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MASSIVE SPOILER about next book hardware

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Re: MASSIVE SPOILER about next book hardware
Post by Dutch46   » Wed Apr 04, 2012 9:31 pm

Dutch46
Captain (Junior Grade)

Posts: 348
Joined: Sat Mar 03, 2012 9:01 pm

Silverwall wrote:I sincerely doubt that this vessel will ever get even close to it's theoretical Max speed of 18 (safehold) knots.

Using the displacement hull speed equation v_{hull} \approx 1.34 \times \sqrt{LWL} (from wikipedia) we find that the value by RFC is effetivly the max hull speed for the length of the ship.

While this is all fine and dandy so far we now have to deal with some nasty real world issues. First power requirements increase exponentially as you approach hull speed limits. Even with help from Merlin you cannot get that sort of performance from a piston powered steam engine. You can only get close with a steam trubine that is way beyond the tech required.

Secondly the low freeboard has a terrible effect on speed as in any sort of seaway other than dead calm the ship ends up driving it's nose under the breaking waves and sapping off a huge amount of power. Just compare the Royal Soverign class 410 feet,19 feet 6 inches freeboard and a speed of 17.5 knots with the contemporary Hood which had the same hull design and machinery but with a lower freeboard. 11 feet 3 inches and a consequent top speed of about 15.5 knots. The Royal navy was not happy and never again built low freeboard battleships because of the poor performance in rough seas.

To give you an idea of what is plausable with the technology of the time the hull speed for 410 feet is 27 knots. This suggests that even assuming that the Howmsmyn machinery is as effecient as that on the Royal Sovereign (it almost certainly isn't) proportionality suggests that we could expect the proposed gunboat to have an effective top speed of between 8-12 safehold Knots which is still highly respectable for a ship of her size. (Yes I know these things don't scale linearly but it's a good first order approximation.)

To compare to a modern ship we can take the Cornelia Marie from the dealiest catch, she is 128 feet (39 m) long, 28 feet (8.5 m) wide and with twin Mitsubishi engines generate 630 horsepower for a top speed of around 10 (Earth) knots.


Even with the undoubtedly accurate restrictions you placed on the vessel It should still outperform any ship that's under sail by a fair margin. I would be interested in some guesses as to the internal arrangements of the power plant and its auxilliaries. Also, does it have any bells and whistles such as a transmission so you do not have to bring the engines to a dead stop when you want reverse? It's a massive jump from experiments with steam to watertube boilers so I wonder what other shortcuts RFC might have introduced as long as he was at it.
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Re: MASSIVE SPOILER about next book hardware
Post by Hallofaman   » Wed Apr 04, 2012 11:22 pm

Hallofaman
Lieutenant (Senior Grade)

Posts: 77
Joined: Sat Aug 20, 2011 9:22 pm

When i was around 11 i was verry interested in war histroy, and i remember reading that in the spanish american war, a few number of american ironclads smashed a huge number of spanish wooden gallons.... (my memory may be a little foggy :)

now look at that huge down-load RFC just gave us when he was ansering a few questions on this verry forum....

WHAT DID HE SAY ABOUT THE GULF OF DOHLAR? he talked about how the kingdom of dohlar tried to dominate its trade but he also hinted that the ocean going vessals of the EoC was not really necsary for local trade there....

for that matter where not their galleys the smallest of them all....
AND kingdom of Dohlar has the only navey left at this point... ( and maybe the southern Harchong empire, but we don't need to worry about them)

Just what i think might happen....
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Re: MASSIVE SPOILER about next book hardware
Post by runsforcelery   » Thu Apr 05, 2012 1:21 am

runsforcelery
First Space Lord

Posts: 2425
Joined: Sun Aug 09, 2009 11:39 am
Location: South Carolina

Hallofaman wrote:When i was around 11 i was verry interested in war histroy, and i remember reading that in the spanish american war, a few number of american ironclads smashed a huge number of spanish wooden gallons.... (my memory may be a little foggy :)

now look at that huge down-load RFC just gave us when he was ansering a few questions on this verry forum....

WHAT DID HE SAY ABOUT THE GULF OF DOHLAR? he talked about how the kingdom of dohlar tried to dominate its trade but he also hinted that the ocean going vessals of the EoC was not really necsary for local trade there....

for that matter where not their galleys the smallest of them all....
AND kingdom of Dohlar has the only navey left at this point... ( and maybe the southern Harchong empire, but we don't need to worry about them)

Just what i think might happen....


