Or, if you really wanted to go the other way completely.......
Take, for example a Diesel Electric Locomotive. Say, the EMD SD-90MAC.
The prime-mover (Diesel Engine) is a V-16 2-stroke Direct Injection
Turbo-Diesel. It's RPM range is from 300-900. It generates 6000hp at
900rpm. Given the formula from an earlier e-mail, that would be 35013.3c
lb/ft of torque. No wonder the railroads can pull mile long 8000 ton trains
at speeds up to 79 mph (FRA speed limit on all Class 1 Railraods) with only
12-24 drive wheels. And steel on steel at that.
But really, with this application, it doesn't matter how wide the torque
curve is. With Hybrid drives like a diesel-electric, you just turn the
generator at a constant speed and that provides full power to the 1000hp
traction Motors that are mounted on each of the 6 axles. :)
-Peter
p.s. I have several expensive hobbies, and Model Railraods are one of them.
:)
-----Original Message-----
From: Dan Bratten
To: mrc01@flash.net; Allendorfer, Peter
Cc: 'Andy McKee '; 'Kit Wetzler '; 'Bay Area Autox '
Sent: 1/27/00 9:38 AM
Subject: Re: Rotary torque & noise
Looks like I fell victim to 'late night reasoning' -- or lack
thereof. Yes, I remember my motorcrossers well, now that you mention
it. Seems I forgot when I posed the question. My S800 would be
another example too.
>power-band. It really doesn't matter how tqall it is, but how wide.
:)
How wide and how high -- right?
Thanks to everyone for the discussion.
--Dan
At 8:56 AM -0800 1/27/00, Michael R. Clements wrote:
>My last bike had torque and power increasing to 11,500 RPM, where
>torque leveled off. Power increased to 13,000 RPM, where it hit
>the rev limiter.
>
>On the S2000, Torque & Power both increase past 5,252 RPM and
>peak out somewhere from 7,000 to 9,000 RPM.
>
>"Allendorfer, Peter" wrote:
> >
> > Ever been on a Motorcycle?? They will be climbing that torque
curve to
> > about 10,000rpm (At least the modern Crotch-Rockets will...... And
also
> > about the size of the torque curve. That's what Dirt-bike riders
have been
> > talking about for years. When you hit the "Power Band" and how
>wide is your
> > power-band. It really doesn't matter how tqall it is, but how
wide. :)
> >
> > -Peter Allendorfer
> > '91 Miata aka, "Snuggles"
> > Co-driver '96 Impala SS aka Habib the Taxi Driver!
> >
> > -----Original Message-----
> > From: Dan Bratten
> > To: Andy McKee; mrc01@flash.net; Kit Wetzler
> > Cc: Bay Area Autox
> > Sent: 1/27/00 12:35 AM
> > Subject: Re: Rotary torque & noise
> >
> > At 11:26 PM -0800 1/26/00, Andy McKee wrote:
> > >story at one specific rpm. Locating that area higher on the rpm
range
> > allows
> > >taller gear ratio choices to maintain equivalent ground speeds
than
> > >a lower rpm
> > >range engine, thus greater overall acceleration.
> >
> > May I ask for clarification to my question about Torque = HP @
5,252
> > RPM which was explained to be true? Are there cases where Torque
and
> > HP will both be increasing beyond 5,252 RPM? I can see it plotted
out
> > -- but does it happen in the real world?
> >
> > A yes or no with perhaps an example will suffice as the math, as
> > evidenced no doubt by my questions, will only add to my confusion.
:-)
> >
> > --Dan
> >
> > Dan L. Bratten
> > '79 Trans Am 455/5sp -- CP 37 (Continual Project)
> > <http://24.240.36.69/CP/>
>
>--
>Michael R. Clements
>mrc01@flash.net
>A government big enough to give you everything you want
>is also big enough to take away everything you have.
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