NAV shouldn't be effective against fleets at sea

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lonewolf371

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Apologies if this post belongs in the suggestions forum.

So right now I think that naval bombers (i.e., torpedo bombers) are overpowered. I'll try to outline why I think it's so, and perhaps suggest a couple of changes that might make things line up better with history and give more interesting gameplay.

The main thing I'm noticing is that the orthodoxy right now for designing carrier fleets is the following: 50% fighters and 50% NAV (naval bombers). CAS, which are used as a surrogate for the historical dive bombers, are usually felt to be useless in naval combat. However, this does not align with their records in World War 2.

Naval Bomber WW2 Record
Naval bombers were involved in a number of decisive moments in WW2. The British, Americans, and Japanese recognized the potential for these type of planes early on and worked on designing them some in the interwar period. The first major action for torpedo bombers was the Battle of Taranto, in which 21 British torpedo bombers annihilated the Italian Royal Fleet in port during a night attack. This required a modification to the British torpedoes that allowed their use in shallow water.

Roughly one year later the Japanese built on this for their attack on Pearl Harbor, creating the best aerial torpedo in the world at the time that could be launched at high speeds and had reliable operating characteristics. The Japanese also had to attack in shallow water, and they practiced accomplishing this in exercises off the coast of Japan. The Japanese attack on Pearl Harbor had a similar effect to Taranto, with the American fleet in port being obliterated.

That was the good part - outside of these actions, torpedo bombers are largely absent in action at sea. There are a few counter cases - for example, torpedo bombers more or less disabled the Bismarck and later allowed the British fleet to sink it. The Bismarck was alone and had no air cover. Japanese torpedo bombers also destroyed the Yorktown at Midway, but this was after the Yorktown had been damaged by dive bombers. The sinking of the Lexington is one of the few examples of torpedo bombers sinking a ship that had appropriate air cover, but this required a large, coordinated attack of all 3 carrier plane types. The Hornet suffered a similar fate.

Later in the war, the Americans sank the uncovered Yamato & co. with torpedo bombers.

Dive Bomber WW2 Record
Dive bombers - in particular, the Douglas SBD Dauntless - comprised almost the entire U.S. WW2 kill record - six carriers, 14 cruisers, and six destroyers.

The first major action was the Battle of the Coral Sea, where Dauntless Bombers sunk two carriers - a light carrier and a main fleet carrier.

The bulk of this happened at the Battle of Midway, where an ineffective torpedo bomber attack distracted the Japanese and allowed the dive bombers to obliterate almost the entire Japanese carrier force. They also sunk the carrier Ryujo during the Solomon Islands Campaign.

Summary
Torpedo bombers (i.e., NAV) were devastating to ships without air cover or ships docked in port - main examples being Taranto and Pearl Harbor. Torpedo bombers were also effective at destroying disabled ships or ships without air cover. What was the reason for this? Well, torpedoes are actually quite slow - barely faster than a ship - so if they're launched too far out, most WW2 ships have the speed to avoid them. If a fleet has proper air cover, torpedo bombers will typically be shot down prior to getting close enough to drop their payload effectively. Dive bombers are much more accurate, and once they've begun their attack, are quite difficult to stop. This makes them more effective against fleets at sea.

Suggestions
Naval port strikes should be extremely effective when the port owner doesn't maintain air superiority.

For ships at sea, speed should be included in the defense calculation for a torpedo attack, as well as some resemblance of air cover/air superiority that forces torpedo bombers to launch their attacks from further away. Regional air superiority from land-based planes should not be included in the calculation, as these wouldn't arrive in time. Fleets with planes should engage at very large distances - typically too much for battleships or screens to engage.

Where torpedo bombers should really be effective at sea are when a fleet lacks localized air cover - this would allow the bombers to get in close and launch their torpedoes without giving ships room to maneuver. Keeping the air superiority calculation localized would reduce battleship spam and give a new focus to carriers, and screen ships could also give a (minor) bonus to air coverage to encourage their use, but obviously not as much as carriers. If tactics are introduced to naval battles, you could also take into account combined-arms tactics that the Japanese used to launch coordinated attacks from different altitudes and with different weaponry. Nations should be sure to exercise air superiority or interception missions to protect their fleets in port.

