kurt M

It is torque that makes them slide off, not HP.

Circuit Motorsports

Entirely NOT true. The issue is shoulder belt geometry. The device was designed with a 3" belt in mind.

gbaker

Trail braking is the primary culprit, followed by too much camber.

ltc

It's been a while since we've had a good H&N restraint or Danica Patrick "discussion", so I guess it was inevitable.

Weston

While belt geometry is certainly a factor, I find the fact that 3" belts don't properly fit over the HANS as compelling evidence that it wasn't really designed for them. The 3" belts are wider than the surface area meant for them on the HANS. And then there's the fact that are 2" belts that are specifically manufactured for use with the HANS, and sanctioning bodies allow them only when used with a HANS.

It can be compatible with 3" belts if done right, but saying that it was specifically designed for them would reflect poorly on the abilities of the designers, because there are obviously widespread problems with that. It's a good product, but it simply doesn't handle 3" belts as well as others. And back to the actual topic at hand, the other HANS models seem to have just as many reports of this problem as the Sport model does.

Circuit Motorsports

Again No


From the HANS guide

Note in the picture how the belts are supposed to go up the side of the yoke and the outside edge of the belt is at the lip.

Weston

Too bad that doesn't work so well in the real world. The simple fact remains that the installation specs are not news to racers, and it's not uncommon for people to have issues with belts sliding off of the HANS, and that's not limited to the Sport model.

If I had to do it all over again, I'd buy a DefNder, even though it looks like something a Honda ricer puked up... slightly less over-priced, and probably better at keeping the belts in place.

Circuit Motorsports

If that's the case then why are over 90% of the shoulder belts I see in cars PCA, SCCA, NASA, GrandAm NOT installed within those specs or the FIA recommended specs (which are the same DefNder recommends as well)

kurt M

Defcon 4! dive dive dive!

ltc

The world is actually flat and carried on the back of a giant tortoise.

HANS (pick a revision, any revision) devices always stay underneath the belts.



I love good bedtime stories.

gbaker

Didn't Danica look great in that latest GoDaddy ad?

mglobe

I think Danica is hot, and a good driver too.

paradisenb

I'd Hit it.

333pg333

In an ideal world I have come to the assumption that if building up a car with cage and seat that you should take your HANS (or similar device) with you when designing and fitting cage / seat? Having never used a HANS I am wondering if this is a good idea or necessary?

Circuit Motorsports

The best route would be to get the FIA belt mounting recommendations and go from there. They have the relative locations mapped out for a number of distances behind the driver that the shoulder harnesses can be mounted.

http://argent.fia.com/web/fia-public..._HANS_2007.pdf