I'm afraid your memory is a little foggy. [G]

There were some wooden hulled cruisers in the Spanish fleet, but they were steam powered vessels with breechloading artillery. They certainly weren't galleons, which had disappeared as a type by, oh, 1700 or so.


"Oh, bother!" said Pooh, as Piglet came back from the dead.
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Re: MASSIVE SPOILER about next book hardware
Post by lyonheart   » Thu Apr 05, 2012 2:51 am

lyonheart
Fleet Admiral

Posts: 4853
Joined: Tue Sep 08, 2009 11:27 pm

Hi Hallofaman,

The Spanish navy in the Spanish-American war was older and generally more obsolete than the American in an era of constant changing technology, but not in all cases and it was hardly wooden galleon types of the Spanish armada period.

Your implication RFC intends to replicate the battle of Santiago seems unlikely to me because the ironclad doesn't fit, being technically obsolete in several ways, NTM the gulf of Dohlar doesn't replicate the Caribbean, especially Santiago bay.

But certain aspects might seem similar simply because the 19th century navies saw so many dramatic changes in the last fifty years.

I suspect an ocean going ironclad capable of sustained 9.5 mph will be able to run down almost any ship it meets and destroy it.

It may be the wooden Dohlar navy may attempt to run from Gorath Bay when the Charisian-Siddarmark alliance army has made it unsafe; running a gauntlet of the ironclads if they are ready as quickly as some think, before attempting to out-sail the wooden near-frigates of the ICN, with similar results to the Spanish Navy's.

But RFC is usually much more inventive than that.

L


Hallofaman wrote:When i was around 11 i was verry interested in war histroy, and i remember reading that in the spanish american war, a few number of american ironclads smashed a huge number of spanish wooden gallons.... (my memory may be a little foggy :)

now look at that huge down-load RFC just gave us when he was ansering a few questions on this verry forum....

WHAT DID HE SAY ABOUT THE GULF OF DOHLAR? he talked about how the kingdom of dohlar tried to dominate its trade but he also hinted that the ocean going vessals of the EoC was not really necsary for local trade there....

for that matter where not their galleys the smallest of them all....
AND kingdom of Dohlar has the only navey left at this point... ( and maybe the southern Harchong empire, but we don't need to worry about them)

Just what i think might happen....
Any snippet or post from RFC is good if not great!
Top
Re: MASSIVE SPOILER about next book hardware
Post by runsforcelery   » Thu Apr 05, 2012 3:21 am

runsforcelery
First Space Lord

Posts: 2425
Joined: Sun Aug 09, 2009 11:39 am
Location: South Carolina

Silverwall wrote:I sincerely doubt that this vessel will ever get even close to it's theoretical Max speed of 18 (safehold) knots.

Using the displacement hull speed equation v_{hull} \approx 1.34 \times \sqrt{LWL} (from wikipedia) we find that the value by RFC is effetivly the max hull speed for the length of the ship.

While this is all fine and dandy so far we now have to deal with some nasty real world issues. First power requirements increase exponentially as you approach hull speed limits. Even with help from Merlin you cannot get that sort of performance from a piston powered steam engine. You can only get close with a steam trubine that is way beyond the tech required.

Secondly the low freeboard has a terrible effect on speed as in any sort of seaway other than dead calm the ship ends up driving it's nose under the breaking waves and sapping off a huge amount of power. Just compare the Royal Soverign class 410 feet,19 feet 6 inches freeboard and a speed of 17.5 knots with the contemporary Hood which had the same hull design and machinery but with a lower freeboard. 11 feet 3 inches and a consequent top speed of about 15.5 knots. The Royal navy was not happy and never again built low freeboard battleships because of the poor performance in rough seas.

To give you an idea of what is plausable with the technology of the time the hull speed for 410 feet is 27 knots. This suggests that even assuming that the Howmsmyn machinery is as effecient as that on the Royal Sovereign (it almost certainly isn't) proportionality suggests that we could expect the proposed gunboat to have an effective top speed of between 8-12 safehold Knots which is still highly respectable for a ship of her size. (Yes I know these things don't scale linearly but it's a good first order approximation.)

