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Old 04-25-2006, 02:25 AM   #1
Luther
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Default Explosives: Lethality of 1 pount of TNT

Have you any reference about the lethality radius of 1 pound of TNT?

One pound of TNT does 6dx2 in GURPS, which averages 42 HPs in the center hex, 14 HPs at one meter range, 4 HPs at 2 meters, and so on. The concussion damage from such explosive have a lethality radius of one yard. This seems low to me, but I'm no expert.

I'm looking for some real world figure to use as benchmark. It doesn't need to be 1 pound, or 1 kilogram, or even TNT. I just need some accurate data about the killing and or incapacitating power of explosives (just concussion damage).

This page (and the site) has some useful information. However I would avoid specific weapons, because they are not yet fully statted in 4e and it would be better to benchmark the raw explosives.
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Last edited by Luther; 04-25-2006 at 04:34 AM.
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Old 04-25-2006, 03:44 AM   #2
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Default Re: Explosives: Lethality of 1 pount of TNT

Remember to add in fragmentation and shrapnel damage. Most explosives have some kind of packaging, and exploding cars should give a ready supply of flying metal chunks with sharp edges.
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Old 04-25-2006, 03:56 AM   #3
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Default Re: Explosives: Lethality of 1 pount of TNT

Quote:
Originally Posted by zorg
Remember to add in fragmentation and shrapnel damage.
Please no, this thread is only about concussion damage. Just the damage from the blast. That's why I prefer to benchmark raw explosives, rather than weapons, less confusion.
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Old 04-25-2006, 04:15 AM   #4
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Default Re: Explosives: Lethality of 1 pount of TNT

Quote:
Originally Posted by Luther
Have you any reference about the lethality radius of 1 pound of TNT?

On pound of TNT does 6dx2 in GURPS, which averages 42 HPs in the center hex, 14 HPs at one meter range, 4 HPs at 2 meters, and so on. The concussion damage from such explosive have a lethality radius of one yard. This seems low to me, but I'm no expert.

I'm looking for some real world figure to use as benchmark. It doesn't need to be 1 pound, or 1 kilogram, or even TNT. I just need some accurate data about the killing and or incapacitating power of explosives (just concussion damage).

This page (and the site) has some useful information. However I would avoid specific weapons, because they are not yet fully statted in 4e and it would be better to benchmark the raw explosives.
p415 said blast is 6d x sqrt(lbs) x 4 x relative exp. force.

So 1lb of TNT do 6dx4. or?
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Old 04-25-2006, 04:33 AM   #5
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Default Re: Explosives: Lethality of 1 pount of TNT

Quote:
Originally Posted by kure
p415 said blast is 6d x sqrt(lbs) x 4 x relative exp. force.

So 1lb of TNT do 6dx4. or?
Nope, it is 6d x sqrt(lbs x 4 x REF)

Note parenthesis.
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Old 04-25-2006, 05:34 AM   #6
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Default Re: Explosives: Lethality of 1 pount of TNT

Quote:
Originally Posted by Luther
Nope, it is 6d x sqrt(lbs x 4 x REF)

Note parenthesis.
Ah, thats why I always have trouble with math :o( Mea culpa.
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Old 04-25-2006, 05:59 AM   #7
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Default Re: Explosives: Lethality of 1 pount of TNT

And again, This is whats my excel said:

range damage
0 42
1 14
2 7
3 4,666666667
4 3,5
5 2,8
6 2,333333333
7 2
8 1,75
9 1,555555556
10 1,4


This is realy bit low, at range 3+ there is no real danger. At range 2, this is a major wound.

Iam not a explosive expert, but what I know is that fragment kills and if you are face to explosion your lungs can be damaged.
And exlosive force vanish realy quickly thats true.

e.g. here in Czech republic, old airplanes was disasembled by explosives. It takes ~400lbs of Semtex (some plastic like C4, only better ;o)
to cut airplane like 737, to pieces.

So may be it is right.
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Old 04-25-2006, 07:44 AM   #8
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Default Re: Explosives: Lethality of 1 pount of TNT

Indoors, concussion kills by shock; The explosion instantly over-pressurizes the room. Thud!
So, even if the room isn't blow up per se, the people in it might die.

Maybe one could say that every character in a closed room takes aditional damage equal to what hits each wall+roof.
So if 1 pound of tnt went of on the floor of a in a 4x4x4 cube, preasure damage would be 7+7+7+7+3=31 points. Quite a lot, but then, it is supposed to hurt.
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Old 04-25-2006, 08:44 AM   #9
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Default Re: Explosives: Lethality of 1 pount of TNT

In Shadow Run there was the "chunky salsa efect" of explosives in cramped quarters.

Its similar to what you sugest, you count the distance from explosive to target, to wall, then from wall to target to other side wall, and so on wile the force of explosion still have some efect. This is done for each wall so it is not a quick rules to use during combat.
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Old 04-25-2006, 09:19 AM   #10
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Default Re: Explosives: Lethality of 1 pount of TNT

I'm familiar with the SR rule :) But, in GURPS damage detoriates so quickly the room would need to be very small for for damage to reflect. A wall 2 meters away from the blast would only reflect 3 points of damage to the point of the blast. Of course, this adds up for more walls.

I reformulated it to the above proposal to keep maths down, and to reflect the fact that where you are standing in the room is not that important..
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