HANS device

From Wikipedia, the free encyclopedia
Jump to: navigation, search
2005, 2006 and 2007 WTCC Champion Andy Priaulx with a HANS device
NASCAR driver Ken Schrader's HANS device

The HANS device (also known as a head restraint) (Head and Neck Support device) is a safety item compulsory in many car racing sports. It reduces the likelihood of head and/or neck injuries, such as a basilar skull fracture, in the event of a crash.



[edit] Description

1. HANS device, 2. Tether (one per side), 3. Helmet anchor (one per side), and 4. Shoulder support.

Primarily made of carbon-fiber, the device is U-shaped, with the back of the U set behind the nape of the neck, and the two arms laying flat along the top of the chest over the pectoral muscles; the device in general supported by the shoulders. It is attached only to the helmet — and not to the belts, driver's body, or seat — by two anchors on either side, much like the Hutchens device but placed slightly back. In a properly installed 5-point or 6-point racing harness, the belts that cross the driver's upper body pass directly over the HANS device on the driver's shoulders, and they buckle at the center of the driver's abdomen. Therefore, the HANS device is secured with the body of the driver, not the seat.

The purpose of the device is to stop the head from whipping forward in a crash, without otherwise restricting movement of the neck. In a crash, an unprotected body is decelerated by the seatbelt with the head maintaining velocity until it is decelerated by the neck. The HANS device maintains the relative position of the head to the body, with the device transferring energy to the much stronger chest, torso, shoulder, seatbelts, and seat as the head is decelerated.

[edit] History

The device was designed in the early 1980s by Dr. Robert Hubbard, a professor of biomechanical engineering at Michigan State University. After talking to his brother-in-law, road-racer Jim Downing, following the death of one of their mutual friends, Patrick Jacquemart who was killed in IMSA testing accident at Mid-Ohio, when his Renault Le Car struck a sandbank leaving him dead on arrival with head injuries,[1][2] it was decided that some sort of protection was required to help prevent injuries from sudden stops, especially during accidents. A major cause of death amongst drivers during races was through violent head movements, where the body remains in place because of the seat belts but the momentum keeps the head moving forwards, causing a Basilar skull fracture resulting in serious injury or immediate death.

Notable race car drivers who died from Basilar skull fractures include:

While death from such injuries is usually immediate, some drivers have survived Basilar skull fractures such as NASCAR's Ernie Irvan and F1's Philippe Streiff.

Dr. Hubbard has had extensive experience as a biomechanical crash engineer, including in General Motors' auto safety program. His first prototype was developed in 1985, and in crash tests in 1989—the first to use crash sleds and crash dummies using race car seat belt harnesses—the energy exerted on the head and neck was lowered by some 80%.[2]

After major racing safety companies declined to produce the product, Hubbard and Downing formed Hubbard Downing Inc, to develop, manufacture, sell and promote the HANS in 1991. However, the product languished until 1994, when Formula 1 showed interest in the wake of the deaths of Roland Ratzenberger and Ayrton Senna. In 1999, CART driver Gonzalo Rodriguez was killed after suffering a basilar skull fracture in a crash. At the same time, Mercedes was completing research of the HANS on behalf of the FIA for Formula 1, finally deciding that it out-performed their airbag project.[4]

On February 18, 2001, Dale Earnhardt was killed in the Daytona 500, the fourth death in NASCAR in a 14-month span due to basilar skull fractures. While it is still debated whether his death was the result of a broken seat belt, or inadequate head and neck restraint, the fact remained that he died of a basilar skull fracture, which is prevented by the proper use of belts and a head / neck restraint. Dr. Hubbard is quoted:

"...(I was) shocked by that. I recorded about 80 entries in my telephone log the first day. And I didn't even write them all down. I was on National television 10 times that Monday. I had been down in Florida and came home on Friday and went cross country skiing in Michigan. So, I didn't know he died until I got home and there was voice mail on my answering machine at 10 o'clock at night. I actually had 2 interviews that night before I went to bed."[2]