To compare to a modern ship we can take the Cornelia Marie from the dealiest catch, she is 128 feet (39 m) long, 28 feet (8.5 m) wide and with twin Mitsubishi engines generate 630 horsepower for a top speed of around 10 (Earth) knots.


In fact, their machinery is superior in design to that of the Royal Sovereign of 1891 (which I assume is the ship you're citing here), and their screw design is markedly superior (having been modeled courtesy of Owl), allowing them to transmit power much more effectively to the water. Having said that, the comparative power output of these ships is going to be lower than the advantages of small tube boilers and higher steam pressures might seem to imply, since the RS had three-cylinder engines and they have only two-cylinder engines. Power output will, however, be substantially superior to that of the Cornelia Marie's diesels, albeit at a far greater penalty in weight.

In calm waters, they certainly would make the speeds I gave; off soundings, things will be quite different. As you rightly point out, they will tend to drive into and through seas rather than riding over them, which will hugely increase drag and lower speed. I'm estimating a sustained sea speed of 12 Safeholdian knots/mph (just under 10.5 knots by our measure) up to about a sea state of Force 6 on the Beaufort Scale, dropping steadily after that. Up to about Force 3 or even Force 4, they ought to come pretty close to their listed maximum speed. Note that when I say "up to about" Force 6, I mean to imply stopping at Force 6 (10-ft wave height) as a maximum. By the time you get above 10' wave heights, they are going to be forced to reduce speed fairly drastically.

One thing to bear in mind is that these ships have almost twice the power they actually need. There are reasons for this (given in the book), but basically they duplicated the power plant (and number of screws) which gave the barges a speed of about 12 knots in river/canal conditions when they decided to convert them into warships. As such, even with their twin-cylinder engines, their power-to-weight ratio is higher than that of the RS, although the RS's much better blue-water hull form would go a long way to equalize that because it can be driven more efficiently.


"Oh, bother!" said Pooh, as Piglet came back from the dead.
Top
Re: MASSIVE SPOILER about next book hardware
Post by PeterZ   » Thu Apr 05, 2012 9:55 am

PeterZ
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Posts: 6432
Joined: Fri Apr 01, 2011 1:11 pm
Location: Colorado

Lyonheart, Hallofaman;

RFC couldn't resist and had to provide clues for you. His post revisited their river/canal roots. His prior posts have emphasized the centrality of Siddermark. All in all I think Lyonheart may have nailed it earlier when he guessed that the casement ironclads would be used in the Siddermarkian interior where all that extra horse power he designed into them can tow freight in addition to its guns and armour.

One or two may cruise the Gulf of Dohlar or the coast of Howard looking for those river schooner yards. The majority would find more profitable use in Siddermark.

As I see it, the CoGA allies MUST keept he canals open or they cannot supply their armies. The defenses the church forces will erect will be directed at land forces. As they see it anything on the canal itself will need to be pulled by draft animals. The best defense against the ironclads is to destroy the canals. The church forces can't do that without destroying their abiltiy to propgress deeper into Siddermark.

So, the ironclads blow throught the CoGA lines at the canal then canister/grape shot the church forces from behind their lines. The Corisandian cavalry charges in and shatters the remaining formation to a fare-thee-well.

If they have already progressed deep enough into Siddermark that overland dragon freight can manage to supply the army from the end of the canal, that simply means they have a long supply line behind them that can be cut. I suspect that the main Church force would have to be defeated in a decisive battle. If they are defeated slowly over a longer period, they can thoroughly screw over the canals in their retreat. That would been a delay of any follow through into the Temple Lands by perhaps years.

Between the towing capacity of the ironclads, their firepower and their shallow daft, I truly can't see a more profitable use for them. I may be wrong. If so, anyone feel free to enlighten this poor tactician/strategist.

lyonheart wrote:Hi Hallofaman,

The Spanish navy in the Spanish-American war was older and generally more obsolete than the American in an era of constant changing technology, but not in all cases and it was hardly wooden galleon types of the Spanish armada period.

Your implication RFC intends to replicate the battle of Santiago seems unlikely to me because the ironclad doesn't fit, being technically obsolete in several ways, NTM the gulf of Dohlar doesn't replicate the Caribbean, especially Santiago bay.

