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Aerial Torpedos\' Range Bands


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#1 Radoslaw Kabacinski

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Posted 19 March 2007 - 11:50 AM

How were the Aerial Torpedos' Range Bands calculated? Why American torpedos are far greater (only a bit slower) than those used by other nations? 5 Range Bands / 1100y each against 2 RB / 1300 each => 2:1 ratio in available range. I do not get it at all.

#2 Cpt M

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Posted 19 March 2007 - 07:38 PM

The reason is the longer range performance of the US Mark 13 torpedo. The Mark 13 had a range of 6300 yds at a respectable speed of 33.5 knots. Air dropped torpedoes from the other nations were generally faster (high 30s to the low 40s) but had much shorter ranges (3300-3500 yds). So using 5 range bands (at a slower speed) gives a better representation of the Mark 13s characteristics.

#3 Radoslaw Kabacinski

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Posted 20 March 2007 - 04:44 AM

Thank you for the answer. If so, other nations should have 3 range band.The next question is: how the range bands from AO part correspond with those on the navy’s TORPEDO CRT? At least in some of them, one column is for 'aerial' torpedos.

#4 Lonnie Gill

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Posted 20 March 2007 - 09:36 PM

Rademon,As Coastal has described, the USN took a different tack with the Mk13 aerial torpedo with a range of 6,300 yds @ 33 kts while most other navies employed smaller [generally 18"] aerial torpedoes which were faster, generally 40 to 45 kts, but had shorter endurance, usually in the 2 - 3,000 yd range. Their expectation was that effective torpedo drops would need to be close to targets and higher speeds would reduce the evasive action a target could take. The details for a number of torpedoes are provided in the Bonus files under Design Files. Full detail is available at www.navweaps.com, which is a goldmine for naval weapons data.These aerial torpedo characteristics were simplified in Section 2.11.2 on page 2-12 into 2 Air Phase range bands of 1,300 yds (average 0f 2600 yds) for all but the USN which has 5 Air Phase range bands of 1,100 yds to reflect the Mk 13's radically different speed and range characteristics. Note that these are Air Phase range bands and three of them would occur in one Game Turn. [The USN Mk 13 would be the only one running into a second Game Turn.]The Torpedo CRT range scales, on the left or right of the table, indicate which is used for aerial torpedoes for each navy. These ranges are for Game Turns (e.g., three Air Phases) rather than the one minute Air Phases as described in Section 2.11.2. I used an alternate for the RNN Supplement which had a separate range column for aerial torpedoes to distinguish them from surface launched 18" or 21" torpedoes. If responses indicate this is clearer, I'll amend the standard GQ III CRTs to show this further distinction. These revisions would be loaded into the Down Load files for your use. I will wait a while longer before making these changes to assess the response from the RNN.Finally, while the Air Phase range bands in Section 2.11.2 are used as part of the determination of target interception in a particular Air Phase, the range from launch point [the post-it] to the target is used to determine which row to use on the TORPEDO CRT. For example, a British 18" aerial torpedo could intercept a target in either Air Phase 1 or Air Phase 2, but both would use the 2,700 yd range band on the Royal Navy TORPEDO CRT as the distance moved in both Air Phases (1,300 yds x 2) is within the 2,700 yd range band.LONNIE

#5 Radoslaw Kabacinski

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Posted 21 March 2007 - 03:15 AM

Thank you for the answer.Why we do not use the range bands from TORPEDO CRT divided by 3 (for each Air Phase) for the aerial torpedos used by non-USN navies?

#6 Lonnie Gill

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Posted 22 March 2007 - 09:49 PM

The rule provided a general, average run for aerial torpedoes. Listing the aerial torpedo range separately on each navy's TORPEDO CRT, as shown on the RNN chart, will enable you to do just as you suggest. Simply divide the Game Turn range shown on the range scale into three Air Phase range bands.LONNIE




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