Before this point, many drivers, including Earnhardt Sr.,[5] resisted the HANS (and similar) devices, claiming them to be uncomfortable, more restrictive and fearing that it would cause more injuries and problems than it prevented. Some stated that the positioning of the device made the seat belts feel less secure or rubbed on the shoulders or collar bone. Earnhardt Sr. himself referred to the device as "that damn noose", claiming the tethers would sooner hang him than save him in the event of a crash. The week after Earnhardt's fatal crash, Mark Martin had said at Rockingham, "I would not wear one for anything I'll just keep my fingers crossed and take my chances"[5] However, drivers were not willing to participate in the process of perfecting the fit, and endure the limitations imposed by such devices.

The device was first adopted by the National Hot Rod Association in 1996, following the death of Top Fuel driver Blaine Johnson, but wasn't a mandatory device until 2004, after the death of 2003 Top Fuel Rookie of the Year Darrell Russell, who was killed during the Sears Craftsman Nationals in Madison, Illinois. Since that time, all drivers in all categories, either professional, or sportsman, must wear a HANS device, or risk immediate disqualification from the event. Much like NASCAR, the NHRA authorized the use of both the HANS, and the Hutchens device until 2005, when the HANS became the sole head and neck restraint device used. The major difference between the HANS device used in NASCAR, CART, or Formula 1, and the one used in the NHRA is that the main part of the device is molded from high strength polymers. The NHRA version is also wrapped with seven layers of Nomex fabric, which is the same material as the seven-layer fire suits that all NHRA drivers must wear. This extra precaution prevents the device from melting should an engine fire occur.

Formula One mandated HANS devices in 2003 after extensive testing, sharing the results with other FIA affiliates. Using that information, CART made the device compulsory for oval tracks in 2001, later requiring the HANS devices for all circuits. Starting in October, 2001, NASCAR mandated either the HANS or Hutchens device head and neck restraint be used, going with the HANS device exclusively starting in 2005. ARCA followed suit in the wake of a basal skull fracture crash fatality in an ARCA race at Lowe's in October 2001 which claimed the life of Blaise Alexander. The World Rally Championship and Australian V8 Supercar Series made the device compulsory for drivers in the 2005 season.

Acceptance by drivers was helped by the addition of quick-release shackles developed and implemented by Ashley Tilling. They were sourced from the marine industry, being used on racing sailboat rigging. The shackles allowed the drivers a simple and quick pull to release the HANS device and exit their vehicle. The first driver to utilize them was NASCAR driver Scott Pruett of PPI Motorsports. Shackles were also used on the Hutchens device and others.

Today, most major auto racing sanctioning bodies mandate the use of head and neck restraints; the FIA has made HANS use compulsory for all International-level events from the beginning of 2009. Even monster truck drivers use the HANS device in many events.

Starting in July 2007, many sanctioning bodies have approved any head-and-neck restraint which passes the SFI Foundation Specification 38.1 standard. They are the HANS, Moto-R Sport, R3, Hutch-II, Hutchens Hybrid, or Hybrid X.

[edit] References

  1. ^ Motorsport Memorial
  2. ^ a b c The History Of The HANS Device As Told By Dr. Bob Hubbard by Marty Tyler - CATCHFENCE.com - NASCAR, NNCS, NBS, CTS, ARCA, USAR, USAC, Other Series News, commentary, opinion, stories, information
  3. ^ Helping HANS
  4. ^ AutoRacing1.com - NASCAR Good O'l Boys Page
  5. ^ a b Hinton, Ed (2002). Daytona: From the Birth of Speed to the Death of the Man in Black. Warner Books. p. 426. ISBN 0-446-61178-6. Google Book Search. Retrieved on 2009-06-07.

[edit] External links

Preceded by
Audi R10
Pioneering and Innovation Award

Succeeded by
2008 Singapore GP
Personal tools