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Old 07-02-2007, 11:52 AM   #1
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Default Sus Arm Length

MTX-3, 705, V-one-R etc on.. had short sus arm length.

But.. now.. MTX-4, 720, RRR, NT1 etc on.. had long sus arm length.

i wonder what difference of sus arm length..

1) front sus arm length effect (short/long)
1) rear sus arm length effect (short/long)
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Old 07-03-2007, 11:05 AM   #2
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is my question too difficult? or can not understand my question?

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Old 07-03-2007, 11:18 AM   #3
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Quote:
Originally Posted by gansei View Post
MTX-3, 705, V-one-R etc on.. had short sus arm length.

But.. now.. MTX-4, 720, RRR, NT1 etc on.. had long sus arm length.

i wonder what difference of sus arm length..

1) front sus arm length effect (short/long)
1) rear sus arm length effect (short/long)
You might try asking this in the electric forum. The electric guys are a bit more concerned with suspension geometry and its effects on handling. There are probably some general guidelines for longer vs shorter arms, but there are so many other variables that combine with them to make the geometry work. I'm not sure that there is a "best" arm length though.
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Old 07-03-2007, 11:48 AM   #4
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You might try asking this in the electric forum. The electric guys are a bit more concerned with suspension geometry and its effects on handling. There are probably some general guidelines for longer vs shorter arms, but there are so many other variables that combine with them to make the geometry work. I'm not sure that there is a "best" arm length though.
oh.. i see.. thanks a lot!!

i will ask this question to Much-More Driver.
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Old 07-03-2007, 11:53 AM   #5
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The theory behind longer or shorter arms is basically where the chassis pivots on the axis. I don't think there is a right or wrong length, each car's geometry is just built around what they have and I believe this is usually built to be as long as possible with the smallest bulkheads possible.

That being said, supposedly longer arms allow the suspension to do more of the work than the chassis itself but it's still an overall package.
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Old 07-03-2007, 03:45 PM   #6
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is my question too difficult? or can not understand my question?

The camber gain is controlled by the unequal length of the suspension arms. The goal is to manage tire contact patch. The unequal length will allow you to tune the contact patch accordingly. It isn't about static camber - camber is variable - if you manage to get the contact patch working in conjunction with the traction requirement at a given deflection - you win - if not, well, you lose.

Or, you could ask the dust busters if you like.
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Old 07-03-2007, 05:05 PM   #7
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When Team Magic came out with their revised suspension arms for the G4+, they made the rear lower arm length adjustable as shown in the first photo below. The arms seem to have been designed this way, to compensate for the fact that there are only two inner camber link positions - the stock position and one that is up and inward. In order to get a longer camber link, you have to move the rear lower arm position to the inner hole. As you can see from the second photo, the inner camber link positions are incorporated into the rear shock tower mount versus something extreme like the camber plate that is available for the RRR as shown in the third photo below.

It's really interesting to compare what each manufacturer has provided as options for adjusting the inner camber link position and addressing camber gain.





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Old 07-03-2007, 06:10 PM   #8
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I think you might wan't to read extensively this theory handbook on RC Car Handling http://home.scarlet.be/~be067749/58/

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Old 07-03-2007, 06:51 PM   #9
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Originally Posted by afm View Post
I think you might wan't to read extensively this theory handbook on RC Car Handling http://home.scarlet.be/~be067749/58/

AFM
You always have the best info and links Alfonso. When are we going to see the AFM KB Web site??
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