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Subject: Conversion of pounds into inches?
Thomas3    6/1/2006 6:40:44 AM
What is the rough and ready conversion of poinds into inches? I'm normally very "metric", but when it comes to guns I've found inches more amendable to my needs. While we are at it: Range is roughly proportional to caliber - all other things equal? Grenade size weight roughly proportinal to cube of caliber? A standard household 155 mm howitzer range is about 15-20 km range? CEP roughly proportional to range? I know of a lot corrections the artillery man has to make, but I'm looking for rules of thumb (like Roman) that provide a guide to discussion among gunners - whom I've learned are normally more than slightly deaf. Secondly the use is for a fast view of a case/claim to see if the proponent is "shelling marines".
 
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Carl S    RE:Conversion of pounds into inches?   6/1/2006 7:46:41 AM
What is the rough and ready conversion of poinds into inches? ----There is none. One is a measurement, the other weight. I must be misunderstanding the question. Range is roughly proportional to caliber - all other things equal? ----No, too many other variables are unequall. Grenade size weight roughly proportinal to cube of caliber? ----There are variables in projectile wall thickness. The steel is the bulk of the proj. weight and this can vary signiifcantly A standard household 155 mm howitzer range is about 15-20 km range? ----No, it varys by era and ammo types. That range zone may have been valid in the 1970s, but in earlier decades & currently the averages would be greater & lesser respectively. CEP roughly proportional to range? ----Only in the roughest way. elevatio, charge increments (varys velocity), cannon model, & others vary this. I know of a lot corrections the artillery man has to make, but I'm looking for rules of thumb (like Roman) that provide a guide to discussion among gunners - whom I've learned are normally more than slightly deaf. ----General rules will vary from one army & era to another. Even Nuetralizer & I have trouble communicating due to differences in language and methods with the British and US artillery. Secondly the use is for a fast view of a case/claim to see if the proponent is "shelling marines". ----I expect I am misunderstanding some of these questions. Feel free to restate them in other words to us.
 
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Thomas3    RE:Conversion of pounds into inches? Carl S   6/1/2006 8:21:39 AM
The britísh use pounds in their caliber, most others use inches. For instance what is the caliber of a 25 pound in inches? range for 6" howitzer: Thanks that give me a starting point. range proportional to caliber: My reasoning was that surface area ~ caliber squared and powder volume ~ caliber cubed, thus powder charge/surface area ~ caliber. But it is as I feared, there are so many variables. But I have to start somewhere! There is a difference between what a skilled craftsman can get away with and what we sparetime-plummers mess up.
 
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AlbanyRifles    RE:Conversion of pounds into inches? Thomas   6/1/2006 9:55:09 AM
There isn't an easy conversion.....I am sure if you Google you could come up wiht a chart I do know that a 2 pdr was 40mm, 6 pdr was 57mm and 17 pdr was 77 mm. Lost beyond that.
 
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The_Mollusc    RE:Conversion of pounds into inches? Thomas   6/1/2006 5:51:53 PM
British/Commonwealth 25-pounder had a 88mm gun tube (but not as long a barrel nor as high velocity as the more famous '88' in service of the Heer).
 
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The_Mollusc    RE:Conversion of pounds into inches? Thomas   6/1/2006 5:56:51 PM
The 17-pounder was a 76mm (but with longer tube and higher velocity than the American 76mm tank gun). The British 77mm gun (as fitted to the Comet tank) was a shortened 17-pounder with smaller breech (and rounds to fit). It was designated 77mm to avoid confusion over what ammo would fit in which gun.
 
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Yimmy    RE:Conversion of pounds into inches? Thomas   6/1/2006 6:00:23 PM
I believe 20 pounders of the Centurion were 84mm. 25 pounders were not 88mm, they were 87.6mm
 
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Yimmy    RE:Conversion of pounds into inches? Thomas   6/1/2006 6:02:02 PM
Don't know why I corrected that... pedantic of me.
 
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Thomas3    Yimmy   6/1/2006 6:07:03 PM
Must be artillery man, a stickler for precision - much appreciated by his comrades.
 
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Yimmy    RE:Yimmy   6/1/2006 6:13:28 PM
Who me? I can't stand the artillery with their bloody bombardiers! I'm infantry!
 
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S-2    RE: Thomas3 Reply   6/1/2006 6:14:55 PM
"Must be artillery man, a stickler for precision" Even artillery is governed by rules of numeric expression. Yimmy, I think, is a logistician. THEIR rules are far more severe!
 
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