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-   -   A 37mm on a TypeIID?????? (https://www.subsim.com/radioroom/showthread.php?t=127443)

Madox58 12-26-07 04:55 PM

Well,
What if you put a River in a Hockey game?
THAT would get me to buy Pay Per View!!!
:rotfl:

Mush Martin 12-26-07 04:57 PM

I always thought tyson should have been drafted by the Flyers.:doh:

KeptinCranky 12-26-07 04:58 PM

Bwahaahaa! :rotfl:

I want to see that turret going off and that duck doing backflips all the way to the moon :rock:

ROFL

Madox58 12-26-07 04:59 PM

Problem was,
he couldn't walk and chew gum at the same time.
Never mind skates!!!!!

sh3rules 12-26-07 11:13 PM

Quote:

Originally Posted by Mush Martin


:doh::doh::doh::doh::doh:

Captain von Keldunk 12-28-07 05:21 AM

This is what happens if you give a U-boat a new toy.:D:D
Crew has no idea what to do with it ??:rotfl::rotfl::arrgh!::damn:

http://www.pix8.net/pro/pic/22671f80ce/1084713.jpg
But the gun looks so COOL COOOOOL :up::up::up:

KLCARROLL 12-28-07 10:02 AM

Quote:

But the gun looks so COOL COOOOOL
I agree wholeheartedly!!!

Your configuration with a single 37mm on the foredeck, and a 20mm twin on the Wintergarten looks so BELIEVABLE!!! If that setup had been offered in the original game, I don't think that one person out of 100 would have realized it wasn't a real option! (At least not right away!) It just looks RIGHT!

The solid, practical look of this mod raises the interesting question; “In Real Life, why wasn’t it done??”

Being a Mechanical Engineer, my first thought was that there must have been a significant difference in weight, or the amount of stress applied to the hull; .....But neither criteria seems to offer a conclusive “why not”.

A C38 20mm Twin on a pedestal mount weighs approximately 1200 pounds (544kg) and a M42 37mm Single on a pedestal mount weighs approximately 1500 pounds (680kg). Knowing how “German Engineering” tends to be, I can’t believe that a 136kg difference would be a “deal breaker”.

There is a significant difference in recoil between the two rounds, but even this doesn’t offer a clear explanation for not mounting a 37mm.

The 37mm fires a AP projectile that weighs 1.54 pounds (.69kg) with a muzzle velocity of 2674 fps (815 mps)

The 20mm fires an AP projectile that weighs .326 pounds (.148kg) with a muzzle velocity of 2625 fps (800 mps)

As you can see, the velocity of the two rounds is virtually identical, so the difference in recoil impulse is going to come from the weight difference alone. This means that each recoil impulse of the 37mm is going to be 4.6 times larger than impulse created by the 20mm.

But there is more to consider! The C38 20mm twin has a practical rate of fire of 440 rounds per minute, whereas the M42 37mm has a rate of fire of 250 rounds per minute. This means that in terms of kilogram/meters per minute, the 37mm is actually only delivering three times the “thrust” of the 20mm installation. This sort of increase can be addressed by localized bracing and reinforcement.

In the U.S. Military, “Non-standard Field Modifications” are almost a tradition. Was the German doctrine at the time specifically opposed to such things???

klcarroll

looney 12-28-07 10:57 AM

I'm a mechanical engineer also. And I don't think it has anything to with the added weight. More likely it has to do with Airpower. When they used the 2B russian airpower was to strong I think. and for the rest it was a trainer no real front boat

KLCARROLL 12-28-07 11:21 AM

Quote:

Originally Posted by looney
I'm a mechanical engineer also. And I don't think it has anything to with the added weight. More likely it has to do with Airpower. When they used the 2B russian airpower was to strong I think. and for the rest it was a trainer no real front boat

I am sure you're correct: .....From the "Official" point of view.

I'm just puzzled by the fact that no such "Unofficial Field Modification" ever occurred: .......Particularly when you note that several of the Black Sea TypeIIBs were fitted with rocket launchers, which were actually used to cover the German withdrawl from the area!

To me, Rocket Launchers seem much more "far-fetched" than a single 37mm: ....And yet they did that!



@Kpt. Lehmann;

Don't worry! .......I am not even considering asking for Rocket Launchers! :rotfl: :rotfl: :rotfl:

klcarroll

sh3rules 12-28-07 12:20 PM

I'm looking forward to this mod. It must be awesome to have a 37mm available.

panzer 49th 12-28-07 03:27 PM

Quote:

Originally Posted by Mush Martin
What I am not understanding is the difficulty your having with the
configs, everything else is harder by far.


Behold the humble duck that creature most underated and overreacted
to by man.
yes this humble foul is a curious creature for what other bird or beast
in nature operates on land in the air on the sea and under it with globe
circling navigation and the ability to sustain journeys measured in multiple
thousands of miles. A creature so tough it eats rocks
that it hunts out from among the toxic sludge at the bottom of rivers
such stuff as would wipe out the frogs. the duck is curious socially too. unlike almost all
other creatures the duck knows limited protection for while we will put
limits on killing tigers elephants and dolphins for the preservation of species
the ducks limited cull is too sustain the ability to do combat against them
into the future, indeed no we dont go out every autumn with a vast array
of hand portable anti aircraft weapons to shoot red McCaw's no tis only
the humble duck who know's this fate.

may'haps its because deep in the human psyche we find ducks can
be very intimidating :rotfl:

http://i43.photobucket.com/albums/e3...Hunter_004.jpg

I want this for my u-boat it could help me with those dam destroyers:smug:

looney 12-28-07 05:26 PM

Quote:

Originally Posted by KLCARROLL
Quote:

Originally Posted by looney
I'm a mechanical engineer also. And I don't think it has anything to with the added weight. More likely it has to do with Airpower. When they used the 2B russian airpower was to strong I think. and for the rest it was a trainer no real front boat

I am sure you're correct: .....From the "Official" point of view.