But certain aspects might seem similar simply because the 19th century navies saw so many dramatic changes in the last fifty years.

I suspect an ocean going ironclad capable of sustained 9.5 mph will be able to run down almost any ship it meets and destroy it.

It may be the wooden Dohlar navy may attempt to run from Gorath Bay when the Charisian-Siddarmark alliance army has made it unsafe; running a gauntlet of the ironclads if they are ready as quickly as some think, before attempting to out-sail the wooden near-frigates of the ICN, with similar results to the Spanish Navy's.

But RFC is usually much more inventive than that.

L


Hallofaman wrote:When i was around 11 i was verry interested in war histroy, and i remember reading that in the spanish american war, a few number of american ironclads smashed a huge number of spanish wooden gallons.... (my memory may be a little foggy :)

now look at that huge down-load RFC just gave us when he was ansering a few questions on this verry forum....

WHAT DID HE SAY ABOUT THE GULF OF DOHLAR? he talked about how the kingdom of dohlar tried to dominate its trade but he also hinted that the ocean going vessals of the EoC was not really necsary for local trade there....

for that matter where not their galleys the smallest of them all....
AND kingdom of Dohlar has the only navey left at this point... ( and maybe the southern Harchong empire, but we don't need to worry about them)

Just what i think might happen....


runsforcelery wrote:In fact, their machinery is superior in design to that of the Royal Sovereign of 1891 (which I assume is the ship you're citing here), and their screw design is markedly superior (having been modeled courtesy of Owl), allowing them to transmit power much more effectively to the water. Having said that, the comparative power output of these ships is going to be lower than the advantages of small tube boilers and higher steam pressures might seem to imply, since the RS had three-cylinder engines and they have only two-cylinder engines. Power output will, however, be substantially superior to that of the Cornelia Marie's diesels, albeit at a far greater penalty in weight.

In calm waters, they certainly would make the speeds I gave; off soundings, things will be quite different. As you rightly point out, they will tend to drive into and through seas rather than riding over them, which will hugely increase drag and lower speed. I'm estimating a sustained sea speed of 12 Safeholdian knots/mph (just under 10.5 knots by our measure) up to about a sea state of Force 6 on the Beaufort Scale, dropping steadily after that. Up to about Force 3 or even Force 4, they ought to come pretty close to their listed maximum speed. Note that when I say "up to about" Force 6, I mean to imply stopping at Force 6 (10-ft wave height) as a maximum. By the time you get above 10' wave heights, they are going to be forced to reduce speed fairly drastically.

One thing to bear in mind is that these ships have almost twice the power they actually need. There are reasons for this (given in the book), but basically they duplicated the power plant (and number of screws) which gave the barges a speed of about 12 knots in river/canal conditions when they decided to convert them into warships. As such, even with their twin-cylinder engines, their power-to-weight ratio is higher than that of the RS, although the RS's much better blue-water hull form would go a long way to equalize that because it can be driven more efficiently.
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Re: MASSIVE SPOILER about next book hardware
Post by lyonheart   » Thu Apr 05, 2012 4:11 pm

lyonheart
Fleet Admiral

Posts: 4853
Joined: Tue Sep 08, 2009 11:27 pm

Hi PeterZ,

I think you may be giving me too much credit, but the extra power for barge pulling seems right on the mark!

Kudos for being very clever or insightful! :-)

If the ironclad guns have ranges of at least 2 miles (2.5-3?), it's likely most of the supplies the CoGA armies are depending upon will be in range of them from the canals, so it becomes a matter of ammunition supply versus target quality.

I suspect they may not arrive until summer, but their effect on animal transport via the steam whistle if it is especially set (thanks to OWL) for irritating dragons and horses, could stampede what isn't killed by shells, considerably delaying any movement by the CoGA armies to say the least.

While the ironclad will have marines, getting around barges in front of it or sunk to delay its advance will require some time or very wide canals.

It will be interesting to see if either Clyntahn or Maigwair expect to live off the land in the buffer states to speed up their advance, and whether the republic will do the same in its turn a year or so later.

The combination of the ironclads and OWL's arsenal ought to go a long way in delaying the temple armies.

