.5 lbs

 

 3

705  f/s

700 f/s

3,900 yds

24 secs

45 yds

0.6 lbs

 

4

827 f/s

820 f/s

4,900 yds

28 secs

40 yds

0.7 lbs

 

5

1017 f/s

1000 f/s

6,600 yds

35 secs

45 yds

1 lbs

 

Rates of fire

Gunfire

Intense

Rapid

Normal

Slow

Very slow

Rounds/Minute

 

 4

3

2

1

 

Normal Detachment

 6 men

Gun Tractor

 

Artillery Trailer

 No 26, 30

1st Line Ammo (per gun)

  HE

VARIANTS

 The Mk 1 ordnance had a 1:15 twist.  

Picture List

Q.F. 4.5-inch How Mk 2 on Carriage Mk 1P - front view
Q.F. 4.5-inch How Mk 2 on Carriage Mk 1P - rear view

Gun Detachment duties in action:

No 1

Detachment Commander

No 2

Breech and gun rule

No 3

Layer, fire gun

No 4

Loader

No 5

Ammunition

No 6

Ammunition

Equipment Publications:
(Post WW1)
Range Tables Part 1:
40/WO/6503           Standard projectile, 1918.
40/WO/9039           Standard projectile, HE fuzed No 106, 1924.

26/Manuals/913      Standard projectile, 34 lbs, 3 CRH, 1931.
26/Manuals/2555    
HE, Mk 1D (Streamline), 1940.
26/Manuals/2763    Supplement for Smoke Shell, BE, Fuzed T&P No 220, 1941.
 

Gun Drill:
26/Manuals/1434    
QF 4.5-inch Mks 1 & 2 Howitzer on Mks 1 & 1R Field Carriage, 1934.
26/GS Pubs/655    
QF 4.5-inch Mks 1 & 2 Howitzer on Mks 1 & 1P Field Carriage, 1940.

Handbook:
26/Manuals/153    QF 4.5-inch Mks 1 & 2 Howitzer on Mks 1 & 1A Field Carriage, 1927.
226/Pubs/33        QF 4.5-inch Mks 1 & 2 Howitzer on Carriage 4.5-inch Howitzer Mks 1, 1P, 1PA & 1R, 1940.

Identification List:
57/Guns/421        QF 4.5-inch Mks 1 & 2 Howitzer on Mks 1 & 1R Field Carriage, Carriage and Ammunition Wagon
                          Limber Mks 1 & 1R, Ammunition Wagon QF 4.5-inch Howitzer,
1928.
57/Guns/2283      QF 4.5-inch Mks 1 & 2 Howitzer on Mk 1P Carriage, & No 26 Artillery Trailer, 1941.

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 Copyright 2005 - 2008 Nigel F Evans. All Rights Reserved.