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Old 12-02-2013, 07:18 PM   #1
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Join Date: Mar 2008
Location: Arkansas
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Default Another 4 Link Thread

Warning: I will keep this as short as possible, but its still going to be long.




The web is full of charts, diagrams, calculators, discussions, and terminology concerning suspension setups. There is much to be learned, but a good deal of it either has nothing to do with rc crawlers, or is extremely vague and confusing. While the calculations and physics are the same, the goals and end results are typically very different between the vehicles. Drag cars, monster trucks, street rods, even some 1:1 offroad rigs all have varying reasons for their setups that are not always things we should concern ourselves with, but sometimes the methods they use are.

I spent much of the year away from crawling and focusing on short course racing. At some point I dove headfirst into suspension tech and learned quite a bit. The biggest thing that I learned was how to correlate that tech between different platforms and designs. It removed much of the confusion I had before when studying pictures and diagrams.

I will tell you now that this may be a long read. I want to keep everything as simple and short as possible, but going into depth is unavoidable at times. I do not know everything, nor claim to, but I feel that sharing a basic grasp of what is going on will help everyone. Everything I am sharing deals directly with rc crawlers, and will reference the 1:1 world rarely and only as examples.

I am going to do a basic rundown of what will be covered, then expand on each point with a separate post. Again, this will only be in relation to rc crawlers. I don't care how real trucks are set up because these aren't real trucks.

All discussion is welcome, as well as corrections if I get something wrong. I do ask that all discussions be based upon the expanded posts as I post them and not ahead of time.



Terminology!



Squat (S) and Anti-squat (AS)

The biggest topic of discussion here at RCC is antisquat. What is antisquat? To understand antisquat (AS) you have to know what squat (S) is. S is the motion of the rear of the vehicle under acceleration. As the vehicle accelerates forward, its weight is pulled back and causes the rear to drop, or "squat". AS is the resistance to such motion.


Torque Twist (TT)

Something that quite possibly ties for most discussed here is TT. TT is the force of motion induced between two points that are not rigidly tied together. The first and originating point being the one producing the force, and the second being the one receiving it. Very commonly found with shaft driven rigs.

Line of Force (LF)

I bet this is one that most haven't considered, or probably heard of before. The LF is the angle and direction that the suspension applies force through the chassis. LF goes hand in hand with S/AS values.


Center of Gravity (CG)

CG is the exact balance point, both horizontaly and vertically, of the vehicle. This is the point that gravity pulls from. A high CG will be top heavy and easy to tip, a low CG will be the opposite.


Ride Height (RH)

Simply put, the distance between the ground and the bottom of the chassis.


Roll Center (RC)

RC is the point that the chassis pivots or rolls on. A low RC has more chassis roll, a high RC has less. The axles also have their own individual RC's.


Instant Center (IC)

IC is the point in space where the upper and lower suspension links meet. It is used to determine AS values, the LF value, and the RC value.

Last edited by Duuuuuuuude; 12-03-2013 at 01:17 AM.
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