21LikesRadio Control Hobbies & Raceway - Waterbury, CT.
12-30-2013 | 04:52 PM
Phu, the roll center is the virtual "center" around which the chassis rolls. In other words, it is a virtual axis of rotation. If you take the camber links and extend a virtual line from them from both the left and right sides, the point of intersection plays a role in determining this axis of rotation. As the inner ball stud drops, this intersection point raises, and therefore the roll center raises.
Roll Center is not the same as the Center of Gravity, and can be adjusted independently (for the most part).
The closer the RC is to the COG, the less the chassis will roll in a corner. This will make the car react more quickly, as you're not waiting for the car to actually roll before it starts changing direction. This lack of roll results in a car that will rotate more freely though a corner.
Lowering the inner ballstud height, e.b. shaving the rear brace on a B4, will raise the RC. This is an adjustment best suited for high traction, or tight, point-and-shoot style tracks.
I'm tired of typing, so raising the inner stud on a B4 will have the opposite effect. It will move the RC further away from the COG, resulting in increased chassis roll. This will tame down initial steering, but will put more weight on the outside wheels in the middle/exit of a corner.
For those that want to try it out, rear RC adjustments are more pronounced than front. Start off with no washers under the inner ballstud, reset your camber, and turn a few laps. You should notice more turn in, and more rotation though the corner (e.g. looser).
Now go back and add 2mm worth of spacers under the inner ballstud (this is a BIG change). You'll notice that now the car is more stable, and easier to drive, at least at RCHR.
http://users.telenet.be/elvo/3/3.html
^ lighter read than the "tune with camber links" thread.
12-30-2013 | 05:52 PM
Tech Fanatic
iTrader: (11)
Joined: Nov 2011
Posts: 877
From: Connecticut
^This
Roll Center is not the same as the Center of Gravity, and can be adjusted independently (for the most part).
The closer the RC is to the COG, the less the chassis will roll in a corner. This will make the car react more quickly, as you're not waiting for the car to actually roll before it starts changing direction. This lack of roll results in a car that will rotate more freely though a corner.
Lowering the inner ballstud height, e.b. shaving the rear brace on a B4, will raise the RC. This is an adjustment best suited for high traction, or tight, point-and-shoot style tracks.
I'm tired of typing, so raising the inner stud on a B4 will have the opposite effect. It will move the RC further away from the COG, resulting in increased chassis roll. This will tame down initial steering, but will put more weight on the outside wheels in the middle/exit of a corner.
For those that want to try it out, rear RC adjustments are more pronounced than front. Start off with no washers under the inner ballstud, reset your camber, and turn a few laps. You should notice more turn in, and more rotation though the corner (e.g. looser).
Now go back and add 2mm worth of spacers under the inner ballstud (this is a BIG change). You'll notice that now the car is more stable, and easier to drive, at least at RCHR.
http://users.telenet.be/elvo/3/3.html
^ lighter read than the "tune with camber links" thread.
Roll Center is not the same as the Center of Gravity, and can be adjusted independently (for the most part).
The closer the RC is to the COG, the less the chassis will roll in a corner. This will make the car react more quickly, as you're not waiting for the car to actually roll before it starts changing direction. This lack of roll results in a car that will rotate more freely though a corner.
Lowering the inner ballstud height, e.b. shaving the rear brace on a B4, will raise the RC. This is an adjustment best suited for high traction, or tight, point-and-shoot style tracks.
I'm tired of typing, so raising the inner stud on a B4 will have the opposite effect. It will move the RC further away from the COG, resulting in increased chassis roll. This will tame down initial steering, but will put more weight on the outside wheels in the middle/exit of a corner.
For those that want to try it out, rear RC adjustments are more pronounced than front. Start off with no washers under the inner ballstud, reset your camber, and turn a few laps. You should notice more turn in, and more rotation though the corner (e.g. looser).
Now go back and add 2mm worth of spacers under the inner ballstud (this is a BIG change). You'll notice that now the car is more stable, and easier to drive, at least at RCHR.
http://users.telenet.be/elvo/3/3.html
^ lighter read than the "tune with camber links" thread.
12-30-2013 | 06:10 PM
^This
Roll Center is not the same as the Center of Gravity, and can be adjusted independently (for the most part).
The closer the RC is to the COG, the less the chassis will roll in a corner. This will make the car react more quickly, as you're not waiting for the car to actually roll before it starts changing direction. This lack of roll results in a car that will rotate more freely though a corner.
Lowering the inner ballstud height, e.b. shaving the rear brace on a B4, will raise the RC. This is an adjustment best suited for high traction, or tight, point-and-shoot style tracks.
I'm tired of typing, so raising the inner stud on a B4 will have the opposite effect. It will move the RC further away from the COG, resulting in increased chassis roll. This will tame down initial steering, but will put more weight on the outside wheels in the middle/exit of a corner.
For those that want to try it out, rear RC adjustments are more pronounced than front. Start off with no washers under the inner ballstud, reset your camber, and turn a few laps. You should notice more turn in, and more rotation though the corner (e.g. looser).
Now go back and add 2mm worth of spacers under the inner ballstud (this is a BIG change). You'll notice that now the car is more stable, and easier to drive, at least at RCHR.
http://users.telenet.be/elvo/3/3.html
^ lighter read than the "tune with camber links" thread.
Roll Center is not the same as the Center of Gravity, and can be adjusted independently (for the most part).
The closer the RC is to the COG, the less the chassis will roll in a corner. This will make the car react more quickly, as you're not waiting for the car to actually roll before it starts changing direction. This lack of roll results in a car that will rotate more freely though a corner.
Lowering the inner ballstud height, e.b. shaving the rear brace on a B4, will raise the RC. This is an adjustment best suited for high traction, or tight, point-and-shoot style tracks.
I'm tired of typing, so raising the inner stud on a B4 will have the opposite effect. It will move the RC further away from the COG, resulting in increased chassis roll. This will tame down initial steering, but will put more weight on the outside wheels in the middle/exit of a corner.
For those that want to try it out, rear RC adjustments are more pronounced than front. Start off with no washers under the inner ballstud, reset your camber, and turn a few laps. You should notice more turn in, and more rotation though the corner (e.g. looser).
Now go back and add 2mm worth of spacers under the inner ballstud (this is a BIG change). You'll notice that now the car is more stable, and easier to drive, at least at RCHR.
http://users.telenet.be/elvo/3/3.html
^ lighter read than the "tune with camber links" thread.
**edit** the 4th figure in Lamar's link seems to be painting a different picture here. There's an extra two lines (the green lines) that I did not consider - from the middle of the tires to the extrapolated intersection of the arms and camber links. If the arms are relatively flat (i.e., if that angle is less than the camber link angle), then raising the inner ball stud will drop the roll center. I stand corrected...
Last edited by stickboy007; 12-30-2013 at 08:08 PM.
12-31-2013 | 07:01 AM
Hope to see you on Thursday for some racing.
12-31-2013 | 07:57 AM
Tech Fanatic
iTrader: (11)
Joined: Nov 2011
Posts: 877
From: Connecticut
12-31-2013 | 04:18 PM
Happy New Year! Hope to see you all a week from tomorrow! Grove on this in the meantime!
http://www.youtube.com/watch?v=L8s9dmuAKvU
http://www.youtube.com/watch?v=L8s9dmuAKvU
01-01-2014 | 06:06 PM
I don't think it's gonna get you a B5 any faster, lol.
The snow will screw up my plans of racing 
What will the schedule be for the track for Fri and Sat?
What will the schedule be for the track for Fri and Sat?
01-02-2014 | 05:32 AM