cooleyjb

FIA regulations for HANS in case anyone was interested.

http://www.fiainstitute.com/documents/HANS_Guide.pdf

ltc

A few random comments:

1. Both HANS and ISAAC have to obey Sir Isaac Newton's laws. They of course do, in very different ways.
Simple college physics can demonstrate the (vast) differences in loading between a simple tethered mass (HANS).....think a bullwhip.....and a damper connected mass (ISAAC). There is a mathematical elegance in using a damper to control the motion of a fixed mass....really.

2. I don't recall anyone from H&D ever posting in this forum, even after email invitations to please do so.

3. HANS does not have any (real) direct competitors. They have seen to that via their marketing plan; that is the business (non technical) side of safety. There is something 'odd' about a single device being exclusively specified by major sanctioning bodies (the same does not appear to be the case with harnesses, seats, nets, helmets.....but it is with H&N restraints)

4. I own several H&N restraints, HANS and ISAAC included, since I have a bit of a fascination in trying them and understanding their design philosophy and limitations. I know, odd hobby.

In the end, as has often been stated, there is no perfect H&N restraint. Any design has limitations, restrictions and fundamental flaws. Such is the way of nature and design, which always favors entropy.

ltc

The above thread is meant in no way to be an endorsement (or criticism) for any commercially available H&N restraint.

The last thing I want to do is start another "Rennlist Racing/DE forum" jihad over H&N restraints.....which then turns into an oil viscosity jihad.....which then turns into a "proper tow vehicle" jihad.

You know, the stuff that takes up lots of John D's disk space.

cooleyjb

I agree and look forward to future improvements and refinements and how they accomplish this.
I think it is a smart business move on their part. I know of a number of people who are very turned off to Isaac because of gbaker and the way he has responded in H&N threads in numerous motorsports forums. I appreciate his knowledge and what it adds to the conversations.


I too appreciate that you have multiple devices and are very willing to tell everyone about your experiecnes. AFAIK you are the only person I know who has dealt with the LEATT device as well and was actually going to shoot you a PM about your thoughts on it.

ltc

My son has run 2 kart races so far this season with his Leatt Moto GPX.
After seeing it at the track, 6 additional drivers/parents ordered the device.

There are no issues with stability and adjustment/construction is very good. It is fairly easy to see how it does control head motion. Again, not optimized for karting vs motocross, but IMHO it is FAR better than a foam collar. Yes, it looks a bit like a toilet seat, but after seeing several kart "end over end" crashes in Florida over the winter, I quickly realized a foam collar was a bit "lacking".
Unfortunately, we still travel with the foam collar in case someone at the track "didn't get the memo" regarding WKA approval. So far the driver has had zero complaints and prefers it to a foam collar.

And most importantly, the team CEO (re: wife/mother ) is happy seeing it used on track.

I have not yet placed an order for a Leatt Moto R (SFI 38.1 approved), as (unfortunately), I won't be taking the Cup car out this year; so I wouldn't be able to evaluate it.

ltc

My apologies to the thread owner/starter for the detour.

Congo

Off topic, but the CoT is a joke...it has taken 6 years to put it on the track.

http://abcnews.go.com/Sports/wireStory?id=3102692

Bill935K3

I have a 6 year old HAN Last weekend at LRP I compared it to a new on a friend just purchased. There have been many changes on is the base thickness and taper of the part that rises off the shoulder mount is significantly thiner.

kurt M

lets keep this in the right scale too. Note that the cracking was described as slight and surface. Not any kind of structure failure but more on the lines of sign of stress having been input and resisted. It should not be dismissed but with the cracking only showing up in devices that have been in a high G event H&D should give the user a new one and use the persons face and event story as a sales point of another driver that kept his/her head so to speak. I bet that 99.9% of the devices will never be "field tested" so this is a good bet on the makers part.

hacker-pschorr

I just posted this as an FYI since many people who frequent this forum use the device.

I agree with most here that a cracked HANS means the drivers neck was saved.

srf506

Hey Itc, you stated in your post that you try H&N restraints as a hobby. How do you do that? Do you have an impact test set-up in your basement ike the insurance car crash safety tests you see on TV? Just funnin' with you ;-)

chrisp

my point about gbaker wasn't an attempt to find someone who will step in and bash HANS/promote ISAAC but rather to find perhaps the only person posting on this forum that fully understands the loads and the affect a crack (sudden release of energy) would have on the driver.

sjanes

From the ABC article posted above: "I flipped my visor open and put my hands in my helmet to grab on, then I tucked down and got in the fetal position and planned for the worst.".

That's kind of an odd thing to do isnt' it? Wouldn't you want the visor closed during a wreck to prevent anything from getting into the helmet?

gbaker

See below:





Zero, in this case.

70Gs offset 30 deg from frontal, in this case.

Economy model, in this case.

cooleyjb

WOW, thanks for the shots. I didn't expect to see those ever. And for the nubmers. I thought NASCAR didn't release those stats.