155 m/m Gun Motor Carriage, Mark IX, Model 1920.

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155 m/m Gun Motor Carriage, Mark IX, Model 1920.

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History.

In 1918, Pliny Holt, the chief designer of the Holt AA vehicle, joined the design staff at Rock Island Arsenal, a former military prison that had become a production centre for heavy and light weapons. A few years earlier, the United States had begun to invest in the mechanisation of artillery transport, something that came about with the outbreak of the First World War.
Holt, part of the tractor company of the same name, was the largest manufacturer of tracked vehicles at the outbreak of the First World War and this attracted the attention of the US Army’s top brass.
In 1917, the first self-propelled armoured vehicle, colloquially called the Holt Mark I, built on the hull of a small Holt tractor and armed with a 200 mm howitzer (actually not the first on a Holt hull, but the previous one was designed for anti-aircraft fire), was born, but was not very successful. Shortly afterwards another vehicle was produced, the Mark II, armed with a smaller gun of French origin and a more powerful hull, but after a series of 10 vehicles the idea was discarded.
After a long series of further improved prototypes, the Mark IX (technical name Howtizer Motor Carriage, Mark IX, Model 1920) was completed in Stockton in 1921, and was tested at the Aberdeen Proving Ground the following year. Some of the ideas used in the earlier vehicles were re-applied to this one, and the vehicle was found to be quite performant but further improvements were required, leading to the end of the Mark IX carriage, replaced by successors, alias the Mark IXA (or simply "improved) and the Mark X. Unfortunately, no examples of the IX exist today (apart from one Mark X example), and the idea of such a vehicle itself was temporarily discarded in the US Army due to hostility from the “classic” artillery units.

Armaments and propulsion.

The self-propelled gun was armed with an M1920 155-mm GPF cannon, a licensed copy of the French Canon 155-mm GPF cannon. Unfortunately, the rate of fire possible on this assembly is not known, nor is the quantity of ammunition carried.
As propulsion, the vehicle was powered by a 6-cylinder Sterling GRVT engine delivering 240 hp, capable of propelling the vehicle up to a top speed of 15,7 km/h.

Specifications.

Spoiler

Crew: 3-7
Weight: 21,772 kg
Lenght: 7,34 m
Height: 2,34 m
Width: 2,794 m
Woad: 2.13 m
Engine: Sterling GRVT, 240 hp
Maximum speed: 15,7 km/h
Armament: 1x 155-mm. , M1920
Projectile weight: 43.1 kg
Projectile speed: 853 m/s
Range: 23.7 km
Gun elevation: 0°-65°
Maximum traverse: 11,5°
Recoil: 152,4-60,9 cm

Pictures and drawnings.

Spoiler

Holt IX
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The possible engine:
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Sources.

Spoiler

http://www.landships.info/landships/tank_articles/US_SPGs_Overview.html
http://www.landships.info/landships/tank_articles/Holt_SPGs.html
Off The Mark: US Revamp: Holt Mark IX
https://tradocfcoeccafcoepfwprod.blob.core.usgovcloudapi.net/fires-bulletin-archive/1925/MAR_APR_1925/MAR_APR_1925_FULL_EDITION.pdf
Holt/Christie SPG US -PICTURES COMING HOPEFULY- - #2 by Kriegerfaust007 - Suggestions - Enlisted
Canon de 155 mm GPF - Wikipedia
Ещё больше Холтов хороших и разных ! - Пещера злобного Буквоеда — LiveJournal
Sterling Engine Co.
United States Self Propelled Guns

1 Like
2

The lack of onboard ammo storage would be a major factor in determining if this vehicle is viable for game purposes or not.

2 Likes
3

this would be joint oldest ground vehicle in the game with the Char 2C. would love to see more interwar designs

+1

1 Like
4

We can’t have people pushing around field guns, it would have no competitive advantage in the game. If It did have onboard stowage, I imagine it would be similar to the archer in mobility, with the protection of a t55e1 (you can mow the poor lads heads off with mg)

1 Like
5

At least this SPG appears to be facing forward, unless I missed something. But yeah, tank-based SPGs were still very much in their infancy during the interwar period so I don’t think there would be any sort of tow-behind ammunition trailer available.

2 Likes
6

I think more important is the lack of onboard crew except for a driver lmao

7

In the pics there is only the driver because Idk, but you can see the seats for at least 4/5 crew members.

8

reserve SPG ? xD

1 Like
9

The crew ‘‘seats’’ are nowhere near their operating positions, which would be outside the vehicle as shown in the pics. This is nothing but a self-propelled field gun, not an independent fighting vehicle. It’s like asking for a horse towing an AT gun to be added to the game…

10

I love how open the vehicle is. And it has like what, 2 crew? It is going to be very rewarding if used properly…but because of the big size, its an easy plane target even for biplanes in reserve tier, not to mention frequent autocannons like those on the pz.II. I guess it would work how some Rank I French tanks work; only researchable after unlocking 2-4 Rank II Tanks.

1 Like
11

And getting within like what 1KM near arty with either kill the crew or take out the tracks, breech, crew, barrel, transmission, and fuel tanks.

12

That’s why we need a spg only game mod, with big maps.

13

And exactly how many people are willing to use only SPGs and TDs in hours-long sniping sessions with poor rewards?

1 Like
14

Put higher rewards.

15

Man if they do then there will be ‘pros’ camping for rewards, AND some other chad will want a gamemode solely for medium tanks, etc. So it is best not the make a gamemode only for SPGs.

16

It happens.

17

Yeah.