Mayf, I was involved at Speedweek with two such cars---1/4" swedged cable or
1/4" rod or 1' x 1/4" flat material attached to frame with seperate mountings
was wat I was told was accecptable----wmts
>
> From: "DrMayf" <drmayf@teknett.com>
> Date: 2004/10/01 Fri AM 10:13:02 CDT
> To: <land-speed@Autox.Team.Net>, <wamlk@earthlink.net>
> Subject: Rule 3.S question
>
> I asked this question before regarding the trailing link arm on the rear
> suspension needing safety straps. I have resigned myself to doing this
> because it seems inherently safer to do so. However, the rule and
> description leave a lot to be desired. Here is the part I am in need of
> additional information on:
>
> "3.S ......................All traction bars and trailing links shall have
> a metal sling near the front attaching point with a minimum of 1/4"
> diameter. ............................"
>
> Questions
> 1. Does this mean that the sling has to be a rod? When it says diameter it
> must mean round because it uses the word SHALL..
> 2. What kind of metal? Chrome Moly, cold rolled steel, lead? Is there a
> specific tensile strength needed?
> 3. Can the sling be of equivalent cross section to 1/4 inch diameter area
> wise? For instance, a 1/4 inch diameter bar has a cross sectional area of
> 0.049 square inches. Could a flat bar with that equivalent area be used? IE
> 1/2 inch wide by 0.098 thick? Or 1/4 x 0.196?
> 4. What about attaching bolts or fasteners? To the link? To the frame?
> 5. Many of todays cars (Mustangs for one) use a four bar link
> arangement...do these OEM cars require a support for the bottom links? Or
> iis OEM Exempt? If OEM is exempt them what about aftermarket 4 link
> suspensins from Major Manufacturers such as Chassis Shop, Chassis Works, and
> Art Morrison? These puppies use 5/8 inch attaching bolts (grade 5) and 3/4
> inch heim fitings threadded into a 1 inch diameter link bar. And fasteners
> use nylock nuts.
>
> Bottom line: what is reasonable that I can and should do? Will it depend on
> the eyes of the inspector and change at every meet? In the area of safety,
> rules should be pretty specific, dont you think?
>
> Oh, and yes I have seen some ideas which do not meet the criteria specified
> but would certainly do the job. BUt if I was an inspector reading the book
> which says 1/4 inch DIAMETER, I would flunk every one who uses something
> different.
>
> mayf, out in pahrump...
>
>
"Sparky"
Lakester 2211
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