[UT] [HT] 15mm Gyroc White Phosphorus

[Grayscale]

I'm trying to design a 15mm Gyroc (6d pi++) combined with the White Phosphorous warhead option from High-Tech (HT172) - I understand the rules mention 20 mm as the minimum caliber, but I'm choosing to overlook this.

So, HT says:

...Add a (0.5) armor divisor and a follow-up burning explosion with burning fragmentation. Hot fragments (p. B415) do 1d(0.2) burn every 10 seconds for a minute...

But what is the burning explosion damage?

6d? That would result in a 12 yd blast radius - contrast that to the HEC option from UT (which I'm also using) that for a 15mm Gyroc results in 2d cr ex and so a 4 yd blast radius.

[Varyon]

I believe there are WP munitions statted out in HT (grenades mostly, but maybe some warheads as well), so I'd say compare those to comparably-sized HE munitions to see how UT WP would likely compare to UT HE.

[Rupert]

Looking at the WP warheads detailed in High-Tech, 1d and a 5-yard burst would be generous for a 15mm warhead.

Damage has nothing to do with the projectile's base (kinetic energy based) damage, and is all about how much WP it can carry. A 120mm mortar round does 6d, 42-yards. A 60mm mortar does 2d, 15-yards. A WP grenade doesn't have any explosion damage, just a 5-yard burst.

You could have a 15mm WP round just do the WP burning damage to the target as a follow-up attack. Having the WP deep inside would make it very hard to remove, so that's a 'free' 6d burning damage, though over a long time period (in terms of GURPS combat).

[Grayscale]

Originally Posted by Varyon

I believe there are WP munitions statted out in HT (grenades mostly, but maybe some warheads as well), so I'd say compare those to comparably-sized HE munitions to see how UT WP would likely compare to UT HE.

I'll try and find those.

Originally Posted by Rupert

Looking at the WP warheads detailed in High-Tech, 1d and a 5-yard burst would be generous for a 15mm warhead.

You could have a 15mm WP round just do the WP burning damage to the target as a follow-up attack. Having the WP deep inside would make it very hard to remove, so that's a 'free' 6d burning damage, though over a long time period (in terms of GURPS combat).

That's an interesting idea and not something I had thought of. Still, the intended effect is this: https://www.youtube.com/watch?v=LiQoN1-Ks6Q

A WP grenade doesn't have any explosion damage, just a 5-yard burst.

I suppose this makes sense, so we would end up with 6d pi++ linked [1d(0.2) burn]. Does actually look like the scene I linked above.

[Rupert]

Originally Posted by Grayscale

I suppose this makes sense, so we would end up with 6d pi++ linked [1d(0.2) burn]. Does actually look like the scene I linked above.

According to HT it should have (0.5) penetration, and I'd say it's a follow-up, not a linked attack (HT also thinks that). Thus: 6d(0.5) pi++ follow-up [1d(0.2) burn]

Remember that if a an attack with a follow-up doesn't penetrate, you get the effect of a linked attack.

[MrFix]

HT does not list the damage because when it was created, it's creators were told 'no design systems'. That's why a lot of the ammo options in the book actually have no rules to apply them to something like AKM or Glock, as it would have to run off of calculating damage for caliber size, rather than projectile energy output.

I wanna say one thing though. All the smoke grenade 40mm etc have one thing in common - their normal HEAT/Penetrative damage etc is replaced with the one for Baton round (HT168), so reasonably your WP projectile would not deal it's full 6d pi++ dice and instead look something like...

1d+1 (0.5) cr
Follow-Up
1d [1d(0.2)] burn ex

This is in line with 40mm Smoke Grenades for something like M203, since WP is in effect a very spicy smoke that takes up majority of the projectile, leaving only a shell.

Incendiary or tracer bullets would be more effective...

[Grayscale]

Originally Posted by MrFix

HT does not list the damage because when it was created, it's creators were told 'no design systems'. That's why a lot of the ammo options in the book actually have no rules to apply them to something like AKM or Glock, as it would have to run off of calculating damage for caliber size, rather than projectile energy output.

I wanna say one thing though. All the smoke grenade 40mm etc have one thing in common - their normal HEAT/Penetrative damage etc is replaced with the one for Baton round (HT168), so reasonably your WP projectile would not deal it's full 6d pi++ dice and instead look something like...

1d+1 (0.5) cr
Follow-Up
1d [1d(0.2)] burn ex

This looks good too. I think I'll go with it.

Originally Posted by MrFix

Incendiary or tracer bullets would be more effective...

But those wouldn't have an "area of effect" capability, would they?