In GURPS 4th edition an explosives fragmentation damage has been tied to the diameter of the warhead that carries it, that is the warheads diameter (in millimeters)/20. Now this works good enough in most cases but some warheads are designed to create an enhanced or heavier fragmentation effect. Below I cover two warhead options to get more fragmentation bang for your buck. See this post for even more Ultra-Tech warhead options.
High Explosive Enhanced Fragmentation Warhead (HEEF) (TL 9)
This warhead uses either a thicker or denser case to create an enhanced fragmentation effect with greater penetration and wounding potential. Due to the stronger case, the warheads blast effect is reduced.
Blast effect damage is figured as the square root (warhead weight)×19.8. Divide the product by 3.5 to get dice of damage. Damage is crushing explosive.Fragmentation damage is figured as Warhead Diameter (in millimeters)/12 in dice of damage. Damage is cutting fragmentation damage.
Add +1 per die to the crushing explosive damage at TL10-12. This warhead is only available for 15mm or larger. Double normal cost.
HEEF projectiles, with the exception of hand grenades, that are built at TL 9 or higher can incorporate a programmable fuse that can be set for either impact or, if the target is at least 40 yards away or farther, for proximity detonation see Ultra-Tech pg. 154. Grenades and satchel charges with HEEF warheads inflict the damage shown below. When set for impact detonation,guns and launchers with HEEF warheads inflict their normal piercing damage with a (0.5) armor divisor, plus a follow-up attack causing the damage shown below.
HEEF Table
Warhead Damage
15mm 1d-2 cr ex [1d+1]
18.5mm 1d-1 cr ex [1d+2]
25mm 1d cr ex [2d]
30mm 1d+1 cr ex [2d+2]
40mm 2d cr ex [3d+1]
64mm 4d cr ex [5d+1]
100mm 8d cr ex [8d+1]
130mm 12d cr ex [11d-1]
160mm 8d×2 cr ex [6d×2]
400mm 4d×16 cr ex [5d×7]
Continuous Rod Warhead (TL 9)
This is a special type of High Explosive Enhanced Fragmentation Warhead. A Continuous Rod Warhead surrounds the explosives with a bundle of metal rectangular rods welded to one another at the top and bottom in an alternating pattern.
When the warhead goes off, the bundle of rods are propelled outward in an expanding ring, unfolding like a circular accordion gate.This effect not only greatly increases the warheads lethality against thin skinned targets, though it is less effective against thicker skinned or armored targets. Up until the ring finally breaks apart it is far more likely to hit targets within its effective range then standard fragments (with hit probability dropping at a rate of 1/R rather than 1/R2 as for conventional fragments).Even after the ring breaks the rods are still dangerous and have the hit probability of a normal fragmentation warhead.
While effective, Continuous Rod Warheads are more complicated and expensive to build then normal fragmentation warheads. They are also more effective with larger warheads (the first production warhead was the early TL 7 710mm RIM-8 Talos with a 30 yard effective range!).
A Continuous Rod Warhead has similar effects to a High Explosive Enhanced Fragmentation Warhead only the fragments have an armor divisor of (0.5) and fragmentation has both a primary and a secondary threat range. In the primary threat range the chance of scoring a hit is increased.
The fragments still hit with a skill of 15 but penalties do to range to the target are ignored. Primary threat range is fragment dice of damage × 0.5 yards.
In the secondary threat range use the normal fragmentation rules with the exception that you trace the range from the end of the primary threat range when figuring range penalties- not the center of the blast.
Blast effect damage is figured as the square root (warhead weight)×19.8. Divide the product by 3.5 to get dice of damage. Damage is crushing explosive.
Fragmentation damage is figured as Warhead Diameter (in millimeters)/12 in dice of damage. Damage is cutting fragmentation damage with a (0.5) armor divisor.
Add +1 per die to the crushing explosive damage at TL10-12. This warhead is only available for mm 64mm or larger. Five times normal cost.
Continuous Rod projectiles are always set for proximity detonation- see Ultra-Tech pg. 154.
Continuous Rod Warhead Table
Warhead Damage Effective/Secondary
64mm 4d cr ex [5d+1] 3 yrd./26 yrd.
100mm 8d cr ex [8d+1] 4 yrd./41 yrd.
130mm 12d cr ex [11d-1] 5 yrd./54 yrd.
160mm 8d×2 cr ex [6d×2] 6 yrd./60 yrd.
400mm 4d×16 cr ex [5d×7] 18 yrd./175 yrd.
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