Associated RC12R5
12-30-2008, 08:50 PM
#871
It makes the upper arm longer which smooths out the steering a bit. With the longer upper arm there is also less camber gain. This little trick is just a tuning option 
12-31-2008, 01:56 AM
#876
Tech Master
Join Date: Sep 2007
Location: Oreganastan Pacific Wonderland home to Indoor Farming
Posts: 1,059
Yes,it does!
12-31-2008, 08:10 AM
#877
Umm,,, I think he just raised the roll center.
12-31-2008, 08:42 AM
#878
Tech Fanatic
Also keep in mind that at the worlds, the Associated team was the only team with access to Masami's secret tire foam. It was probably the same foam that Masami used to win the worlds in Florida a few years back. I also saw pictures of other teams from the first days of the worlds that where mounting foam in an attempt to find that elusive rear traction. Have not seen that happen in a long time!! I even saw a picture of Andy Moore mounting foam on wheels.
12-31-2008, 10:02 AM
#879
There was a rear bite issue at the worlds this year. The 1/12th scale cars just could not get enough rear traction. If you go back and look at any of the pictures from the 1/12th worlds, you will see that every car had a Gurney lip on the back of the body in an attempt to get more rear bite. When was the last time you saw anyone running a Gurney lip on a 1/12th car at any big event? One of the ways you can get more rear bite, or balance, is to decrease front bite. By lengthening the upper A arm, you decrease the camber gain through the movement of the suspension making for less aggressive front bite. It does not change the front roll center. Only changing the angle of the upper A arm in relation to the lower A arm or surface of the chassis, changes the roll center.
Also keep in mind that at the worlds, the Associated team was the only team with access to Masami's secret tire foam. It was probably the same foam that Masami used to win the worlds in Florida a few years back. I also saw pictures of other teams from the first days of the worlds that where mounting foam in an attempt to find that elusive rear traction. Have not seen that happen in a long time!! I even saw a picture of Andy Moore mounting foam on wheels.
Also keep in mind that at the worlds, the Associated team was the only team with access to Masami's secret tire foam. It was probably the same foam that Masami used to win the worlds in Florida a few years back. I also saw pictures of other teams from the first days of the worlds that where mounting foam in an attempt to find that elusive rear traction. Have not seen that happen in a long time!! I even saw a picture of Andy Moore mounting foam on wheels.
12-31-2008, 10:38 AM
#880
There was a rear bite issue at the worlds this year. The 1/12th scale cars just could not get enough rear traction. If you go back and look at any of the pictures from the 1/12th worlds, you will see that every car had a Gurney lip on the back of the body in an attempt to get more rear bite. When was the last time you saw anyone running a Gurney lip on a 1/12th car at any big event? One of the ways you can get more rear bite, or balance, is to decrease front bite. By lengthening the upper A arm, you decrease the camber gain through the movement of the suspension making for less aggressive front bite. It does not change the front roll center. Only changing the angle of the upper A arm in relation to the lower A arm or surface of the chassis, changes the roll center.
Also keep in mind that at the worlds, the Associated team was the only team with access to Masami's secret tire foam. It was probably the same foam that Masami used to win the worlds in Florida a few years back. I also saw pictures of other teams from the first days of the worlds that where mounting foam in an attempt to find that elusive rear traction. Have not seen that happen in a long time!! I even saw a picture of Andy Moore mounting foam on wheels.
Also keep in mind that at the worlds, the Associated team was the only team with access to Masami's secret tire foam. It was probably the same foam that Masami used to win the worlds in Florida a few years back. I also saw pictures of other teams from the first days of the worlds that where mounting foam in an attempt to find that elusive rear traction. Have not seen that happen in a long time!! I even saw a picture of Andy Moore mounting foam on wheels.
12-31-2008, 10:40 AM
#882
Yeah Crashby...you're an ID10T. You've only been doing this for 20+ years 
I agree with you though 
I agree with you though
12-31-2008, 10:55 AM
#883
Tech Fanatic
12-31-2008, 10:57 AM
#884
Tech Fanatic
on the contrary my friend, on asphalt they are looking for the most total grip. so taking grip away from the front only lowers your corner speed. but if you add rear downforce while maintaining the same front grip that nets you more low speed steering with more total high speed grip...
12-31-2008, 11:41 AM
#885
I've been doing this for almost 30 years now and changing the ratio of the length or the upper arm and lower arms including the angle of the upper arm effects the ROLL CENTER. What ever effect you may have described is in fact a ROLL CENTER change. Raising the roll center make the wheel camber gain and lowering it does the opposite. And I AM John St.Amant thank you.
I may resemble your remark, but concidering the source....
remember some values are absolute and usually refered to as positive when it is actually and commonly not refered as a negative value.
I may resemble your remark, but concidering the source....
remember some values are absolute and usually refered to as positive when it is actually and commonly not refered as a negative value.
