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Old 06-04-2016, 02:05 PM   #111
Polydamas
 
Join Date: Jan 2006
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Default Re: [Basic] Skill of the week: Artillery (and Forward Observer)

Thanks for continuing to provide your real-life expertise! I think that one of the authors of GURPS 3e Guns (title on the cover: High Tech) and some later tech books was an American artilleryman in Vietnam, so I wonder how much of this is American experience in one period, as distorted by several rewritings and editorial interventions, versus Canadian in another.
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Old 06-04-2016, 02:25 PM   #112
roguebfl
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Default Re: [Basic] Skill of the week: Artillery (and Forward Observer)

Quote:
Originally Posted by johndallman View Post
This notation - ₥ - is unfamiliar. I'm guessing it means "mils", probably NATO mils (6400 to a complete circle), but an explanation would help.
https://en.wiktionary.org/wiki/%E2%82%A5 list it as milli- as is 1/10 of centi- ()
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Old 06-04-2016, 03:17 PM   #113
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Default Re: [Basic] Skill of the week: Artillery (and Forward Observer)

Sorry about the unexplained symbol. ₥ is short for mils (which is itself short for milli-radians). There are 2π radians in a circle and, in the military, it's rounded off to 6400₥, (except the Soviets apparently rounded it off to 6300). The old story is "There are 6282₥ in a circle. The Soviets said, 'That's stupid, we'll round it off to 6300₥.' and we said, "The Soviets are stupid. There are four cardinal directions, we'll round it off to 6400₥, so it works out even.'."

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Old 06-04-2016, 03:59 PM   #114
Eukie
 
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Default Re: [Basic] Skill of the week: Artillery (and Forward Observer)

Quote:
Originally Posted by Curmudgeon View Post
Sorry about the unexplained symbol. ₥ is short for mils (which is itself short for milli-radians). There are 2π radians in a circle and, in the military, it's rounded off to 6400₥, (except the Soviets apparently rounded it off to 6300). The old story is "There are 6282₥ in a circle. The Soviets said, 'That's stupid, we'll round it off to 6300₥.' and we said, "The Soviets are stupid. There are four cardinal directions, we'll round it off to 6400₥, so it works out even.'."
That story is very wrong, though; the Russian angular measurement was in 6000ths of a circle, based on an expansion from early Russian mathematicians who divided the circle into equilateral triangles (of which there are six to a circle) and then divided those into tenths, hundreds, and finally thousands. It was Sweden that rounded the circle to 6300 "streck".
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Old 06-06-2016, 05:55 AM   #115
Tomsdad
 
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Default Re: [Basic] Skill of the week: Artillery (and Forward Observer)

Curmudgeon, just want to say cheers for taking the time and effort here

Cheers

TD
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Old 12-30-2017, 04:17 PM   #116
jes722
 
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Default Re: [Basic] Skill of the week: Artillery (and Forward Observer)

We used it when we used W40K for bigger battles! I had FW skill and used to get more precise hits with indirect weapons!
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Old 01-24-2018, 02:12 PM   #117
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Default Re: [Basic] Skill of the week: Artillery (and Forward Observer)

Some part of my brain that was still thinking abut this came up with a house-rule that looks playable, and preserves some 4e RAW:

Gunner, DX/E, is the skill of operating weapons larger than small arms. Attack rolls made with it are DX-based, and either direct fire, or indirect fire observed from the weapon position. It has the existing Gunner specialisations, plus Catapult, Guided Missile and Torpedo.

Artillery, IQ/A, is the skill of calculating weapon paths and trajectories, used for calculating indirect fire, torpedo courses, and the like. Attack rolls made with it are IQ-based, except in unusual circumstances. The ST-based Artillery roll is transferred to Gunner. It has specialisations of Beams, Bombs, Guns, Catapults, Guided Missiles and Torpedoes.

Forward Observer is an optional specialisation of Artillery, and the specialisations of Artillery are familiarities for it.
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