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Amendment 2


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#1 Darren Burnside

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Posted 03 June 2011 - 12:16 PM

I may have found and error on those charts

there is no line for one torpedo listed
not sure if it got cropped off , like once happened
with IJN charts or if the new changes are meant to
lower the chance of hits , by deleting that line

Darren

#2 Coastal

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Posted 11 June 2011 - 03:36 PM

I may have found and error on those charts

there is no line for one torpedo listed
not sure if it got cropped off , like once happened
with IJN charts or if the new changes are meant to
lower the chance of hits , by deleting that line

Darren


Actually, thats not an error. Under the rules, torpedoes are launched by mount. And none of the USN and RN ships (including submarines) have a single tube torpedo mount. Consequently, there was no need to have a 1 torpedo line on the chart. (The reason for adding the 1 torpedo line to the IJN chart was to cover some submarines that mounted a single stern tube.)

#3 Darren Burnside

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Posted 12 June 2011 - 09:32 PM

several British subs, like S class second group
listed in Deluxe sheets have single rear tube

#4 Lonnie Gill

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Posted 16 June 2011 - 07:39 PM

G’ Day Darren,

Actually, this was a deliberate decision I made. There is always a tradeoff between trying to provide for every eventuality and keeping the tactical combat charts legible and easy to use.

In updating the TORPEDO CRTs for Amendment 2, I tried to provide for the torpedo mount (torpedo room for subs) combinations used by each navy. Although it was well known by WW II that single torpedo launches provided only marginal probability of success, I included a single torpedo column for the navies that employed it, such as the Kriegsmarine for the Type VII U boat and the RMI for many of its small Spica class TBs. For the USN, the only cases for “modern” vessels were four of the numerous S class submarines from the ‘20s. These four were used for training and did not make war patrols. Thus, a single torpedo column was unnecessary.

The case for the Royal Navy is a little more complex. The only vessels employing a single TT were, as you noted, some of the S class submarines. Many of the “war emergency” third group of the S class subs were built with an external stern tube. The first six of this group with famous names like Safari and P222 were built before the change and it may have been later deleted on some of the others to enable them to ship a 4” gun in place of a 3”. This was more useful for late war gun actions when torpedo targets were scarce. It also appears that 13 of the final 16 were built without the external stern tube, which may be a comment on its utility. In addition, an external tube could only be used once during a patrol before returning to port. My conclusion was that all this - only some of the S class and the limited use external tube - made a British single torpedo attack a rare event that could be left off the RN CRT.

If you want to simulate a mid to late war attack by one of the external tube equipped British S class submarines, you can refer to the Kriegsmarine single torpedo column for hit probabilities. Of course, use the range bands on the RN CRT for distance traveled each Game Turn.

LONNIE




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