top

Harnes shoulder straps - crossed or uncrossed?

Post new topic Reply to topic trackscotland.co.uk Forum Index | Technical    Page 1 of 1

Fri Oct 30, 2015 11:23 am PostPost subject: Harnes shoulder straps - crossed or uncrossed?
Merlin
established user


Joined: 12 Oct 2010
Posts: 1173
Location: East Lothian

Reply with quote

Should the shoulder straps of your harness be crossed or uncrossed behind the seat? I originally had them crossed but one of the more junior scrutineers told me to uncross them. Today I have seen documentation that says they should be crossed.



http://www.schroth.com/installation-instructions/en/03_anchorage_locations_and_geometries.htm


Any ideas?
_________________
Maroon 1993 Honda Prelude - Crystal Blue 2000 Honda Prelude
Back to top
View user's profile Send private message
 
Fri Oct 30, 2015 11:33 am PostPost subject:
AK
Site Admin


Joined: 27 Nov 2006
Posts: 19008
Location: Aberdeen

Reply with quote

I think crossed with HANS... but ours are uncrossed and never been picked up for it.
_________________
Impreza Race Car - SLS/SMRC
Mini Race Car - SMRC
911 - 1981 Air Cooled 3.0
500 - 1969 Fiat 500 L
Toureg 262 RLine
Track Scotland
Back to top
View user's profile Send private message
 
Fri Oct 30, 2015 11:57 am PostPost subject:
HummuH
SMRC S&S Rep


Joined: 05 Jan 2012
Posts: 2293
Location: Sniffing petrol

Reply with quote

Think you're only meant to cross them with HANS when the fixing point is further back towards the rear of the car i.e. bar between rear struts on cage. If it's close to the seat i.e. the 8" they recommend then you do not cross them.
_________________
MD Racing
SMRC Sports & Saloons Facebook Page
Back to top
View user's profile Send private message
 
Fri Oct 30, 2015 2:58 pm PostPost subject:
David Long
established user


Joined: 15 Mar 2009
Posts: 686
Location: Cumbernauld

Reply with quote

My reading of it the HANS guidelines was that the angle is the important thing, and as the fixing points move back they may need to cross.
_________________
R400 Durabang
PB @ KH
Duratec in Detail
Back to top
View user's profile Send private message Visit poster's website
 
Mon Nov 02, 2015 12:26 pm PostPost subject: Re: Harnes shoulder straps - crossed or uncrossed?
scottish scrutineer
established user


Joined: 27 Mar 2013
Posts: 500

Reply with quote

Merlin wrote:
Should the shoulder straps of your harness be crossed or uncrossed behind the seat? I originally had them crossed but one of the more junior scrutineers told me to uncross them. Today I have seen documentation that says they should be crossed.

Any ideas?


As You'll be running HANS next season, consider these points
    Make sure the straps converge as shown in your diagram. This stops the harness slipping off the yoke of the HANS.

    Keep the strap length as short as possible as that reduces the potential stretch distance in an impact.

    Follow the guidance that will be provided with the HANS

_________________
Renny
MSA Scrutineer
Back to top
View user's profile Send private message
 
Mon Nov 02, 2015 10:01 pm PostPost subject:
UncleF
user


Joined: 05 Sep 2015
Posts: 96

Reply with quote

I know I'm a total Noob, and can't offer anything technically..

But my interpretation of the following statement in the above linked guidance was that the crossing of the harnesses was independant of the restraint devices being used, and only a function of the distance from the seat back to the fixing position. I could well be incorrect, just my interpretation of the following excerpt on the bottom of page 12...I believe it just informs the user that this is even more vital when using a HANS - rather than it only applies when using a HANS - again I could be very well wrong in this.


"For the best restraint of the occupant’s upper torso, ideal anchor points should not be further back than 200 mm [8”] from back of user’s seat.
In the event that the anchor points are further towards the rear of the vehicle [e.g. using a roll cage bar for wrap around attachment] the distance between the strap anchor points will narrow or even cross over as described in following graphs and tables.
· It is especially crucial to follow this strap routing when HANS® is in use."

This is what I ended up doing....

Back to top
View user's profile Send private message
 
Post new topic Reply to topic trackscotland.co.uk Forum Index | Technical    Page 1 of 1

View previous topic
View next topic
Display posts from previous:   




You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum