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Author Topic:   Jacobs Ladder
kong
Dirt Full Roller

Total posts: 40
posted December 20, 2000 03:01 AM  
This question actually deals with a micro sprint I recently purchased. What are the benefits of a Jacobs ladder verses a panhard bar? This car has the ladder but has the mounts for a panhard bar. Thanks.

RacerEd2
Dirt Newbie

Total posts: 1
posted July 13, 2004 09:29 PM  
A panhard rod can be adjusted by the driver on the track if there is a lever setup, and a panhard rod has infinite adjustability. A jacobs ladder usually has two or three different settings. I currently am running a jacobs ladder and usually don't mess with it as there are other adjustments I can make first. Hope this helps...

quote:
Originally posted by kong:
This question actually deals with a micro sprint I recently purchased. What are the benefits of a Jacobs ladder verses a panhard bar? This car has the ladder but has the mounts for a panhard bar. Thanks.


rocket36
Dirt Freak

Total posts: 209
posted July 15, 2004 08:11 PM  
the roll centre, located by a jacobs ladder is very dynamic during movement particularly up and down, and the speed at which it moves can be altered by changing the lengths of the arms.
a j-bar can produce load by the "pole vault" effect

fastow
Dirt Maniac

Total posts: 168
posted July 15, 2004 10:17 PM  
Rocket where did you find this info I have allways wondered how the roll center was located and how it moved just never found anything on it but I have never done much with sprint racing I am suprised someone hasn't played with it on the mods or late models seems there everyones tring something different.

rocket36
Dirt Freak

Total posts: 209
posted July 16, 2004 03:25 AM  
i read an explanation and drawing in the OLD steve smith sprintcar book.
i think from memory the roll centre moves in an arc upwards as the chassis tilts into the corner due to the aero effect.
a buddy of mine played with the links on a jacobs ladder on his midget, thats kinda what led me to it.
i've seen a dirt late model run a full sprint rear end (standard arm, torsion bar, live axle, jacobs ladder) setup. the car was reasonably quick and very consistant, but a good 4-bar/j-bar deal proved faster most of the time (but not all the time). i think the advantage of the j-bar on a late model is the leverage effect for side bite, but that of coarse is not a major issue with a sprint car with a wing.

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