The Chaosium Digest

The Chaosium Digest supports the role-playing games produced by Chaosium Inc. and all content is fan submitted. Begun in 1994 by Shannon Appelcline who passed it to myself in 2000 and previously distributed via email, this is the newest incarnation of the Chaosium Digest. Enjoy!

Tuesday, October 19, 2010

Chaosium Digest Classics: Vehicle Building Rules

by Dany St. Pierre
Originally published in The Chaosium Digest Volume 32, Number 11, Saturday, December 23, 2000

Although CoC has rules for vehicles it doesn't include rules for building them. I`ve bashed together some quick rules for constructing and driving simple vehicles in my CoC game.

The player has the right to have a normal car for free in the beginning of the game, The Keeper may also simply assign a maximum of points for a player to spend (a total equal to the INT of the PC is a good guideline).


TYPE                      BASE COST BY MPH     ADDITIONAL COST
Ground vehicle           1 pt. per 10 MPH
Submarine                  1 pt. per 10 MPH             Adaptability +6*
Boat                           1 pt. per 5 MPH
Helicopter                  1 pt. per 10 MPH              Hover +2
Tunneler                     1 pt. per 1 MPH             +2 for each class of protection above 1*
                                                                           Adaptability +3*
Airplane                     1 pt. per 20 MPH
Supersonic aircraft   16 pts for mach 1             +2 for additional mach, Adaptability +3*


SIZE RANGE       (BRP) SIZE      EXAMPLE                     PROTECTION
20 kg to 200 kg     (7 to 24)           Motorcycle/scooter          6 points
436kg to 733kg     (33 to 39)         Small car                          8 points
1 ton to 3 ton         (45 to 55)         Helicopter/limousine         10 points
4 ton to 10 ton       (60 to 70)         Truck/light tank                12 points
                                                      DC2 and 3/Ford trimotor

*Adaptability protects the pilot or driver from hostile environments.
-- Submarine: underwater preassure and asphyxiation.
-- Tunneling: heat and asphyxiation.
-- Supersonic aircraft: high altitude and asphyxiation.


Sports car                       2/10 of maximum speed                                   +20%
Common car                   1/10 of maximum speed                                     +0%
Limousine                       1/10 of maximum speed                                    -10%
Pickup truck, van            1/10 of maximum speed                                    -10%
Light Tank                      1/10 of maximum speed                                    -10%
Police car                        2/10 of maximum speed                                   +20%
Standard plane                2/10 of maximum speed                                     +0%
Combat plane                  4/10 of maximum speed                                   +20%


Gain +1% to Investigator's Piloting skill per 10 mph the plane has of superior speed (x2 if you have a combat plane and your opponent has an ordinary one). If you win a contest of skill you have the right to shoot your foe with your weapons. When a vehicle has taken a total of 20 points of damage beyond it's defense it is considered out of action. It has to be fixed or replaced.


An investigator can ram a foe, using the mass and speed of his vehicle to do damage. Each 10 mph does 1D6 of damage. A vehicle of size 7 to 24 has a 1D6 of basic damage, 33 to 39 2D6, 45 to 55 3D6 and 60 to 70 4D6. The vehicle takes 1/6 of the damage done. The vehicle's protection counts toward this damage.


Hitting curb, obstacle or pedestrian -20%
Hitting lose debris -5%
Light rain, gravel on road -5%
Heavy rain, light snow, oil on road -10%
Heavy snow or ice -20%
Colliding or sideswiping any vehicle or large object (shoggoth) -30%
Losing a Tire -25%


In simple terms, the Model T changed the world. It was a powerful car with a possible speed of 50 mph and ran 25 miles on a gallon of gasoline. It had a 20 horsepower side-valve four-cylinder engine, two-speed planetary transmission and a 100 inch wheelbase. Important to the long-term success of the Model T was Childe Harold Will's experiments with the properties of vanadium steel which resulted in the lightness and durability that was an important trademark of the Model T.

TYPE: ordinary car WEIGHT: 1 ton(45) SPACE: 1 driver 3 passengers
SPEED: 50 mph PROTECTION: 10 COST: (5+10):15

These are little two-seater convertibles for the fast lane drivers. If speed is your need, look no further. The Stutz is a four-speed, 150 mph joyride. No actor or actress will be caught in anything less.

TYPE: sport car WEIGHT: 733kg(39) SPACE: 1 driver 1 passengers
SPEED: 150 mph PROTECTION: 8 COST: (15+8):23

The L6500 cargo carrier is one of several Mercedes-Benz trucks that saw considerable use. The cargo area is open for ease of loading and unloading, although a canvas top is often added to provide some protection from the weather. With a cargo capacity of roughly 5,900kg, its the reliable workhorse you use to transport the lost ark or the bizarre altar with strange glyphs on it.

TYPE: truck WEIGHT: 6 ton(60) SPACE: 1 driver 1 passengers
SPEED: 80 mph PROTECTION: 12 COST: (8+12):20

This highly effective British design, dating from 1929 was developed by Vickers. The MKIIa is notable in that it is designed to be crewed by only two individuals. One serves as driver, the others as commander/gunner. With a maximum 10mm of armor, the MKIIa is a light, maneuverable vehicle, perfectly suited to shoot-and-scout situations, or infantry support roles. The MKIIa's main armament is two 303 caliber Vickers heavy machine guns (ROF:20 shots:250 range:110 yards malf:99-98-85) increasing the vehicle's effectiveness against infantry or Cthulhu cultists.

TYPE: light tank WEIGHT: 10 ton(70) SPACE: 1 driver 1 passengers
SPEED: 40 mph PROTECTION: 12+8 COST: (4+20):24

Labels: , ,


Post a Comment

<< Home