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Body roll centre
The body roll centre is the theoretical point around which an axis of the
vehicle tilts in a curve. The body roll centre results from the geometry of
the chassis. If you draw two lines parallel to the upper (a) and the lower
(b) control arm on each side, these two lines intersect on the opposite
side. If you connect this point of intersection (c) to the wheels' connec-
tion points with the ground, the body roll centre is at the intersection of
this line and the centre line of the model (x):
When the body roll centre is low, the leverage of the centre of gravity is
high and the vehicle has a higher tendency to tilt around the roll axis in
curves.
You can change the body roll centre by attaching the upper control arms
of the front and the rear axles at different steering points. This changes
the angle between the upper and the lower control arm.
• A low body roll centre increases road grip and enhances the cornering
grip at the curve exit.
• A high body roll centre reduces the lateral inclination, the vehicle is
more agile.
Changes must be made identically on both sides!
Changing the body roll centre also affects other vehicle
settings!
f) Automatic Two-Speed Transmission
Function and setting of two-speed transmission
Two pinions with a different number of teeth are tightly screwed onto the clutch bell. The two main pinions on the centrifugal clutch are connected with each other
via a one-way bearing. The shift point depends on the revolutions. In the first rate of speed the engine speed is transmitted from the small pinion on the clutch
bell onto the bigger toothed wheel on the drive section, the toothed wheel for the second rate of speed runs idle. At high speeds the centrifugal force causes the
lever of the centrifugal clutch to be pulled outward towards a spring resistance and the attachment on the toothed wheel grips into the second rate of speed. The
engine speed is now transmitted via the larger pinion of the clutch bell to the smaller toothed wheel in the drive section, the toothed wheel in the first rate of speed
is running via the one-way bearing. The shift point of the two-speed transmission can be adjusted.
Setting the Switching Moment on the 2-Gear Drive
The spring resistance of the centrifugal clutch, and with it the switch
point, can be adjusted with a headless screw.
Put down the model so that the wheels can turn freely.
Turn the main pinions on the two-speed transmission until the clearance
in the cover of the two-speed transmission is visible. You can access the
headless screw from the left.
Turning in the screw: The spring preload is increased.
Higher revolutions are needed so that the attachment to grips.
The transmission switches later.
Unscrewing the screw: The spring preload is lowered.
Lower revolutions are needed so that the attachment grips.
The transmission switches earlier.
If you are a beginner and are facing problems with the driving
speed, we recommend that you postpone the switch point
until the model does not switch into second gear at all.
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