Some elements of this might already be in the game - maybe I haven't read enough of the Wiki, but I still think this post outlines an overall philosophy for naval warfare that would give it a bit more depth and historical accuracy.
 

Alex_brunius

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I think your drawing the wrong conclusions here.


From my reading the reason why USA didn't sink more ships at sea with torpedo bombers actually is mainly down to their air dropped torpedoes being absolutely crap. So bad in fact that I doubt they even could have sunk ships in port with them had they gotten the opportunity to try.

They didn't get them working properly ( possible to drop from high speed and above 100 m altitude ) until 1944, and by then there were very few important Japanese capital ships at sea left to sink ( except the Musashi and Yamato, which they put so many holes in they looked like Swiss cheese ).

USA also had twice as many dive bombers as they had torpedo bombers on their Carriers early on, which helped since they had excellent dive bombers and heavy bombs.


On the other hand the Japanese had pretty weak bombs on their dive bombers, incapable of doing serious damage to US Capital ships. So pretty much all US warships sunk at sea by Japanese airpower was sunk by Torpedo bombers, not dive bombers ( Prince of wales, Repulse and all the Carriers sunk ).

The Japanese air dropped torpedoes were excellent, and they also brought more torpedo bombers then dive bombers on their Carriers and always considered their "kanko" or Carrier Attack Bombers which they called their torpedo bombers as the main offensive tool.


So what we need here IMO is something which can model how different nations had different doctrine & equipment which could allow both dive bombers and torpedo bombers to succeed or fail at sinking ships at sea.
 
Last edited:

keatsv

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The first major action was the Battle of the Coral Sea, where Dauntless Bombers sunk two carriers - a light carrier and a main fleet carrier.

No Japanese fleet carriers were sunk at the Coral Sea. I agree, however, that CAS should be far more useful in sea battles (in a way that makes sense, not just because they obliterate CV air wings when launched from land bases). Ju87s conducting naval strikes cannot even sink unescorted convoys. I am really hoping MtG will address the aerial war, because it is impossible to make the naval war model WWII reasonably well without doing so.
 

uberjedi

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No Japanese fleet carriers were sunk at the Coral Sea. I agree, however, that CAS should be far more useful in sea battles (in a way that makes sense, not just because they obliterate CV air wings when launched from land bases). Ju87s conducting naval strikes cannot even sink unescorted convoys. I am really hoping MtG will address the aerial war, because it is impossible to make the naval war model WWII reasonably well without doing so.

I just want to add that two japanese fleet carriers (Shokaku & Zuikaku) suffered so significant losses at Coral Sea that neither could participate in the Midway operation. One was damaged and the other got its air wings depleted.
 

Cpack

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Don't forget the Sinking of Prince of Wales and Repulse with 17 Nell torpedo bombers (two squadrons from the Genzan Air Group) and 26 Betty bombers
 

Louella

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So what we need here IMO is something which can model how different nations had different doctrine & equipment which could allow both dive bombers and torpedo bombers to succeed or fail at sinking ships at sea.
Techs for torpedoes and/or bombs ?

Might also help with tech rushing. You might be able to get nav3s early but without the advanced torpedoes as well they won't be overly effective.

Could even help mitigate strategic bombing early on, if there's a heavy bomb tech.
 

iDovke

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There could be some branches on naval or air doctrines to increase dive or torpedo bombers. Actually there should be more choices in doctrines in general.
 

lonewolf371

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I think your drawing the wrong conclusions here.


From my reading the reason why USA didn't sink more ships at sea with torpedo bombers actually is mainly down to their air dropped torpedoes being absolutely crap. So bad in fact that I doubt they even could have sunk ships in port with them had they gotten the opportunity to try.

