Topic: Parabollic Leafs

[Jeffy]

Someone on another forums asked a question about this. They are in the UK and asked if we have them here.  Interesting design actually.  Looks sorta like a multi-pack monoleaf.  Basically they remove friction from the individual leafs by seperating them by a lot.  Then using only full length leafs so it retains the softer ride.  I kinda like the idea.  Strength of a multi-pack while is flexability of a monoleaf.

http://www.parabolicsuspension.com/index.htm

More comfort with the same or better load capacity?

 Yes, with a TIC Parabolic suspension system you will have a smoother, more comfortable ride in combination with a higher spring rate to alow the extra ride height or load capacity you need. How is this possible? Well, the answer is simple and it can be found in the design of the spring itself (see below). Due to the lack of interleaf friction the spring will flex better and quicker then it's convesional counterpart, so it's dynamic characteristic will resemble closely that of a coil spring. This aspect will ensure the comfortable ride you need but this also it will allow a higher rate without compromising the ride comfort. The parabolic design will also alow higher stresses and loads without sagging or breaking.
These two points (and others) make our TIC Parabolic suspension system more advanced than any other multi-leaf spring systems currently available on the market.
           
          What is a parabolic spring?

Basically the parabolic spring is a spring that consists of two or more leaves. The leaves touch only in the middle, where they are fixed to the axle and at the outer ends, where they are fixed to the vehicle. In between those two points the leaves do not touch each other as they do with conventional leaf springs. Each leaf represents a complete spring in it's self and will act as such. To enable this the leaf is tapered, from the center (thick) to the outer ends (thin). This tapering is parabolic, it means that every centimeter (or inch) the thickness of the leaf decreases in an amount that relates to the square function of it's length.
         
 
 Above: Tapering in an "ideal" mono leaf spring. You can see that one leaf has a similar shape as a multi-leaf spring.
Below: You can see the tapering in the leaves of the spring. The leaves taper from the center till the end (eye) and are separated by distance blocs to prevent contact.          
This may sound complicated but in fact it is very simple. Every single leaf will have, more or less, the shape of a complete multi leaf spring and thus it's capable to cope with the same forces. This means that the ideal parabolic spring could have only one leaf, however, this type of "mono leaf" spring will have very limited articulation due to high internal stresses so a 2 or 3 leaf parabolic spring can devide the stresses more evenly across the other leaves and thus more axle movement is possible. That is why we designed 2 and 3 leaf springs. An other reason to increase the number of leaves on a parabolic spring is to increase the rate (load capacity). Because every leaf is one spring we can ad or take out leaves without compromising the strength of the leaf it self. So for example we have a 3 leaf rear spring and we ad one similar leaf the rate will go up for about 30% which means that the load capacity increases by +/- 30% (depending on the shackle effect)

[trailerrails]

Very interesting.

[jackhammer]

I emailed the company and they responded .  They have a 2.5 lift spring for my YJ and it is 400 euro dollars.  Does anybody have a current conversion rate. Oh yea plus shipping I think fed ex from freaking europe. It comes with new shackle mount bushings.  Does anyone know what that would come out to.

[Jeffy]

$476.20, figure $100 to ship it on a boat.

[jackhammer]

would that be plus shipping or after shipping total 476

[Jeffy]

Before shipping since I have no clue what shipping would be.

I'd imagine $1-200 and it would be put on a slow boat.

[jeepboy21]

i contacted the company to inquire about shipping.  here is the email i sent them:

Hello, I am very interested in your Jeep Wrangler YJ suspension lift.  I am
from the states, Oregon to be exact.  I was wondering if you could let me
know what if any complications I might have ordering from you and getting
the product here.  What would shipping be to Portland, OR 97231?  Also about
how long would shipping take to get to the same location?

Thank you,

Jared

this was their response:

Hello Jared,
Thank you for your e-mail. I can ship to your address without any problem.
With FedEx it will take 1 or 2 days to get to you.
The spring kit (4 springs incl. bushes) weighs 45 Kg and costs Eur 400,-
Shipping costs are Eur 198,-

If you have any questions please contact me.

Regards,

Paul Heijstee

TIC Parabolic Suspension Systems
De Roysloot 8c (De Klei - Oost)
2231 NZ Rijnsburg
The Netherlands

Tel: +31 (0)71 517 00 67
fax: +31 (0)71 408 16 39
mob: +31 (0)6 53 504 557


the shipping time seems to be a little off.  i like the idea of these lift springs but i think i'd need to know a little more about the company b4 i spend about $730. for that i could get and OME suspsenion.

[Jeffy]

Well, even though it's a lot, I'd be almost inclined to buy it.