|
|
10-11-2011, 12:47 PM | #23 |
Major General
2759
Rep 5,484
Posts |
ISAAC is what I'm using right now, since 2005. It's popular amongst the dirt track crowd (I've heard they do lots of flips). I've had several hard hits, all of them offset to some degree from 30 to 90 degrees (because in the real world you're not on a crash sled) with no halo seat, and it's worked as advertised. I bought a halo seat for the car in my sig after my previous car was crashed too hard to rebuild economically and promptly stopped crashing, so maybe everybody should just buy a halo seat for that reason.
The ISAAC "shock absorbers" are there partially for decel but mostly to provide head mobility, and once they're extended they act just like tethers but without the give in the webbing, relying on the give in the harness webbing to slow the decel. The full containment seats work great in a front or front-offset impact but as soon as the acceleration vector is pointed away from the backrest they start to lose effectiveness. That's where the HNR is supposed to take up the slack in the modern safety system scheme, and where IMO the HANS is pretty well useless compared to better designs that weren't written into the SFI 38.1 spec. Not a big deal and I'll probably buy a HANS anyway since my SRF only allows my head to move sideways about 3" on either side, but it's something to think about.
__________________
Last edited by Richbot; 10-11-2011 at 02:32 PM.. |
Appreciate
0
|
10-13-2011, 07:16 AM | #24 |
Major General
374
Rep 8,033
Posts |
Thanks for the info. I've heard about ISAAC, but never seen one person. Are the connecting pieces solid links with ball joints at the ends that are connected by the damper in the middle? If so, then I can see how the damper provides mobility when expansion/compression speeds are low.
They reference a SAE paper on their website, and there is footage from 30 degree crash tests (as compared to HANS). HANS comes loose as criticized. I slowed it down and watch it, and it is indeed clear that a Halo extension would not change the outcome in that scenario since it comes out of the harness when the neck would just about clear the extension as the body moves forward. Although they don't reference the peak deceleration rate for that test (maybe the SAE paper does), they say it is meant to mimic a stock car crashing into the wall. One can argue the forces in crashes involving lower power/grip cars might be lower in general, but one can always find a way to put anything into a barrier/wall/tree that would yield high/comparable gs. The lateral sheer data are also interesting. I'll get a hold of the paper. http://www.isaacdirect.com/
__________________
|
Appreciate
0
|
03-31-2013, 12:50 PM | #25 |
Major
188
Rep 1,153
Posts |
As I would like to get one of these and have some questions, I need to revive this thread.
Can anybody tell me what the "sliding tethers" and "contoured vs. straight" options are when placing an order? Thanks.
__________________
2019 M2C MT (ED + PCD) | 2008 M3 Coupé MT | 1995 M3 LTW MT | BMW CCA HPDE Instructor
|
Appreciate
0
|
03-31-2013, 06:46 PM | #26 | |
Lieutenant Colonel
81
Rep 1,510
Posts |
Quote:
Don't forget to order the correct nutwashers for your helmet. Using the HANS tethers is also an option but you can plan for that later on. |
|
Appreciate
0
|
04-01-2013, 10:01 AM | #27 | |
Major
188
Rep 1,153
Posts |
Quote:
After further discussion with the Simpson rep., I opted for the straight version which will be a better fit for my regular seat. Contoured seems to be designed for seats which are really tilted backwards, such as in Drag Racing.
__________________
2019 M2C MT (ED + PCD) | 2008 M3 Coupé MT | 1995 M3 LTW MT | BMW CCA HPDE Instructor
|
|
Appreciate
0
|
04-01-2013, 11:52 AM | #28 | |
Lieutenant Colonel
81
Rep 1,510
Posts |
Quote:
Also..just fyi, a lot of people don't use the foam insert but if you don't you'll ruin your regular seats. I've added a thin layer behind their foam insert and that solves the problem, you'll see what I'm talking about when you get the R3. GL! |
|
Appreciate
0
|
04-04-2013, 10:51 AM | #29 |
Major General
1570
Rep 8,075
Posts
Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Houston, TX
|
The link is broken...are we talking about the hybrid pro? Kind of like the necksgen?
__________________
2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue |
Appreciate
0
|
04-04-2013, 01:04 PM | #31 |
Major
188
Rep 1,153
Posts |
Yup, the R3 from Simpson (which is now distributing the Safety Solution products): http://simpsonraceproducts.com/head-neck/r3.html
__________________
2019 M2C MT (ED + PCD) | 2008 M3 Coupé MT | 1995 M3 LTW MT | BMW CCA HPDE Instructor
|
Appreciate
0
|
04-04-2013, 02:38 PM | #32 |
Major General
1570
Rep 8,075
Posts
Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Houston, TX
|
Hmm...never seen that one. I might have to see where I can try one. I wear a HANS but now that I'm instructing I want something that I can wear in a student's car.
__________________
2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|