home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: rec.motorcycles
- Path: sparky!uunet!caen!destroyer!news.iastate.edu!tomes
- From: tomes@iastate.edu ()
- Subject: Re: HELMETS
- Message-ID: <By1DKv.JLo@news.iastate.edu>
- Sender: news@news.iastate.edu (USENET News System)
- Organization: Iowa State University, Ames, IA
- References: <1992Nov19.200105.12133@megatek.com> <BxzJwI.AB@news.iastate.edu> <1992Nov20.175637.19602@megatek.com>
- Date: Fri, 20 Nov 1992 22:38:53 GMT
- Lines: 67
-
- In article <1992Nov20.175637.19602@megatek.com> randy@megatek.com writes:
- >In article <BxzJwI.AB@news.iastate.edu> tomes@iastate.edu writes:
-
- > I mentioned, no less than three separate and distinct times in the posting
- >you are responding to, that I was seeing a helmet as a liability at LOW speeds
- >and I went on to state (very clearly) that I was quantifying this as speeds
- >less than 30-40 mph. I fail to see the parallel with a helicopter pilot, whose
- >cockpit restricts his vision more than the helmet is likely to, anyway. I've
-
- The effect you are referring to is known to the rest of the world as
- "Situational Awareness" and describes the conceptual understanding of the
- environment necesssary to perfom a specific function, in the case of a
- fighter pilot or helicopter pilot the threat scenario and tactical
- situation. In the case of a motorcyclist, it is the possible hazards and
- riding environment. Except for the difference between a 2-dimensional
- environment and a 3-dimensional environment, and a slight difference in
- terms, what are the differences that you refer to?
-
- As for the reasons to wear a helmet (on not) the speed of the rider does
- not really factor into helmet effectiveness. The majority of the forces
- on a helmet are in the z direction: up. The helmet does not stick to the
- road very well, but does bounce like a ball. The times that it strikes
- something fixed, it makes a difference. Usually, the head strikes the
- ground. (see Hurt report, others listed in spring issue of Safe Cycling)
- Since the speed of the head in the z direction is almost entirely due to
- the height it falls from, speed (parallel to the ground) is not a major
- factor.
-
- > I am very happy that you have some experience via a second hand source in
- >the area of human factors engineering, but I'm of the strong opinion that it
- >might be *easier* and more accurate to evaluate this first hand, as I have,
- >rather than try to predict it based on "evidence" from an unrelated source.
-
- Ok, I admit listening to a professional researcher may be a little risky
- without demanding to see his credentials, finaciers, and sample of blood and
- bone tissue, but he happens to be a relative and I didn't want to piss him off.
-
- I guess I should have paid more attention to the rest of the human factors
- people at Rockwell-Collins when I worked with them on the EDMS conceptual
- demonstrator, but I must have been thinking about why I should not wear a
- helmet when I ride at low speeds in a high traffic urban environment with
- unpredictable cages.
-
- But I have had some minor experience in riding, and teaching rider education.
- I admit to being more than a little impressed with the research presented by
- the MSF, but then again the MSF has done a pretty good job of keeping the
- studies vaild. I have been in a motorcycle accident where my head hit the
- ground hard enough to scratch the helmet, and I was only going 25 mph.
- I probably would have suffered a mild concussion had I not been wearing it.
-
- I have also had a lot of bicycle riding and racing experience, and have
- ridden in traffic quite a bit (every training ride). My bicycle helmet
- certainly does not intrude on sideways peripheral vision, and I do not perceive
- a reduction of situational awareness when I switch to the motorcycle helmet
- when I ride one of my motorcycles. Bicycle racing almost always takes place
- at speeds less than 40 mph, and I have been in my share of crashes in
- criteriums. The three times that my helmet has been damaged, I was unable
- to tuck and roll and avoid hitting my head.
-
- If you can accurately predict before you leave home whether you will or will
- not be involved in an incident where you hit your head hard enough to cause
- injury, then you can enjoy the same level of protection that you would if
- you had no clue and had to wear the helmet all of the time.
-
- CP Tomes
- Peripheral Vision? I don need no steenkin peripheral vision!!!
-
-