http://www.isaacdirect.com/htm....html

Download the HW@CMP2007 video under the Side Impacts section.

I worked with Gregg Baker at Isaac to get him some crash data (using the AIM's internal lateral G sensor)* and incar footage from my unfortunate off at CMP back in April. The guys at Isaac are top notch! After the incident my neck wasn't stiff, sore, anything! Not even the morning after!

I wish Gregg would have posted up the rest of the lap... this really makes me look like a horrible driver as I lifted going into the kink to scrub off some of my mad speed, however once I hit the hump, I was back into it full throttle as you can hear. I have a new respect for that turn! Car only suffered left side sheet metal wrinklage, tweaked LR trailing arm that has been replaced, and a fresh 4 wheel alignment.

*For those interested in the AIM data system currently on the car, it is decent, but I must plug MoTeC products as they are far superior data acquisition tools!


Modified by Hunter at 9:54 AM 8/8/2007

 

Damn, dude! Your head doesn't move at all in that video though, that's really interesting. Which Isaac was this?

 

so that's the 2nd or 3rd car you have wrecked at cmp???

glad you were ohkay dude....you moved those tire 10-16 feet....

 

I believe it is the intermediate isaac system, quick release pins.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">so that's the 2nd or 3rd car you have wrecked at cmp???

glad you were ohkay dude....you moved those tire 10-16 feet....</TD></TR></TABLE>

1st! your car just kissed the tires!

 

U think it looked impressive from inside the car u should have been outside watching and saying to yourself don't hit anything PLEASE

 

another check in the Isaac column. glad to see you didn't get hurt.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hunter &raquo;</TD></TR><TR><TD CLASS="quote">http://www.isaacdirect.com/htm....html

Download the HW@CMP2007 video under the Side Impacts section. Rated R! </TD></TR></TABLE>
We cleaned it up, Hunter. It is now Disney safe.

 

dern b0'

hunter glad you are OK.

got any pics from the outside to see the damage?

yeah, you barely moved in the car. it seems liked you didnt even feel it

 

ouch dude. i'm gald you're okay.

 

Um, that's my car dude. Don't ever wreck it again, ok?

Glad you were okay though and yeah, the Isaac is great.

P.S. You can floor it through there (in that car) and had a good line until you lifted

 

he lifted on purpose... he was testing out the equipment

 

Troo...

I should clarify. I wouldn't recommend flooring it through there in an H1 car in the rain, however. I've tried. It doesn't work

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Back in Black &raquo;</TD></TR><TR><TD CLASS="quote">Um, that's my car dude. Don't ever wreck it again, ok?

Glad you were okay though and yeah, the Isaac is great.

P.S. You can floor it through there (in that car) and had a good line until you lifted </TD></TR></TABLE>

Yep 2x.......hope to see Hunter in Sept.

 

That was a fast section you went off. Good god for the tire barrier.

Good advertisement attempt on Isaac.

However, after Kubica crash, I doubt anyone can compete with HANS real life test there. What was it? Over 100G and no after effect the next day? Not even a sore neck. Only a sprain ankle.

 

IIRC, the BMW engineers had Kubica at 35Gs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Back in Black &raquo;</TD></TR><TR><TD CLASS="quote">
P.S. You can floor it through there (in that car) and had a good line until you lifted </TD></TR></TABLE>

Yea, the first two sessions of the day I was through there flat. (When I was nibbling at your lap record!) That was w/o the front splitter. W/ the front splitter, the rear end was WAY loose through there. The laps before that (one was flat foot) I had to chase the rear end literally the entire way through the turn (*PUCKER*) so I had started to lift going in to scrub some speed. Should have made the engineering decision to NOT run a splitter at this track altho it really helped turn in everywhere else!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Back in Black &raquo;</TD></TR><TR><TD CLASS="quote">Troo...

I should clarify. I wouldn't recommend flooring it through there in an H1 car in the rain, however. I've tried. It doesn't work </TD></TR></TABLE>

What do you mean?

 

Hmm, I was just reading Racer mag today and it mentioned 75G...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by parislohan &raquo;</TD></TR><TR><TD CLASS="quote">Hmm, I was just reading Racer mag today and it mentioned 75G...</TD></TR></TABLE>That was probably total resultant Gs, most of which was lateral. IIRC, the frontal was 28-35.

 

I'm recalling the number base on memory, I might be wrong.

But the initial collision with the K-wall is almost head on. The angle of impact can't be more than 30 degree deviation from perpendicular.

I would think the total resultant is mostly straight on.

Regardless, if the vector is mostly lateral it is even more impressive for HANS, since the side protection on the cockpit flew off in the inital impact. One can only conclude that the HANS protects side impact as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gsbaker &raquo;</TD></TR><TR><TD CLASS="quote">IIRC, the BMW engineers had Kubica at 35Gs.</TD></TR></TABLE>

However many g's kubica pulled that was a vicious crash I don't anyone can argue with that. Not to mention when hans devices first started becoming mandatory they recorded 114g crash in an indy car i believe where the guy walked away without any soreness at all.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Justin3 &raquo;</TD></TR><TR><TD CLASS="quote">...Not to mention when hans devices first started becoming mandatory they recorded 114g crash in an indy car i believe where the guy walked away without any soreness at all. </TD></TR></TABLE>IRL drivers have crashed at over 130Gs with a HANS device w/ only minor injuries, but that doesn't tell you anything absent the load vector and pulse duration.

A short 130G pulse in the Z axis with a 60 degree reclined seat is a yawn for any head and neck restraint--because it will not be loaded.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Andrie Hartanto &raquo;</TD></TR><TR><TD CLASS="quote">But the initial collision with the K-wall is almost head on. The angle of impact can't be more than 30 degree deviation from perpendicular.

I would think the total resultant is mostly straight on.</TD></TR></TABLE>Look for overhead images. They will show a glancing blow about 60 degrees off frontal, if not more. That's where the 35 vs 70 debate comes in: 70Gs * sin(30) = 35 frontal, which the BMW engineers reported.

It was a very dramatic crash--especially with the suspension parts exploding--but you can create those driver loads all day long on a crash sled at half speed.

 

Gregg,

Is the Z axis the axis along the spine of the driver or the vertical direction that's perpendicular to the direction of the traveling vehicle?

Thanks,
Andrew

 

Andrew,

The Z axis is vertical with respect to the direction of the traveling vehicle, not the driver's body. The IRL seat back is 60 degrees off vertical (30 degrees off horizontal), so the driver is almost lying down. The 130G event I referenced had a large Z component, so it was like the car was being dropped. There were other load components, of course (X & Y axes), that would load the H&N restraint, but not to 130Gs.

That said, any good H&N restraint would have worked fine.