A safety question
#61
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
The time delta when the car is crumpling and slowing and you are not slowing with it is time that you are not loosing energy but gaining energy delta between you and the car. you are in a way negating the crumple zone. it is soaking up energy and you are carrying on in motion rather than dumping energy into the crumpling car. At some point you do stop moving forward and then you have to deal with the grown speed delta between you and the car. Keep in mind in a wreck you don't hit the tire wall, the car does. You hit the car.
#63
The Penguin King
Rennlist Member
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
On seatbelt stretch from the Wellington Sears Handbook of Industrial Textiles:
#64
Mr. Excitement
Rennlist Member
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
^ IIRC from my reading this is for street systems. Look at how street belts systems now use pretensioners to take up slack and reduce movement even further. 3 point systems don't work at all like 6 points do. no you don't want to use steel cable for belting systems but you do want to keep things clean and lined up. De excel from body movement out of the containment system is unwanted.
OTOH please note the bit about "seatbelts should last the life of the car" too bad the makers of race belts can't figure that part out very well and force us to discard good belts every so often regardless of condition.
OTOH please note the bit about "seatbelts should last the life of the car" too bad the makers of race belts can't figure that part out very well and force us to discard good belts every so often regardless of condition.
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
#65
The Penguin King
Rennlist Member
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
^ IIRC from my reading this is for street systems. Look at how street belts systems now use pretensioners to take up slack and reduce movement even further. 3 point systems don't work at all like 6 points do. no you don't want to use steel cable for belting systems but you do want to keep things clean and lined up. De excel from body movement out of the containment system is unwanted.
OTOH please note the bit about "seatbelts should last the life of the car" too bad the makers of race belts can't figure that part out very well and force us to discard good belts every so often regardless of condition.![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
OTOH please note the bit about "seatbelts should last the life of the car" too bad the makers of race belts can't figure that part out very well and force us to discard good belts every so often regardless of condition.
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
I'm not sure we are saying particularly different things. My only point is that the containment system (seats, harness, HAN, side net, helmet...) has to give some in order to absorb some of the deceleration. If you were to consider the end-member case of nothing other than the crush zone of the vehicle having any give, a head-on collision with a barrier at speed (lets say >60mph) would result in forces to the brain that I suspect would be much more than we would want to experience. So some of the system has to absorb some of the deceleration.
Any more comments along these lines by me are likely to conjure up Kibort, so I better shut up now.
![Cheers](https://rennlist.com/forums/images/smilies/beerchug.gif)
#66
Burning Brakes
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
My comment was in regard to older designs which are not "see through". Some people have purchased those seats without realizing that the halo part needs to be cheek high, otherwise you are wearing blinders - i.e., can't see to the side. Newer designs are see through which eliminates that.
My problem is that I need to keep my car street legal and I can't figure out how to get a net to work.
My problem is that I need to keep my car street legal and I can't figure out how to get a net to work.
#67
Three Wheelin'
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
My comment was in regard to older designs which are not "see through". Some people have purchased those seats without realizing that the halo part needs to be cheek high, otherwise you are wearing blinders - i.e., can't see to the side. Newer designs are see through which eliminates that.
My problem is that I need to keep my car street legal and I can't figure out how to get a net to work.
My problem is that I need to keep my car street legal and I can't figure out how to get a net to work.
I bought a tow vehicle this summer and I'm on the hunt for a deal on an open trailer so I can hit some tracks further away. Take that for what its worth.
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
#68
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I found some guidance on installation criteria, including 2,000 lb loading on each anchor point based on Safety Solution.
Does anyone have any suggestions for a strong, but sanitary, installation of the front strap in the dash of a 996 GT3?
http://www.apexperformance.net/CartG...%20Install.pdf
Thanks
Does anyone have any suggestions for a strong, but sanitary, installation of the front strap in the dash of a 996 GT3?
http://www.apexperformance.net/CartG...%20Install.pdf
Thanks
#70
Racer
Join Date: Sep 2007
Location: Southwestern Ontario
Posts: 335
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
I am looking at a Kirkey seat right now. The one i am looking at (91 series) is designed to be mounted on floor mounted brackets. The back, however, will need to be secured to the cage under PCA (and most other racing organizations) rules by way of a back brace.
Kirkey does have a tubular mount that is welded to the roll cage as a type of cradle. That mount is apparently not for the 91 series seats.
Kirkey does have a tubular mount that is welded to the roll cage as a type of cradle. That mount is apparently not for the 91 series seats.
#71
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
While I've known I needed to switch to a halo seat for some time, this thread finally pushed me over. Speedsport is installing an OMP seat this week.
#73
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Picture this: 4 anchors on the typical floor anchors the base. Then you have structure like a back brace that is mounted to the seatback and the cage harness bar. That is the typical minimum. But that is really not adequate but acceptable by most "trackside tech." A better plan is to construct a floor mount system of DOM tubes at lesser diameter but like your roll cage. This mount is welded to your cage. This mount would have not only the 4 places for the seat to base to bolt to but also double shear anchors for the lapbelts and provision for mounting and guiding the sub belts up the seat hole(s). Coming off the harness bar would be more of these same smaller diameter bars to craddle the back of the seat and mount to it. That would give you a minimum of 2 more attachment points to the seat. Remember that a metal seat bends in a crash so it needs to be supported. Remember that he biggest advantage of a metal seat is that you can drill it and mount on it anywhere you want to support it from and you can cut weld on it too so you can do things like get the shoulder belt holes exactly where you need them.
#74
GT3 player par excellence
Lifetime Rennlist
Member
Lifetime Rennlist
Member
#75
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
So sorry to hear of the passing of a fellow driver.
I use a Halo Seat, HANS 3" into 2" into 3" Schroth shoulder harnesses, side window nest and soon a right side net.
I had a ISAAC H&N device I bought from a Rennlister. It is a little more difficult to get in and out of but ISAAC claims side impact protection. See: http://www.isaacdirect.com/
I bought it used on Rennlist and later sold it to another Rennlister. On paper, the ISAAC seems to be the best possible protection, but the device doesn't seem to have caught on.
I use a Halo Seat, HANS 3" into 2" into 3" Schroth shoulder harnesses, side window nest and soon a right side net.
I had a ISAAC H&N device I bought from a Rennlister. It is a little more difficult to get in and out of but ISAAC claims side impact protection. See: http://www.isaacdirect.com/
I bought it used on Rennlist and later sold it to another Rennlister. On paper, the ISAAC seems to be the best possible protection, but the device doesn't seem to have caught on.