• From: College Station, Texas
  • Registered: 2009-07-11
  • Posts: 1,137

Re: S & W Race cars Lemons cage install.

mike944 wrote:

I I thought i had seen harnesses mounted like that in wrc rally cars, which i assumed were fia spec which i assumed would fly

http://img102.imageshack.us/img102/1056/05focus9it1.jpg

http://farm2.static.flickr.com/1226/510 … 29545b.jpg

I am curious why this isn't valid for Lemons also.  It is valid in other professional series and the belt manufacturer make the belts long enough to attach this way. The reason I hear is "too much length leads to shock".  Since these are non elastic and the they are taunt, why would this be?

the Syndicate - 30 losses and counting ...
89 VW Jettarosa - #337 (11 motors later) <> 67 Mercedes 200 - #200, winner "most with the least" MSR Feb 11, IOE at MSR June 11 <> 88 Mercedes 560 SEL <> 76 Mercedes SLC - IOE at ECR March 13 <> now pimping performance parts for 1970-1980's Mercedes SEL, SEC, SL, SLC's
  • From: Boulder, CO
  • Registered: 2010-11-12
  • Posts: 602

Re: S & W Race cars Lemons cage install.

Jackasic wrote:

I am curious why this isn't valid for Lemons also.  It is valid in other professional series and the belt manufacturer make the belts long enough to attach this way. The reason I hear is "too much length leads to shock".  Since these are non elastic and the they are taunt, why would this be?

Everything stretches/deforms with enough force.  Racing belts stretch up to 20% of their length during a collision.  So the longer you make them, the farther they'll stretch.

-Victor
  • From: Philadelphia
  • Registered: 2010-12-11
  • Posts: 176

Re: S & W Race cars Lemons cage install.

Its not Lemons legal because thats the way Lemons wrote the rule which is what I'm going with! smile

As for webbing stretch,  I was unable to find what SFI 16.1 actually meant, I don't know what the specs are on sfi 16.1 webbing. My guess is the webbing is static, not dynamic and would stretch less than 10%. who knows, I couldn't find hard numbers when I looked, so I could be way off.

Everybody does it different.

2011 FIA WRC rules are here..  http://argent.fia.com/web/fia-public.ns … 3_2011.pdf

The belts can be cage mounted here is the diagram and wording

http://lh3.ggpht.com/_8JLkLuerD-4/TUXlZOBhzpI/AAAAAAAAAcI/9P1KGapU49A/s800/Screen%20shot%202011-01-30%20at%205.22.48%20PM.jpg

The rally america rules state the belts should be mounted as close as practical, and their cage doesn't stipulate a harness bar in the main hoop. but then again they say all new construction should conform to current FIA. Different rules for different series.

http://www.rally-america.com/info/2008_Rollcage.pdf

https://www.facebook.com/TeamDeathrace

This ain't a parade folks, it's a race.

lamented's Website

  • From: Boulder, CO
  • Registered: 2010-11-12
  • Posts: 602

Re: S & W Race cars Lemons cage install.

lamented wrote:

IAs for webbing stretch,  I was unable to find what SFI 16.1 actually meant, I don't know what the specs are on sfi 16.1 webbing. My guess is the webbing is static, not dynamic and would stretch less than 10%. who knows, I couldn't find hard numbers when I looked, so I could be way off.

SFI 16.1:

6.1.1 BREAKING STRENGTH AND ELONGATION - WEBBING (CROSS
STRAP OPTIONAL)
The elongation of the Lap/Shoulder Belt webbing sample(s) measured at
2,500 lbs. (11.1kN) and of the Anti-Submarine Belt webbing sample(s)
measured at 1,500 lbs. (6.7kN) must be 5% to 20%. No elongation values
are required for the optional cross strap.

-Victor

30 Reply by lamented (edited by lamented 2011-01-30 07:11 PM)

  • From: Philadelphia
  • Registered: 2010-12-11
  • Posts: 176

Re: S & W Race cars Lemons cage install.

6.1.1 BREAKING STRENGTH AND ELONGATION - WEBBING (CROSS
STRAP OPTIONAL)
The elongation of the Lap/Shoulder Belt webbing sample(s) measured at
2,500 lbs. (11.1kN) and of the Anti-Submarine Belt webbing sample(s)
measured at 1,500 lbs. (6.7kN) must be 5% to 20%. No elongation values
are required for the optional cross strap.

There ya go! Thanks Sublimate, it could be 10%   lol.   

Im surprised they allow 5 - 20. thats a big range.

5 would be static, 20 would be dynamic in most people arresting applications.


Where did you find the specs?

https://www.facebook.com/TeamDeathrace

This ain't a parade folks, it's a race.

lamented's Website