If the temple guard armies burn or attempt to destroy the buffer state crops during their retreat, the buffer states might welcome the Siddarmarkians just to stop it before they starve, or are forced to head south, abandoning their lands and homes of centuries, if not join the anti-Go4 alliance.

A major problem for the rapidity of Siddarmark's pursuit will be horses and dragons unless many if not most are captured from the CoGA armies, but the ironclads can help limit the number towing canal barges.

Hopefully there will be many steam engines sent to be installed in canal barges to be tugs to provide the power for two way traffic back to the ports, not just at the front.

L


PeterZ wrote:Lyonheart, Hallofaman;

RFC couldn't resist and had to provide clues for you. His post revisited their river/canal roots. His prior posts have emphasized the centrality of Siddermark. All in all I think Lyonheart may have nailed it earlier when he guessed that the casement ironclads would be used in the Siddermarkian interior where all that extra horse power he designed into them can tow freight in addition to its guns and armour.

One or two may cruise the Gulf of Dohlar or the coast of Howard looking for those river schooner yards. The majority would find more profitable use in Siddermark.

As I see it, the CoGA allies MUST keept he canals open or they cannot supply their armies. The defenses the church forces will erect will be directed at land forces. As they see it anything on the canal itself will need to be pulled by draft animals. The best defense against the ironclads is to destroy the canals. The church forces can't do that without destroying their abiltiy to propgress deeper into Siddermark.

So, the ironclads blow throught the CoGA lines at the canal then canister/grape shot the church forces from behind their lines. The Corisandian cavalry charges in and shatters the remaining formation to a fare-thee-well.

If they have already progressed deep enough into Siddermark that overland dragon freight can manage to supply the army from the end of the canal, that simply means they have a long supply line behind them that can be cut. I suspect that the main Church force would have to be defeated in a decisive battle. If they are defeated slowly over a longer period, they can thoroughly screw over the canals in their retreat. That would been a delay of any follow through into the Temple Lands by perhaps years.

Between the towing capacity of the ironclads, their firepower and their shallow daft, I truly can't see a more profitable use for them. I may be wrong. If so, anyone feel free to enlighten this poor tactician/strategist.

lyonheart wrote:Hi Hallofaman,

The Spanish navy in the Spanish-American war was older and generally more obsolete than the American in an era of constant changing technology, but not in all cases and it was hardly wooden galleon types of the Spanish armada period.

Your implication RFC intends to replicate the battle of Santiago seems unlikely to me because the ironclad doesn't fit, being technically obsolete in several ways, NTM the gulf of Dohlar doesn't replicate the Caribbean, especially Santiago bay.

But certain aspects might seem similar simply because the 19th century navies saw so many dramatic changes in the last fifty years.

I suspect an ocean going ironclad capable of sustained 9.5 mph will be able to run down almost any ship it meets and destroy it.

It may be the wooden Dohlar navy may attempt to run from Gorath Bay when the Charisian-Siddarmark alliance army has made it unsafe; running a gauntlet of the ironclads if they are ready as quickly as some think, before attempting to out-sail the wooden near-frigates of the ICN, with similar results to the Spanish Navy's.

But RFC is usually much more inventive than that.

L


Hallofaman wrote:When i was around 11 i was verry interested in war histroy, and i remember reading that in the spanish american war, a few number of american ironclads smashed a huge number of spanish wooden gallons.... (my memory may be a little foggy :)

now look at that huge down-load RFC just gave us when he was ansering a few questions on this verry forum....

WHAT DID HE SAY ABOUT THE GULF OF DOHLAR? he talked about how the kingdom of dohlar tried to dominate its trade but he also hinted that the ocean going vessals of the EoC was not really necsary for local trade there....

for that matter where not their galleys the smallest of them all....
AND kingdom of Dohlar has the only navey left at this point... ( and maybe the southern Harchong empire, but we don't need to worry about them)

Just what i think might happen....


runsforcelery wrote:In fact, their machinery is superior in design to that of the Royal Sovereign of 1891 (which I assume is the ship you're citing here), and their screw design is markedly superior (having been modeled courtesy of Owl), allowing them to transmit power much more effectively to the water. Having said that, the comparative power output of these ships is going to be lower than the advantages of small tube boilers and higher steam pressures might seem to imply, since the RS had three-cylinder engines and they have only two-cylinder engines. Power output will, however, be substantially superior to that of the Cornelia Marie's diesels, albeit at a far greater penalty in weight.

