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Old 02-05-2008, 09:36 PM   #1
Pezz_gs OP
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Leading Link Designs - Post Pics

Well this should create some responses . . . .

I am in the process of designing a set of Leading Links for a R series frame.
I have so many pics which I have collected for inspiration.

Lots of Different solutions to the problems that can arise.
Name:  DRz 400 LH leading link.jpg
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I like this design from an offroad DRZ400 from South Australia.

Things to consider is what type of tube to use.
Seamless Steam Pipe or Crome Moly?
Then tube dimensions and wall thickness.
The leading swingarm can be either straight or bent as above?

I will keep posting images and if you have any please post and details and thoughts.
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Old 02-05-2008, 09:37 PM   #2
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Name:  3wheeler-links (Medium).JPG
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Old 02-05-2008, 09:39 PM   #3
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Laverda.
Name:  6laverda-motor-links-480.JPG
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Old 02-05-2008, 09:40 PM   #4
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Old 02-05-2008, 09:41 PM   #5
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Old 02-05-2008, 09:43 PM   #6
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Old 02-06-2008, 08:35 PM   #7
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Quote:
Originally Posted by Pezz_gs

Just double checking- this is a DRZ400?!
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Old 02-06-2008, 09:07 PM   #8
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Here's a better view of my frontend as it was a couple of years ago. Since then I've pushed the axle forward 2.5cm, and removed the extra fender mount that pivots at the swingarm pivot point. Now the fender is completely supported by a bracket off the back loop on the swingarm. Notice the two mounting positions for the swingarm pivot. For racing the pivot can be moved to the rear position for better handling in deep sand conditions.
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Old 02-06-2008, 09:35 PM   #9
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Quote:
Originally Posted by Uncle Ernie
Just double checking- this is a DRZ400?!
Yes! look at the ducktail on the bike '400'
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Old 03-07-2008, 11:38 AM   #10
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Another...

This one isn't nearly as elaborate as some of the others posted, but it's the suspension that Dauntless built for the Tiger Rig that I now own.
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Old 03-07-2008, 06:40 PM   #11
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OEC-Temple


OEC-Temple Duplex Forks


Quote:
. . . a simple diagram which shows the geometry of the system, so you can have an idea of how it works. Having ridden many miles on these machines, I can testify to how well it all works, although the worst feature is its large turning circle and poor manoeuvrability at slow speed and when wheeling the machine about. I did also have a frontal collision some years ago with the rear end of a Jeep which stopped suddenly without warning, which demonstrated the excellent impact absorbing properties of the machine!!! The damage looked far worse than it was, as I simply popped the bottom links out and more or less rode home...


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Old 03-07-2008, 10:52 PM   #12
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Originally Posted by vortexau

OEC-Temple Duplex Forks

And now you all know why the O.E.C. company was affectionately referred to as:

"Odd Engineering Concepts"

Actually, this front end (one rather hesitates to call it a 'fork') was delightfully solid and stable at a time when most front forks were allowed to simply wave about loosely in the breeze, with tank-slapping and high-speed oscillations considered the norm, not the unusual.

It's weakness were the multiple bushings that defined the parallelogram which suspended the wheel - they had to be tight to prevent play, but loose enough to allow the headstock to turn easily - any dirt, grit, or misalignment and the bike reverted to classic 'Arm-Strong' steering.

Also, wheel turning angles were somewhat less than conventional forks - constrained not so much by design, but by the lever arm's strength - they're subjected to significant compression and bending forces.

Still, it's interesting to consider this front end being built with modern teflon-lined bushings (or even heim joints), and high-tensile rods. It should be no more difficult than a LL or TL design, and a delight to ride on a sidecar rig.

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Old 03-10-2008, 06:09 AM   #13
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Still on that O.E.C. Duplex . .

The strange thing is that I penned a diagram of a off-setting trike frontend some fifteen years back, similar to this O.E.C. Duplex, before I had laid eyes on the O.E.C.

My version had larger-scale geometry that would have moved the trike front-wheel to the outside during cornering . . . imitating a racecar that lifts the inside front to corner on three wheels.

Scaling a OEC-type could produce a sidecar machine that moves the frontend outboard when the chair is on the inside of the turn --- effectively widening the track to place the CG further inboard.

The same displacement of the frontend chairward, when cornering with the chair on the outside of the turn, would allow the frontend to offload some of the mass-transfer to the chairwheel; reducing chairwheel suspension compression.

That O.E.C. (in the picture) seems to use a plunger-style suspension, but I can see this geometry being used with upper & lower swingarms to make a "hub-centre" that has no actual centre steering axis. This concept would still require a wishbone-link to handlebar.
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Old 03-21-2010, 08:06 PM   #14
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