They didn't get them working properly ( possible to drop from high speed and above 100 m altitude ) until 1944, and by then there were very few important Japanese capital ships at sea left to sink ( except the Musashi and Yamato, which they put so many holes in they looked like Swiss cheese ).

USA also had twice as many dive bombers as they had torpedo bombers on their Carriers early on, which helped since they had excellent dive bombers and heavy bombs.


On the other hand the Japanese had pretty weak bombs on their dive bombers, incapable of doing serious damage to US Capital ships. So pretty much all US warships sunk at sea by Japanese airpower was sunk by Torpedo bombers, not dive bombers ( Prince of wales, Repulse and all the Carriers sunk ).

The Japanese air dropped torpedoes were excellent, and they also brought more torpedo bombers then dive bombers on their Carriers and always considered their "kanko" or Carrier Attack Bombers which they called their torpedo bombers as the main offensive tool.


So what we need here IMO is something which can model how different nations had different doctrine & equipment which could allow both dive bombers and torpedo bombers to succeed or fail at sinking ships at sea.
While it's true that the Japanese had much better torpedoes, all the examples of the Japanese sinking American ships either 1) had the American ships in port or 2) had coordinated, combined arms assaults of dive bombers, torpedo bombers, and fighters - which was in essence the Japanese doctrine for the carrier forces. In no way does the current game optimum of 50% fighters and 50% torpedo bombers occur for any nation historically.

As for the Americans, the reason wasn't just that the Americans had bad torpedoes - yes, they scored some hits that didn't detonate - but also that torpedoes are slow and dodgeable. Even in the Prince of Wales & co. incident that others mentioned (when the British had no air cover), a British ship was able to dodge 19 torpedoes alone before finally being struck. The factor you mentioned is but one of many that affected torpedo bombers and doesn't really disprove my original conclusion.

I agree that naval doctrine should change a bit which one is more effective, but CAS and NAV for naval purposes should start roughly equal - possibly CAS should actually have an advantage - with nations able to specialize in either one (and the trees should be balanced). I also think there should be some sort of combined-arms bonus to using all 3. Initially, NAV should be somewhat ineffective against combined-arms fleets unless the player puts some efforts into developing their torpedoes (as Japan did historically).
 

Alex_brunius

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While it's true that the Japanese had much better torpedoes, all the examples of the Japanese sinking American ships either 1) had the American ships in port or 2) had coordinated, combined arms assaults of dive bombers, torpedo bombers, and fighters - which was in essence the Japanese doctrine for the carrier forces. In no way does the current game optimum of 50% fighters and 50% torpedo bombers occur for any nation historically.

Edit:
Okay for American ships, but not British...

The sinking of Prince of Wales and Repulse was done by only torpedo bombers, without any support of fighters or dive bombers.

And in cases of sinking of the American Carriers at sea it was always the Torpedoes that dealt them the mortal "blow" which caused the sinking or scuttling of them. I don't deny the values of having fighters or dive bombers present in some ( but not all ) of these attacks, but their role was more of support, escort and AA suppression then doing damage to the capital ships.


As for the Americans, the reason wasn't just that the Americans had bad torpedoes - yes, they scored some hits that didn't detonate - but also that torpedoes are slow and dodgeable. Even in the Prince of Wales & co. incident that others mentioned (when the British had no air cover), a British ship was able to dodge 19 torpedoes alone before finally being struck. The factor you mentioned is but one of many that affected torpedo bombers and doesn't really disprove my original conclusion.

All attacks at the time were slow and dodge-able, including dive bombers.

When attacking PoW and Repulse 8 out of 49 torpedoes dropped were hits, which is a 16% hit rate. This is better or comparable to most dive bombing attacks made against ships. Even against mostly stationary ships in Pearl harbor no better then 19% hit rate was achieved by the dive bombers of the second wave ( and that was by some of the worlds best trained dive bombing pilots ).


Due to their bad torpedoes the American torpedo bombers had to fly at less then half speed compared to Japanese ones, which made them much easier to dodge. And duds wasn't the only thing they struggled with, they also frequently went of course, outright sank or were destroyed when hitting the water.



