Higher TL arms ought to be stronger for the same volume.
Fair enough.
Updated draft language of the whole section (and no I didn't proof it very carefully yet, so if it's hopelessly inconsistent, let me know.)
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Manipulator Arms
A manipulator arm is a remote appendage, culminating in a claw or mechanical hand. These can vary greatly in size, strength and dexterity. Normally, a driver or other crew control these arms using a waldo, though remote or robot control of arms is also a possibility on vehicles that support it. All manipulator arms require a powered vehicle.
Robot-Sized Manipulator Arms
Smaller vehicles (four Spaces or less) may install robot arms created using the rules in the Robot Handbook (pages 25-28). Up to four vehicle-installed robot manipulators can be installed using one vehicle Space. A vehicle sized at one Space may install two Size 5 (or smaller) manipulators without using its only Space.
If desired, a vehicle larger than four Spaces could install additional robot arms using a Space for every four arms.
Manipulator Arm
In most cases vehicles larger than four Spaces require longer reach and more internal space to support a ‘shoulder’ socket than is available with a robot arm. These arms are listed in the Manipulator Arm table, with Spaces and Cost per arm. An arm’s dexterity is based on the Tech Level of the vehicle, not necessarily the minimum Tech Level listed in the table. The STR value of these manipulator arms can be increased by +1 for each doubling of the Cost of the manipulator arm to a maximum of +5 or 32 times the listed Cost.
Manipulator Arms
Manipulator Arm | TL | STR | DEX | Spaces | Cost |
Primitive | 5 | 7 | TL-3 | 1 | Cr1000 |
Basic | 7 | 12 | TL-3 | 1 | Cr2000 |
Improved | 8 | 12 | TL-2 | 1 | Cr5000 |
Enhanced | 9 | 15 | TL-1 | 2 | Cr10000 |
Advanced | 10 | 15 | TL | 2 | Cr15000 |
Heavy Manipulator Arms
Large vehicles can install even larger arms that are the equivalent of dexterous cranes on forklifts. These arms can individually pick up and hold objects up to 50% of the vehicle’s Spaces or 250 kg for every Space of the vehicle. For instance, a vehicle of 64 Spaces with two arms can use both together to pick up one object of up to 64 Spaces or 32000 kilograms. This increases by one half Space (round down) and 250 kg for each Tech Level above 10.
The STR value of a heavy manipulator arm is equal to the Tech Level plus the number of Spaces in the vehicle. As with smaller manipulator arms, STR can be increased by +1 for each doubling of the Cost of the manipulator arm to a maximum of +5 or 32 times the listed Cost. Each increase of STR also increases the carrying capacity of the arm by half of a Space and 250 kg. STR is also relevant when computing damage from a heavy manipulator arm melee strike. An arm inflicts damage equal to 2D + 1D for every 10 STR, rounding up. The number of Spaces consumed, and the Cost of a heavy manipulator arm are based on vehicle Spaces. An arm’s dexterity is based on the Tech Level of the vehicle, not necessarily the minimum Tech Level listed in the table.
Vehicle-sized manipulator arms have too little surface area, and vehicles are too massive to allow these arms to cling to a surface with like a robot with gecko grippers, but a vehicle with two or more heavy manipulator arms can theoretically use these arms to lift itself and climb a vertical surface, assuming there are handholds large enough to grab.
Heavy Manipulator Arms
Manipulator Arm | TL | DEX | Spaces* | Cost per Vehicle Space |
Basic | 7 | TL-3 | 5% | Cr1000 |
Improved | 8 | TL-2 | 5% | Cr2000 |
Enhanced | 9 | TL-1 | 4% | Cr5000 |
Advanced | 10 | TL | 3% | Cr10000 |
*Heavy Manipulator Arms consume at least two Spaces
Manipulator Arm Weapons Mounts
Any manipulator arm can have an attached fixed weapon mount (see page XX). The firing arc of a manipulator arm fixed mount is determined by the reach of the arm, which is normally 180 degrees, though a top-mounted arm may have a full 360 degree arc of fire, and arms mounted on two-legged walkers may benefit the rotation of ‘hips’ to increase the firing arc.
Fixed mounts attached to manipulator arms have weapon size limits based on the size of the arm. Limits for robot arms are described in the Robot Handbook on page 61. Regular-sized manipulators are limited to weapons requiring 1 Space or massing less than 250 kg. A heavy manipulator arm can support a weapon equal to 20% of its Spaces, rounding up, or 250 kg of weapons per for every 5 Spaces or fraction thereof.