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Message no. 1
From: R Andrew Hayden <rahayden@*****.WEEG.UIOWA.EDU>
Subject: RE: Suggested Equations
Date: Thu, 11 Feb 93 21:52:50 CET
Ok, some comments ont he equations posted up for engine

1) Engine Power = Engine Size (NPUs) ^2

# First, the idea of 'kgmph' is incompatible with shadowrun,
which is a purely metric system. Furthermore, using
'kg-km' or anything like that could get complicated as we
try to balance everything out. What I would say is just us
'Engine Power' with no unit of measure. Nice and simple

# Second, I think that equation will work, though.

# Third, this does not properly differentiate between gas and
electric engines. How about this:

Gas: Power = NPU^2
Elec: Power = (NPU^2) * .85

2) Cruising Speed = Vehicle Weight/Engine Power

# I think you have this backwards. Unless the engine power
was dramatically less than the weight of the vehicle, you
would have a speed of <1. Instead use Power/Weight.

3) Redline Speed = Cruising Speed * 2

# Nice and simple

4) Economy = no suggestion

# how about something like this:

Economy (km/liter) = Power / (2 * Weight)


Using the above equations on a 5,000kg car with a 400npu engine
yields the following results:

Power: 160,000
Cruising: 32 km/hr
Redline: 64 km/hr
Economy: 16 km/liter

Obviously, this car is very underpowered, as is shown by its
cruising speed. So lets take the same car, and put in a larger
engine. Let's pretend we are taking stuff out so the weight is
exactly 5,000 in the end. We'll throw in a 600npu engine.

Power: 360,000
Cruising: 72 km/hr
Redline: 144 km/hr
Economy: 36 km/liter

Hmm, I immediately noticed that with a larger engine, our economy
goes up. I don't know if that is accurate, per se.

Also, a 72 km/hr cruising speed is kinda slow, as 100 km/hr is
roughly equal to 60 mph or so. I don't have the chassis tables in
front of me, though, so I don't know if that is realistic
considering the weight being moved.


The last thing we have to come up with is how to compute
acceleration. I'm at a loss here. Suggestions?

[> Robert Hayden <] [> ____ Come out, Come out <]
[> <] [> \ /__ Wherever you are! <]
[> rahayden@***** <] [> \/ /
[> aq650@****.INS.CWRU.Edu <] [> \/
Message no. 2
From: R Andrew Hayden <rahayden@*****.WEEG.UIOWA.EDU>
Subject: RE: Suggested Equations (fwd)
Date: Fri, 12 Feb 93 03:52:49 CET
This message came to me personally, I am forwarding it to the list.

[> Robert Hayden <] [> ____ Come out, Come out <]
[> <] [> \ /__ Wherever you are! <]
[> rahayden@***** <] [> \/ /
[> aq650@****.INS.CWRU.Edu <] [> \/

---------- Forwarded message ----------
Date: Thu, 11 Feb 93 18:33 EST
From: CSD108@*****.PSU.EDU
To: rahayden@*****
Subject: RE: Suggested Equations

My GM and I are in the process (slowly) of hammering out new vehicle combat
rules (only for our use) and one thing I came up with (off the cuff) for
acceleration was a(max)=(top speed-current speed)/5. Of course, this requires
you to know how fast you're going right now. :) Also, /4 would produce better
results, but it's harder to calculate, and I imposed an arbitrary lower limit
of 5, otherwise, you'd never be able to get to top speed.

As for basing accel. on engine power, I don't have a clue.


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