Rice Lake Intercomp SW Deluxe Portable Vehicle Scale User Manual
Page 32
SW Users
REV G, February, 2000
32
1) The first requirement is to measure the wheel base. Center of gravity will be
measured from the center of the hub for the vertical C.G. For our calculations we
must select the center of the front hub for the math to work out correctly. Use inches
to the nearest tenth of an inch.
2) Weigh the car. Form total weights for the rear axle and total weight.
3) Multiply the rear axle weight by the wheel base measurement giving rear moment.
4) Find the longitudinal C.G. by dividing the rear moment by the total weight. Call this
the flat C.G.
5) Lift the rear end.
6) Weigh the car. Form total weights for the rear axles and total weight.
7) Multiply the rear axle weight by the wheel base measurement.
8) Find the longitudinal C.G. by dividing the rear moment by the total weight. Call this
the lifted C.G.
9) Solve this equation: Vertical C.G. = (wheel base X (flat C.G. - Lifted C.G.)) / lift
10) Add the hub height to get vertical C.G. above ground.
See Figure 2 for a summary