In calm waters, they certainly would make the speeds I gave; off soundings, things will be quite different. As you rightly point out, they will tend to drive into and through seas rather than riding over them, which will hugely increase drag and lower speed. I'm estimating a sustained sea speed of 12 Safeholdian knots/mph (just under 10.5 knots by our measure) up to about a sea state of Force 6 on the Beaufort Scale, dropping steadily after that. Up to about Force 3 or even Force 4, they ought to come pretty close to their listed maximum speed. Note that when I say "up to about" Force 6, I mean to imply stopping at Force 6 (10-ft wave height) as a maximum. By the time you get above 10' wave heights, they are going to be forced to reduce speed fairly drastically.

One thing to bear in mind is that these ships have almost twice the power they actually need. There are reasons for this (given in the book), but basically they duplicated the power plant (and number of screws) which gave the barges a speed of about 12 knots in river/canal conditions when they decided to convert them into warships. As such, even with their twin-cylinder engines, their power-to-weight ratio is higher than that of the RS, although the RS's much better blue-water hull form would go a long way to equalize that because it can be driven more efficiently.
Any snippet or post from RFC is good if not great!
Top
Re: MASSIVE SPOILER about next book hardware
Post by runsforcelery   » Thu Apr 05, 2012 5:57 pm

runsforcelery
First Space Lord

Posts: 2425
Joined: Sun Aug 09, 2009 11:39 am
Location: South Carolina

PeterZ wrote:Lyonheart, Hallofaman;

RFC couldn't resist and had to provide clues for you. His post revisited their river/canal roots. His prior posts have emphasized the centrality of Siddermark. All in all I think Lyonheart may have nailed it earlier when he guessed that the casement ironclads would be used in the Siddermarkian interior where all that extra horse power he designed into them can tow freight in addition to its guns and armour.

One or two may cruise the Gulf of Dohlar or the coast of Howard looking for those river schooner yards. The majority would find more profitable use in Siddermark.

As I see it, the CoGA allies MUST keept he canals open or they cannot supply their armies. The defenses the church forces will erect will be directed at land forces. As they see it anything on the canal itself will need to be pulled by draft animals. The best defense against the ironclads is to destroy the canals. The church forces can't do that without destroying their abiltiy to propgress deeper into Siddermark.

So, the ironclads blow throught the CoGA lines at the canal then canister/grape shot the church forces from behind their lines. The Corisandian cavalry charges in and shatters the remaining formation to a fare-thee-well.

If they have already progressed deep enough into Siddermark that overland dragon freight can manage to supply the army from the end of the canal, that simply means they have a long supply line behind them that can be cut. I suspect that the main Church force would have to be defeated in a decisive battle. If they are defeated slowly over a longer period, they can thoroughly screw over the canals in their retreat. That would been a delay of any follow through into the Temple Lands by perhaps years.

Between the towing capacity of the ironclads, their firepower and their shallow daft, I truly can't see a more profitable use for them. I may be wrong. If so, anyone feel free to enlighten this poor tactician/strategist.

lyonheart wrote:Hi Hallofaman,

The Spanish navy in the Spanish-American war was older and generally more obsolete than the American in an era of constant changing technology, but not in all cases and it was hardly wooden galleon types of the Spanish armada period.

Your implication RFC intends to replicate the battle of Santiago seems unlikely to me because the ironclad doesn't fit, being technically obsolete in several ways, NTM the gulf of Dohlar doesn't replicate the Caribbean, especially Santiago bay.

But certain aspects might seem similar simply because the 19th century navies saw so many dramatic changes in the last fifty years.

I suspect an ocean going ironclad capable of sustained 9.5 mph will be able to run down almost any ship it meets and destroy it.

It may be the wooden Dohlar navy may attempt to run from Gorath Bay when the Charisian-Siddarmark alliance army has made it unsafe; running a gauntlet of the ironclads if they are ready as quickly as some think, before attempting to out-sail the wooden near-frigates of the ICN, with similar results to the Spanish Navy's.

But RFC is usually much more inventive than that.

