Setting up a remote control car is as much a science as it is an art,
the physics behind rc cars is exactly the same as the physics that
governs real cars, if you know how setup changes in a race car work, you
already know how to setup a remote control car.
The problem that
most people have with setting up RC cars is that when you make a change
in one area it always has a knock-on effect on the rest of your
settings, setups are very much a balancing act
To start with I'll
concentrate on the basics of handling, over steer and under steer. The
physics behind this is pretty simple, if you turn into a corner the
center of gravity will move in what ever direction you were initially
travelling. Your tires via friction push back with (hopefully) an equal
amount of force. When your wheels lose traction and start to slide the
energy that was being turned into heat in your tires gets released as
inertial energy in the original direction of travel. With cars, both
back and front don't break traction equally, this creates either under
steer or over steer, which is how we describe the experience the driver
has under these conditions.
Under steer
Under steer is when
the front of the car loses traction while the rear of the car still has
grip on the tar, the effect is that the nose of the car drifts away from
the direction you are turning, turning harder makes it worse, the only
thing you can really do is back off the throttle and bleed off speed.
Over Steer
Over
steer is the opposite of under steer, and in most cases it's best to
have a little of this. The front of the car keeps traction while the
rear lets go. One of the key benefits is that you can typically corner
much faster in a car that has some over steer
Over steer / Under steer Tuning tips
There
are a lot of ways to tune the handling or your radio controlled car,
the easiest is to adjust the front and rear shocks. While there are a
lot of options with springs, different oils and all sorts we are just
going to concentrate on the basics, most decent shocks have adjustments,
either with spacers or bolts that let you adjust how hard or soft the
shocks are.
As far as maximum and minimum stiffness goes, make
sure that the bottom of your car doesn't scrape the ground, and on the
other end make sure it doesn't bounce and leave the asphalt, apart from
that you need to find the setup that matches your driving style, most
people get winning setups off the internet and try to learn to drive
them, mind you this is a great starting point, and most championship
winners post their setup sheets
Shock Stiffness guide
Stiffen in front = increasing under steer or reducing over steer
Stiffen in rear = increasing over steer or reducing under steer
You
may be wondering why one setting makes two changes, this is because
it's all about balance, you could for example setup your rc car by only
every changing the rear stiffness, but you would find that when you got
the perfect amount of over steer under braking the car would then be
uncontrollable during the exit of the corner. It's all about balance,
Another
thing to keep in mind is that when you change the shocks you also
change the roll of the car, this the the chassis of the car moving with
the inertia, in effect pushing the front tires into the road during
breaking and the rear during acceleration. If your shocks are too soft
then the transfer might dig your front wheels in and lift the rear
enough to make you car spin out, or lose steering under throttle, you
have to find the right balance
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