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HOI4 Dev Diary - Amphibious Vehicles and Research

Hi everyone! Another wednesday means its diary time! Today we will be talking about some quite big balance changes to tech as well as some new... watery toys :)

Amphibious Armored Vehicles

With Man the Guns we are adding two new classes of vehicles. Amphibious Tractors (AMTRACs) and Amphibious Tanks. AMTRACs were built in large quantities and used both in the Pacific by US Marines with good success as well as in Europe during major river crossings such as the Allied crossing of the Rhine. An AMTRAC is a amphibious tracked vehicle that offers soldiers protection, and depending on model, firepower when conducting landings.

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For heavier armor and firepower, amphibious tanks were developed. The allies used quite a lot of the Duplex Drive Shermans during D-Day. The idea was that the tanks would swim to the beach, then drive on to assault the German fortifications. The Sherman DD itself had some design problems, as it was designed for only 30cm high waves… which aren't exactly rare at sea. Many of them were also unloaded from their landing ships much too far out and sunk in the waves. Some beaches had good results, but for example Omaha beach was a disaster where most of them were lost. The Germans also planned for tanks for Operation Sealion, but experimented with snorkels and driving along the bottom instead. These were instead used during Barbarossa. The Japanese went more in the direction of attachable “flotation parts” with the Ka-Mi and Ka-chi tanks, making them look like tiny little warships. They never got the same large scale testings as the American tanks, but to me at least, seem to have been a more reasonable technical solution.

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These things combined means that you can design divisions to punch through heavily defended landing sites. Quite useful late game! These divisions are also great for when the enemy has fortified across a large river. On the flip side they are quite expensive to make, less fuel efficient and a little slower for what you get so you should have some plan for them before investing. Amphibious vehicle battalions also use your special forces limit, just like marines.

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Man the Guns comes with 10 unique 3d models for the amphibious tanks:
mtg_amphibious_eng_sov.png

mtg_amphibious_ger.png

mtg_amphibious_usa_generic.png

mtg_amphibious_jap.png


The mechanized infantry AMTRACs can be found in the Infantry tech tab while the Amphibious tanks are a branch of light tanks (the tier 2 amphibious tanks are close in stats to the 1939 medium tanks):

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Research Changes
We are changing up some things when it comes to technologies as well. Because we have been steadily adding more, and are adding a bunch more with Man the Guns, we will be adjusting the base research speed to be faster. Probably something like +10%, but we haven’t locked that down yet.

We are also changing how the formula works for calculating how long it takes to research things. Instead of a research bonus lowering the cost of the research, bonuses now affect the speed of research. This means that an old -50% cost modifier is roughly the same as a +100% speed modifier now. I say roughly because speed modifiers stack a lot better and in less odd ways when there are many of them. This essentially means that you can no longer get instant techs by stacking various modifiers, just really fast research.

We have also changed how ahead of time works and the Ahead of Time Bonuses from focuses etc. no longer give you a percentage off, but a number of years off. This is important because it makes certain tech rush strategies where you simply bypass much of the tree by chaining ahead of time bonuses not work. We feel that these things will make things play a lot saner, and stop ahead of time researching to be banned in some MP groups ;)
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The other change we are doing is to allow certain techs to get a bonus from XP. All doctrines as well as certain modules like torpedoes get a research boost when spending XP on them. This does two things for us: On the one hand we are not happy that one of your research slots is basically always locked to land doctrine research, and also the fact that we don’t really want nations to have maxed out their doctrines by the start of the war. So doctrines now get a bit slower to research, but by spending XP (benefitting the nations we want to have an edge here, like the axis) you will be researching faster than before. The other thing is to model certain stuff that were notoriously hard to get working right, like torpedoes, which for some periods of time had something like a majority failing to actually detonate when hitting a target. We want nations who get to see action here or dedicate training time on it to have a bit more of an edge.
upload_2018-10-3_15-34-39.png


That’s it for this time! Do not miss that we are starting streaming of Man the Guns gameplay today, so tune in to see the new USA tree at 16:00 CET at https://www.twitch.tv/paradoxinteractive
 
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Please apply your logic regarding doctrines and torpedoes to carriers:
 
I really like the idea of using XP to boost research speed. We can use any of the three xp types in any kind of research, right?
 
We have also changed how ahead of time works and the Ahead of Time Bonuses from focuses etc. no longer give you a percentage off, but a number of years off. This is important because it makes certain tech rush strategies where you simply bypass much of the tree by chaining ahead of time bonuses not work. We feel that these things will make things play a lot saner, and stop ahead of time researching to be banned in some MP groups ;)

Awesome. This has been a personal bugbear for a while.
 
Thats the problem with the mega big country ones ;D This one is average sized, yet juicy imo ;)
Juicy indeed, the whole subject of adding amphibious vehicle is a surprise to be sure, but a welcome one :D
 
Awesome. This has been a personal bugbear for a while.
Yes it lead to crazy stuff such as Tech rushing 1944 fighters with 2000+hp Engines in 1940 while others fly around with 1936 fighters with 1000hp Engines.

Please apply your logic regarding doctrines and torpedoes to carriers:
Several ship Components will be boosted by experience and naval doctrines will as well.
 
@podcat

How many new admirals have you added so far? :)
 
What countries will get 3D models and on what vehicles will they be based?
Here is the full list of vehicles (3d models are as you can see in the picture in the diary):
LVT-1(A)
Sherman DD
LVT-2
LVT-4
Type 2 Ka-Mi
Type 3 Ka-Chi
Type 4 Ka-Tsu
Schwimmpanzer II
Tauchpanzer III
Land-Wasser-Schlepper
Land-Wasser-Schlepper II
T-40
PT-76
Valentine DD
Cromwell DD
Terrapin
 
Great. Spending XP for research speed is a very much needed and realistic change. How much faster will the research be if XP is spent?
about +100% is our standard. it can vary by tech
 
No French landing tanks? :(
 
Looks great. MtG is looking like the best expansion so far.

Curious though, now that you have amphibious vehicles do have any thought of bringing LST type ships that brought these vehicles to the beach into the game?
 
Curious though, now that you have amphibious vehicles do have any thought of bringing LST type ships that brought these vehicles to the beach into the game?
we considered it, but then we kinda wanted to redo everything about invasions... and that was too big to fit into MTG. So hey maybe sometime in the future. I've never been 100% happy with the transport techs. it kinda hard-locks something that should be a production issue. but its nice and easy :)
 
@podcat
Are there any plans to add 3D models for anything else ? Assault guns, Self propelled arty? The stug 3 model is the same as the pz4 model, same with Hummel I think.

I would pay for some 3D model packs
 
@podcat
Are there any plans to add 3D models for anything else ? Assault guns, Self propelled arty? The stug 3 model is the same as the pz4 model, same with Hummel I think.
cant really say more than that we have discussed it for sure. but its not a MTG thing.... time will tell!

I would pay for some 3D model packs

Yeah I have heard a lot of ppl say that. Its something we are looking into. I too wanna have more cool models in the game