From: Ryan Gill (rmgill@mindspring.com)
Date: Tue Oct 18 2005 - 13:53:54 PDT
At 9:34 PM +0100 10/18/05, STUART BEENEY wrote:
>Sorry should of said, I'm talking about the towed Artillery like the M1 A2,
>with M114 carriage, I'm just starting to learn about this area of military
>equipment so i may get things wrong
Ok, so I think we're looking for the differences between the three or four versions (I think there are three)
M1 155mm howitzer (WWII)
M114 155mm Howitzer (post war)
M114A1 155mm Howitzer (Vietnam era)
M114A2 155mm Howitzer (Vietnam and later replaced by the M198
The M114s were used for infantry and Airmobile divisions.
>From ST-6-50-19, Field ARtillery Cannon Weapon Systems and Ammunition:
M114A1/A2
MV 564 Meters/Sec
MAx Range 14,600 meters
stepped thread interruipted screw
percussion type M1 firing mechanism
hydropneumatic recoil mechanism
41" max recoil at max elevation
60" max recoil at min elevation
1,500 lb/sq-in Recuperator, N2 gas at 70°
Min elevation 0 Mils
Max elevation 1156 mils
Pintle traverse
right/left traverse 448 mils each
Pusher type spring equilibator
50lb/sq-in tire pressure
12,700 lb weight (traveling and firing configurations)
max rate of fire 4 rpm
sustained ROF- 1 rpm
Prime Mover 5ton 6x6 truck or heavy lift helo
TM 9-1025-200-12
Tube life equivalent full charge
M1 - 2,000 rounds
M1A1 - 7,500 rounds
M1A2 - 7,500 rounds
The A1 Model has a 1 in 25 twist in the gun's rifling, the A2 has a 1 in 20 twist. The change was to make the M114 compatible with the ammo used in the M109 series howitzers. The M114A2 has a machined groove about 4" behind the muzzle which is the only visible difference between it and the M114A1.
Now, to figure out if the changes in the WWII model to the M114 involved anything. I haven't helped you much, but I've given you enough data so when you find more on the M1 155mm howitzer, you'll have more data. Quite likely the only changes were minor things with fire control and with the rifling and tube design. They may have changed the seals a bit too. They may have changed the wheel/tire sizes too. I'll pester a cannon cocker friend of mine and see what he knows.
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