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- From: pae@teal.csn.org (Phil Earnhardt)
- Newsgroups: rec.skate
- Subject: Re: ROLLER-BRAKE Survey Results & Continued...
- Message-ID: <BzosMH.8AE@csn.org>
- Date: 23 Dec 92 00:42:17 GMT
- References: <1992Dec17.023657.16553@vax5.cit.cornell.edu> <BzMnBE.1vy@csn.org> <STXTNT.92Dec22102934@rs733.GSFC.NASA.Gov>
- Sender: news@csn.org (news)
- Distribution: rec
- Organization: Colorado SuperNet, Inc.
- Lines: 54
- Nntp-Posting-Host: teal.csn.org
-
- In article <STXTNT.92Dec22102934@rs733.GSFC.NASA.Gov> stxtnt@rs733.GSFC.NASA.Gov (Nigel Tzeng) writes:
-
- >>One other comment about ABS: I'd be happier of *everybody* took a half-day
- >>ice driving course than if *everybody* had ABS. We'd be better off if
- >>everyone knew the limits of their vehicles and drove accordingly -- if they
- >>drove in such a way that they didn't *need* to use the stopping power of an
- >>ABS. After all, it doesn't do you a whole heck of a lot of good if *you* can
- >>stop but the driver behind you can't. ABS won't help if you're not alert.
- >
- >Maybe the example isn't that bad you know. It should be easy to teach
- >anyone with ABS how to threshold brake on a vehicle equipped with ABS.
- >You apply brakes hard enough to activate the ABS system and then ease
- >off until it stops pulsing. At that point you should be applying the
- >maximum braking force without locking wheels...ie threshold braking.
-
- You have made an assumption about using threshold braking that simply may not
- be true. I'd guess that anyone who is skilled at threshold braking would not
- want ABS on their cars -- it adds weight and it's doing a function that the
- driver is better at doing.
-
- One other comment: if you're not going to use threshold braking (and nobody
- should, unless they're highly trained) and you're in a car equipped with ABS,
- you should *use* the ABS -- hit the brakes hard -- when you need to stop
- quickly. Lots of people don't do this: they apply their ABS brakes timidly
- on snow, even when they need to stop quickly.
-
- This is another example of technology being no substitute for skills.
-
- >Somehow I really doubt you can get as much braking power from braking
- >a single wheel (or two) as you can from heel brakes. The amount of
- >pressure you can get from heel brakes can be tremendous. He's been
- >rather vague on just how the system might work (understandably :) but
- >unless you can put the majority of your weight on the brake (or have a
- >much larger contact patch) it shouldn't work as well. If it is much
- >easier to use (a la ABS) it may be useful though...assuming it has no
- >undesired failure modes :).
-
- I'm just wondering where the energy is supposed to go. If braking force is
- achieved by wearing away wheel material, then I'm unimpressed: wheels cost
- more than brakes. If the kinetic energy is translated into heat, I'm
- interested in how easy it'll be to exceed the thermal limits of the braking
- system.
-
- I-70 from Vail Pass to Vail has runaway truck runouts. Unfortunately, the
- bike path does not have runaway bike/skater runouts.
-
- >Either way...fast braking will require the user to have good fore-aft balance
- >(as you mentioned). If you have that you can probably heel brake...
-
- You betcha. It'll be interesting to see how beginners cope with the system.
-
- >Nigel Tzeng
-
- --phil
-