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Snippet #13

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Re: Snippet #13
Post by Dilandu   » Tue Nov 13, 2018 6:07 am

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isaac_newton wrote:ah - could you explain the difference for those of us wot are not clued up on these details?


Fast-burning powder apply all the force of the gases to the shell in very short period of time, with no additional presure afterward. So tthe shell is actually accelerated only on the relatively short part of its way through the barrel, and thus long-barreled guns are counterproductive. The pressure would quickly drop, and all remaining lenght of the barrel would provide nothing but friction, slowing shell down.

Slow-burning powder build up pressure more gradualky, so the shell is accelerated MUCH longer. So the gun could be made much longer to accelerate shell to higher velocities.
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Oh well, if shortening the front is what the Germans crave,
Let's shorten it to very end - the length of Fuhrer's grave.

(Red Army lyrics from 1945)
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Re: Snippet #13
Post by Dilandu   » Tue Nov 13, 2018 6:11 am

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lyonheart wrote:Hello and thank you so very much for the data dump, RFC!

Thunderbolt is surprisingly slow for some reason (17.2 vs 28 knots etc), and I'm very surprised how thin the deck armor (1.5-2") still is given how vulnerable it was to the large anti-ship rockets as pointed out in AToT; a new ship class with new more powerful longer ranged guns might now out range those 15" rockets (that were remarkably accurate for early 19th century tech), but from the inner circle discussion during the battle, increasing the KH VII's deck armor was going to be a lesson learned priority in the following ships, let alone even newer classes.




Er, 17,2 Safeholdian knots (15 Earth knots) is her cruising speed. I.e. when her boilers in their optimal, most economical regime.

Her max is 28 Safeholdian knots, i.e. 25 Earth knots.

Basically, she is as fast as last-generation armored cruisers & first-generation battlecruisers in 1900-1910s. Albeit her cruising speed seems a little over the top.
------------------------------

Oh well, if shortening the front is what the Germans crave,
Let's shorten it to very end - the length of Fuhrer's grave.

(Red Army lyrics from 1945)
Top
Re: Snippet #13
Post by isaac_newton   » Tue Nov 13, 2018 7:54 am

isaac_newton
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Dilandu wrote:
isaac_newton wrote:ah - could you explain the difference for those of us wot are not clued up on these details?


Fast-burning powder apply all the force of the gases to the shell in very short period of time, with no additional presure afterward. So tthe shell is actually accelerated only on the relatively short part of its way through the barrel, and thus long-barreled guns are counterproductive. The pressure would quickly drop, and all remaining lenght of the barrel would provide nothing but friction, slowing shell down.

Slow-burning powder build up pressure more gradualky, so the shell is accelerated MUCH longer. So the gun could be made much longer to accelerate shell to higher velocities.



Hi Dilandu - thanks for that

I was also puzzled over the difference between 40 & 45
I thought that 10" was the shell diameter, so what does that extra number mean...

Not the same guns. KH VIIs have 10" 40's and Thunderer has 10" 45's. That argues for slower burning propellant and longer ranges for the 10"ers. Perhaps long enough to take full advantage of what the baloons make possible.
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Re: Snippet #13
Post by Weird Harold   » Tue Nov 13, 2018 8:01 am

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isaac_newton wrote:I was also puzzled over the difference between 40 & 45
I thought that 10" was the shell diameter, so what does that extra number mean...


Image
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.
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Answers! I got lots of answers!

(Now if I could just find the right questions.)
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Re: Snippet #13
Post by Dilandu   » Tue Nov 13, 2018 8:02 am

Dilandu
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isaac_newton wrote:

Hi Dilandu - thanks for that

I was also puzzled over the difference between 40 & 45
I thought that 10" was the shell diameter, so what does that extra number mean...

Not the same guns. KH VIIs have 10" 40's and Thunderer has 10" 45's. That argues for slower burning propellant and longer ranges for the 10"ers. Perhaps long enough to take full advantage of what the baloons make possible.


10-inch is a shell diameter. I.e. the gun caliber.

Now, the 40 and 45 is a barrel lenght in calibres. I.e. the gun lenght in inches, divided on the shell diameter. How many calibres are the gun lenght, to be exact.

The usual system for gun designation is, say, 10-inch/45, which means 10-inch guns, 45 calibres.
------------------------------

Oh well, if shortening the front is what the Germans crave,
Let's shorten it to very end - the length of Fuhrer's grave.

(Red Army lyrics from 1945)
Top
Re: Snippet #13
Post by Dilandu   » Tue Nov 13, 2018 8:03 am

Dilandu
Admiral

Posts: 2541
Joined: Sat May 07, 2011 1:44 pm
Location: Russia

Weird Harold wrote:
isaac_newton wrote:I was also puzzled over the difference between 40 & 45
I thought that 10" was the shell diameter, so what does that extra number mean...


Image


Heh, we posted almost at the same time)
------------------------------

Oh well, if shortening the front is what the Germans crave,
Let's shorten it to very end - the length of Fuhrer's grave.

(Red Army lyrics from 1945)
Top
Re: Snippet #13
Post by Weird Harold   » Tue Nov 13, 2018 8:16 am

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Joined: Thu Apr 24, 2014 10:25 pm
Location: "Lost Wages", NV

Dilandu wrote:Heh, we posted almost at the same time)


I would have beaten you if I hadn't taken three tries to get the URL right. :(
.
.
.
Answers! I got lots of answers!

(Now if I could just find the right questions.)
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Re: Snippet #13
Post by boballab   » Tue Nov 13, 2018 8:49 am

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JBNL1972 wrote:So the Harchong empire is fracturing into regions ... a reverse Chinese unification sort of!

Wizard, thank you for another snippet to fuel the mind with all sorts of speculations!!

This would be more analogous to the break up of the Han Dynasty and the beginning of the Three Kingdoms period https://en.wikipedia.org/wiki/Three_Kingdoms
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"I'd like to think that someone in the Navy somewhere has at least the IQ of a gerbil!" Rear Admiral Rozsak on the officers in the SLN
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Re: Snippet #13
Post by isaac_newton   » Tue Nov 13, 2018 10:02 am

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Weird Harold wrote:
Dilandu wrote:Heh, we posted almost at the same time)


I would have beaten you if I hadn't taken three tries to get the URL right. :(



thanks - all of you :-)

amazing what you can learn here!!
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Re: Snippet #13
Post by PeterZ   » Tue Nov 13, 2018 10:40 am

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I agree with Dilandu that the Jeune Ecole approach will be attractive to Dohlar once they figure out how to propel a torpedo. I suspect their R&D is already playing around with turbines. Recall Charis uses the in their industrial air compressors. It is likely they'll start with compressed air to power torpedoes because of the association with steam turbines.

How difficult hydrogen peroxide is to make without electricity? That would produce a fast torp indeed!
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