| From: | Tzeentch tzeentch666@*********.net |
|---|---|
| Subject: | Building a Better Cyberlimb Part 1 |
| Date: | Tue, 2 May 2000 18:53:47 -0700 |
in my Shadowfuzion project and would like to maybe get some feedback on
stuff I've been working on:
Much of this data will be using values derived from GURPS - specifically
determining limb volumes. I'm modifying the values a bit (but they still
give about the same results) to take into account a range of Body ratings
and heights (hence shorter arms).
HOW BIG IS THAT LIMB?
1. According to M&M an ECU is approx. 50 cubic centimeters of space.
2. GURPS Robots notes the average human arm is about .1 cf
3. GURPS uses weight in pounds/1000 to get arm voume and /400 to get leg
volume.
4. I'm thinking of using (height in inches/20 + Body) x .01 for arm volume,
x.02 for leg volume.
5. In Shadowrun an giants arm can hold just as much as a dwarfs arm. I'm
throwing that out because it flies in the face of common sense.
6. 50cc is .00176575 cf. I'll round to .002. Thus the average arm in SR
holds only about .02 cf worth of stuff. Curious no?
If we assume that GURPS ST-7=SR Strength then we can get down to some
business. Assuming TL8 we see that for arm motors they weigh .2 pounds/ST
point. So to get ST 3 in SR we need a ST10 motor. That's (10 x .2) 2 pounds
of motors. The rough guide in GURPS is weight/50 for volume. So we then get
.04cf already used just for human-standard strength. Of a standard .1 cf
limb that leaves us with .06cf to play with. So where does the other .04 cf
go?
Well, a cheap copout is to say it needs interface gear and hookups to the
body (via a collar or whatnot). This consumes Body Rating x.01 in cf.
Voila! Since the volume assumptions generally take into account full limbs
what about the partial cyberlimbs? Easy enough chummer, just use the
following "expanded" values!
*Note: For the motor multiplier I scaled the TL8 arm and leg motors up the
used the same vol multiplier as for the limb. Since a full arm is .1 cf I
used x10. Simple enough, just pointing that out in case you are wondering
how I got the Motor Multiplier.
Replacement Vol. Multiplier Motor Multiplier
Hand/Foot x.002 x.004/x.012
Full Arm x.01 x.2
Full Leg x.02 x.6
Upper Arm x.006 x.012
Lower Arm x.004 x.008
Upper Leg x.012 x.072
Lower Leg x..008 x.048
Skull x.02* None
Torso x.007** None
* Assumes brain and other organs take up most of the available area. Assumes
areas of the skull are removed to make room.
**Assumes that organs are left intact for the most part. Areas of intestine
and nonessential organs may be removed.
Note: Assumes TL8 arm and leg motors. Leg motor multiplier gained from TL8
leg motors but with the multiplier divided by 10 to account for 10 ST=3 SR
Strength. It was then multiplied by .1kW.
CONVERTING ECU TO CUBIC FEET
Multiply ECU cost by .002
ROUGH CF TO WEIGHT
Multiply cf by 50. For example, an stock cyberdeck (4 ECU) comes to .008 cf
and .4 pounds (.18kg)
ROUGH NORMAL LIMB WEIGHT
Based on the anthropometry software and some datasets I found on the net
here is some limb weight percentages. Note that I tried to put data for
dwarves and trolls into the software but it would not accept the values ;)
Total Body Weight
Individual Segments Expressed as a Percentage of Grouped Segment
Weight
Head and Neck: 8.4%
Head: 73.8%
Neck: 26.2%
Torso: 50.0%
Thorax: 43.8%
Lumbar: 29.4%
Pelvis: 26.8%
Total Arm: 5.1%
Upper Arm: 54.9%
Forearm: 33.3%
Hand: 11.8%
Total Leg: 15.7%
Thigh: 63.7%
Shank: 27.4%
Foot: 8.9%
Ken
---------------------------
There's a war out there, old friend, a world war. And it's not about who's
got the most bullets, it's about who controls the information. What we see
and hear, how we work, what we think, it's all about the information!
Cosmo, 'Sneakers'