Another thing to consider when it comes to the Attack on Pearl Harbor is that they actually used 3 types of attacks from bombers. Torpedo bombers, Level bombers and Dive bombers. The level bombers ( B5Ns armed with customized battleship shells used as bombs ) scored a fairly impressive 20% hit rate.
 
Last edited:

Louella

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Due to their bad torpedoes the American torpedo bombers had to fly at less then half speed compared to Japanese ones, which made them much easier to dodge. And detonation wasn't the only thing the struggled with, they also frequently went of course, outright sank or were destroyed when hitting the water.

That's why the Americans won at Midway.

The torpedo bombers that attacked the carriers, had to fly low and slow. This drew down the Japanese fighter cover to engage them, and the fighters were then caught low and slow when the dive bombers arrived at height, allowing the dive bombers to set up their attack run with far less interference.
 

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So what we need here IMO is something which can model how different nations had different doctrine & equipment which could allow both dive bombers and torpedo bombers to succeed or fail at sinking ships at sea.

Something I forgot to mention earlier:

The carrier air wing composition is set prior to the game, and cannot be changed (by the AI). It defaults to 50/50 fighter/navbomber composition. This has the result that the only AI countries that ever build carrier CAS are Japan and the USA, and only for the handful of carriers they have that start with CAS wings on board. Any of their new construction of carriers, the air wing will be composed 50/50 fighter/navbomber.

I've asked for this to be changeable by mod, but so far, it has not been considered something worthwhile to code, according to the Paradox devs.

THOUGH, with Man the Guns being naval-orientated, then perhaps there is an opportunity there for something to be done.
 

Alex_brunius

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That's why the Americans won at Midway.

The torpedo bombers that attacked the carriers, had to fly low and slow. This drew down the Japanese fighter cover to engage them, and the fighters were then caught low and slow when the dive bombers arrived at height, allowing the dive bombers to set up their attack run with far less interference.

Not really, that's a myth.

Here is a good book that goes into details as to why, but the basics of it is that a Japanese Zero could climb from sea level to the altitudes where dive bombers flew in 5 minutes, and the torpedo attack happened 25 minutes before the dive bombers hit.

http://www.shatteredswordbook.com/myths.htm
 

Alex_brunius

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Surely the FW200 Condor is a maritime patrol, rather than naval attack bomber ? 4 engines and huge range is a world of difference compared to single-engine torpedo bombers.

And in HoI4 which type of airplane would a Maritime patrol aircraft be? NAV or TAC is what you have to choose from, and only one of them can damage convoys...
 

Secret Master

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Surely the FW200 Condor is a maritime patrol, rather than naval attack bomber ? 4 engines and huge range is a world of difference compared to single-engine torpedo bombers.

Of course, the game doesn't have maritime patrol, so...

Look, if the game had planes with TAC air frames but NAV stats, I'd be all over it. Until then, a plane like the Condor would seem to fit the NAV category better than TAC category. They were certainly better at sinking convoys and ships than TACs are in HOI4.

(And in case anyone is wondering, yes, I'd love to have light, medium, and heavy air frames that can be tailored to specific tasks.)
 

Louella

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NAV or TAC is what you have to choose from, and only one of them can damage convoys...

Oh ? why's that ? do TAC not attack convoys ?

I'd love to have light, medium, and heavy air frames that can be tailored to specific tasks.

One of my aircraft mods, I had maritime patrol aircraft, like, models of the Handley Page Halifax, and Avro Lancaster, that Coastal Command used. They were of NAV type, so they could attack ships at huge ranges.
 

gagenater

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Hate to break up the conversation, but nothing about the designation 'naval bomber' in game suggests that they are only, or primarily torpedo bombers. B-24 liberator strategic bombers were modified for use as naval bombers and saw extensive use in that role, especially in the atlantic. B-17 strategic bombers were used extensively against the Japanese in the Pacific. B25 medium bombers were modified with 75 mm automatic cannons and did a massive # on japanese merchant shipping.