A lot of comments have been essentially "where is the data", "what are the G
forces", etc. If you go to the Isaac site http://www.isaacdirect.com
<http://www.isaacdirect.com/> and follow some of the links and watch the
videos you will get a lot of answers. There is even a power point
presentation of an SAE paper. The slides clearly show the forces for various
devices in a 30 degree, 50 G sled test. If you read some of the racer
testimonials you will get real world feedback. You can download an SAE
paper ($14.00) that consolidates much sled and crash test data from many and
various sources. There is not a lack of information as so far been
suggested.
>From the Isaac site:
Extensive comparative testing was conducted during the summer of 2002 and
the summer and fall of 2005, the results of which were presented at the
SAE's Motor Sports Engineering Conference in December 2006 and are available
as an SAE technical paper (Paper number 2006-01-3631). Also available is the
SAE technical paper titled "The Use of Dashpots in the Prevention of Basilar
Skull Fractures" (Paper number 2002-01-3306), which describes the
development of the IsaacR head and neck system. These papers can be
downloaded from the SAE web site for a modest copyright charge.
The SAE paper abstract says. . . "Unpublished testing using the same
protocol was conducted on the Wright Pro Harness design and the White Device
in 2002, and two variations of the Isaac sR design in 2005. Additional
testing was conducted on the White Device, two Isaac sR designs and the HANS
sR device using a protocol of 30 degree offset, 43.5 mph (70 kph) velocity
change and a nominal 68G acceleration."
Here is the link to purchase the paper.
http://www.sae.org/servlets/productDetail?PROD_TYP=PAPER
<http://www.sae.org/servlets/productDetail?PROD_TYP=PAPER&PROD_CD=2006-01-36
31> &PROD_CD=2006-01-3631
-Elon
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