Re: [EVDL] Reaction time (was: Bill Dube nominated forDarwin Award.)
Marty Hewes wrote:
> During a burnout, by definition, the rider is holding the brake,
Well...one of them. Earlier someone postulated the sensor being "both
brakes and high current" ...or at least that's what I thought I read.
But if this killswitch would only be used during burnouts and was just
on the front brake, then ok, I'm with you.
> and the
> bike shouldn't gain enough traction to fully load the motor. But you have a
> point if the rider loses his grip on the brake lever. Arguably if he did,
> he'd lose his grip on the throttle also,and the bike would shut down anyway.
> I like Jeff's idea, a crewmember holding down a button on the end of a wire.
> That way the crew member could keep the wire out of the mechanicals, and
> shut down for emergencies besides a launch (like seeing a bystander
> wandering into the danger zone). Another pair of eyes would be good.
The crew member could just as easily hold onto a jetski-style pullcord
dealy, right? Or is that basically what you mean? I agree that a
nonrider being capable of killing the bike is a good idea! Perhaps even
an RF transmitter, so that a crew member could kill it during runs
> ----- Original Message -----
> From: "Hunter Cook" <[email protected]>
> To: "Electric Vehicle Discussion List" <[email protected]>
> Sent: Wednesday, September 19, 2007 3:06 PM
> Subject: Re: [EVDL] Reaction time (was: Bill Dube nominated forDarwin
> >I agree, a completely automatic system can clearly react faster than a
> > human-controlled killswitch. However, "high motor current plus brake
> > lights" is not automatic; the rider still has to be hitting the brakes.
> > I kind of like the jetski-esque deadman switch, attached to some fixed
> > object (lamppost?) for burnouts and to the rider otherwise.
> > On Sat, 2007-09-15 at 13:58 -0500, Marty Hewes wrote:
> >> I think the distinction is, no human operated kill system could have
> >> operated fast enough given the circumstances. I think you did as well as
> >> possible. But I think a totally automatic system triggered by a
> >> combination
> >> of inputs that should never coincide could have shut down power faster
> >> than
> >> any human can react, within milliseconds.
> >> High motor current plus brake lights has got to mean trouble.
> >> Are the forks and wheel off the shelf items?
> >> Marty
> >> ----- Original Message -----
> >> From: "Bill Dube" <[email protected]>
> >> To: "Electric Vehicle Discussion List" <[email protected]>
> >> Sent: Saturday, September 15, 2007 1:31 PM
> >> Subject: [EVDL] Reaction time (was: Bill Dube nominated for Darwin
> >> Award.)
> >> >I did manage to shut it down in about a second, but it goes quite a
> >> > distance in a second.
> >> >
> >> > It was not difficult to shut down, but it takes a finite amount of
> >> > time for a human to react. No matter what you choose as a shut-down,
> >> > the driver must react in _some_ way first. This takes about 3/4
> >> > second. Simply deciding to operate the brakes takes about 3/4 of a
> >> > second. No disconnect system would have worked faster than what
> >> > actually occurred.
> >> >
> >> > I _almost_ got it stopped. I needed about another 10 to 20 ft. That
> >> > is where I personally stopped, you will notice. Had the bike been
> >> > moving very fast, I would have gone a long way before I stopped. I
> >> > came to rest about ten feet beyond the car. This is where the bike
> >> > would have stopped. (Actually before that point.)
> >> >
> >> > The front forks are bent. The front wheel is bent. The pack has a
> >> > dent from the wheel. The front cowling is cracked. Everything else is
> >> > just fine. The front forks and wheel are very lightweight aluminum,
> >> > so they crumpled right up with this very minor impact.
> >> >
> >> > Bill D.
> >> >
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