I'm just puzzled by the fact that no such "Unofficial Field Modification" ever occurred: .......Particularly when you note that several of the Black Sea TypeIIBs were fitted with rocket launchers, which were actually used to cover the German withdrawl from the area!

To me, Rocket Launchers seem much more "far-fetched" than a single 37mm: ....And yet they did that!



@Kpt. Lehmann;

Don't worry! .......I am not even considering asking for Rocket Launchers! :rotfl: :rotfl: :rotfl:

klcarroll

The rockets look to me that those are in a sense modified "nebelwerfers" the 1st ground to ground missile (Rocket propelled bombs). The russian Stalin organs (katyusha) where their counter part on the Russian front. But the nebelwerfer where far more precise. And where later war mounted on almost evrything that moved, mainly the Halftracks. So it seems kinda logical to mount them also on Subs.

The 37mm AA gun wasn't a good ground attack weapon, even the PAK 37 (anti-tank gun) wasn't that good. It couldn't penetrate any armor after early war and most German infantery Platoons "lost" their piece and used Panzer-schreck and the Panzer-Faust.

In short it makes no sense to put a 37mm slow firing gun on a small unstable platform.

Remember this is a game so shooting down planes is a lot easier ingame :)

Ramcourse 12-28-07 06:25 PM

Quote:

Originally Posted by looney
The rockets look to me that those are in a sense modified "nebelwerfers" the 1st ground to ground missile (Rocket propelled bombs). The russian Stalin organs (katyusha) where their counter part on the Russian front. But the nebelwerfer where far more precise. And where later war mounted on almost evrything that moved, mainly the Halftracks. So it seems kinda logical to mount them also on Subs.

The rockets mounted on the subs were 21cm rockets (also used, indeed, by some Nebelwerfers). They were by no means the first ground-to-ground rockets, those had been popular for a more than a century before, and the Katyusha was developed parallel to the Nebelwerfer, rather than in answer to it. Both the Nebelwerfer and Katyusha were psychologically effective, even though standard artillery was more efficient pound for pound. The whole barrage came down before the infantry could take cover, which instilled them with a sense of helplessness.
Quote:

Originally Posted by looney
The 37mm AA gun wasn't a good ground attack weapon, even the PAK 37 (anti-tank gun) wasn't that good. It couldn't penetrate any armor after early war and most German infantery Platoons "lost" their piece and used Panzer-schreck and the Panzer-Faust.

The 3,7 was adequate in the beginning of the war for harassment, but it was discontinued as obsolete very early on. The gun was not very useful as anti-tank weapon or anti-infantry, but the 3,7 was quite able to put holes in ships. Most important, it was the smallest calibre that could consistently put a plane hors de combat with one hit. Still, first you need to hit anything, and from a rolling duck it would be hard to do.

Quote:

Originally Posted by looney
Remember this is a game so shooting down planes is a lot easier ingame :)

I don't know. Planes were historically very bad shots, and during parts of the war there were an order of magnitude more planes lost to U-boote than the other way around.

sh3rules 12-28-07 08:57 PM

Quote:

Originally Posted by Ramcourse
I don't know. Planes were historically very bad shots, and during parts of the war there were an order of magnitude more planes lost to U-boote than the other way around.

There you go. Therefore, we need this mod! :ping:

KLCARROLL 12-29-07 12:36 AM

@Looney;

Your points are well taken, ....but I think you're misunderstanding what my primary motivation is in searching for this mod.

I enjoy campaigning a TypeIID for two main reasons:

1) It's a handy, quick diving, and quick turning little boat that is really ideally suited to Coastal Work.

2) It's limitations make it a real challenge to rack up "tonnage".

With only five torpedoes on board, you find yourself picking your targets very carefully; .....Which means that you frequently let smaller vessels go by without taking action.

The 20mm guns can be used to deal with the occasional 500 ton trawler or 1000 ton tug, .....but it simply isn't possible to reliably sink 2000 ton small merchants with 20mm fire. (At least not with the stock 20mm values: ....Which is a whole 'nother issue!)

This is where even a very modest deck gun like a single 37mm would make a remarkable difference: ......If you had such a gun mounted, you could realistically expect to sink five or six small merchants per patrol without investing one of your precious torpedoes! That could easily make the difference between a 15,000 ton patrol and a 30,000 ton patrol!

THAT would be my intended use for a 37mm. I rarely engage aircraft, and if I had a 37mm, I don't think I would even include AA ammunition in my load-out.

The research I have done shows that in "real life" the substitution of a single 37mm for the foredeck 20mm twin would be very "do-able". The weights of the guns and mounts are similar, and the "hardpoint" could be easily reinforced to deal with the modest increase in recoil.

If I commanded a TypeIID in real life, and the dockyard refused my request for a 37mm substitution, my crew would be under standing orders to look for every opportunity to steal one!:yep: :yep:

klcarroll


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