L


Hallofaman wrote:When i was around 11 i was verry interested in war histroy, and i remember reading that in the spanish american war, a few number of american ironclads smashed a huge number of spanish wooden gallons.... (my memory may be a little foggy :)

now look at that huge down-load RFC just gave us when he was ansering a few questions on this verry forum....

WHAT DID HE SAY ABOUT THE GULF OF DOHLAR? he talked about how the kingdom of dohlar tried to dominate its trade but he also hinted that the ocean going vessals of the EoC was not really necsary for local trade there....

for that matter where not their galleys the smallest of them all....
AND kingdom of Dohlar has the only navey left at this point... ( and maybe the southern Harchong empire, but we don't need to worry about them)

Just what i think might happen....


runsforcelery wrote:In fact, their machinery is superior in design to that of the Royal Sovereign of 1891 (which I assume is the ship you're citing here), and their screw design is markedly superior (having been modeled courtesy of Owl), allowing them to transmit power much more effectively to the water. Having said that, the comparative power output of these ships is going to be lower than the advantages of small tube boilers and higher steam pressures might seem to imply, since the RS had three-cylinder engines and they have only two-cylinder engines. Power output will, however, be substantially superior to that of the Cornelia Marie's diesels, albeit at a far greater penalty in weight.

In calm waters, they certainly would make the speeds I gave; off soundings, things will be quite different. As you rightly point out, they will tend to drive into and through seas rather than riding over them, which will hugely increase drag and lower speed. I'm estimating a sustained sea speed of 12 Safeholdian knots/mph (just under 10.5 knots by our measure) up to about a sea state of Force 6 on the Beaufort Scale, dropping steadily after that. Up to about Force 3 or even Force 4, they ought to come pretty close to their listed maximum speed. Note that when I say "up to about" Force 6, I mean to imply stopping at Force 6 (10-ft wave height) as a maximum. By the time you get above 10' wave heights, they are going to be forced to reduce speed fairly drastically.

One thing to bear in mind is that these ships have almost twice the power they actually need. There are reasons for this (given in the book), but basically they duplicated the power plant (and number of screws) which gave the barges a speed of about 12 knots in river/canal conditions when they decided to convert them into warships. As such, even with their twin-cylinder engines, their power-to-weight ratio is higher than that of the RS, although the RS's much better blue-water hull form would go a long way to equalize that because it can be driven more efficiently.



I would simply point out that the reason their powerplants were doubled had absolutely nothing to do with towing power or the need to provide additional power at all. Hint: think redundancy here, then think 5,000-mile-plus voyage across blue water by a vessel not rigged for sail at speeds no escorting galleon could equal.

Just saying.


"Oh, bother!" said Pooh, as Piglet came back from the dead.
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Re: MASSIVE SPOILER about next book hardware
Post by kbus888   » Thu Apr 05, 2012 6:22 pm

kbus888
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Posts: 1980
Joined: Mon May 02, 2011 11:58 pm
Location: Eastern Canada

Thanks <RFC> for the clarification.

Of course the fact that if the ships arrive at their final destination with both power plants still in working order means that in that case the ships are indeed powered to twice the necessary levels is just a fortunate happenstance, right ??

Sure it is !!!

Also just say'n [wink]

R

runsforcelery wrote:
<snip>

I would simply point out that the reason their powerplants were doubled had absolutely nothing to do with towing power or the need to provide additional power at all. Hint: think redundancy here, then think 5,000-mile-plus voyage across blue water by a vessel not rigged for sail at speeds no escorting galleon could equal.

Just saying.
..//* *\\
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Re: MASSIVE SPOILER about next book hardware
Post by PeterZ   » Thu Apr 05, 2012 6:33 pm

PeterZ
Fleet Admiral

Posts: 6432
Joined: Fri Apr 01, 2011 1:11 pm
Location: Colorado

I got that from your initial post, redundancy, I mean. Its just that you write such imaginative stories that such plain vanilla bits of speculation seems unworthy. So even though redundancy was why it was designed the way it was, I have to add some color and what little je ne sais quoi that I might possess.

runsforcelery wrote:
I would simply point out that the reason their powerplants were doubled had absolutely nothing to do with towing power or the need to provide additional power at all. Hint: think redundancy here, then think 5,000-mile-plus voyage across blue water by a vessel not rigged for sail at speeds no escorting galleon could equal.

Just saying.
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