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Torque and HP

Yahoo Message Number: 2193
On the forums one regularly sees a debate about the importance of HP and torque. One camp feels HP is more important and the other believes it is torque.

This video on OPB provides a fairly convincing demonstration for one camp. It surprised me that the gap was so wide.

http://www.opb.org/programs/ofg/videos/view/56-Electric-Drag-Racing

Don

Re: Torque and HP

Reply #1 –
Yahoo Message Number: 2198
With respect to the potential for electric powered hybrid MH's, Freightliner seems to be headed that way.

http://www.freightlinerchassis.com/pdf/mh/ecoFRED_flyer.pdf

And Winnie and Fleetwood are working with it.

http://www.autobloggreen.com/2008/12/04/freightliner-launches-hybrid-motorhome-chassis/

Don


On 1-Feb-09, at 12:36 PM, Don Leslie wrote:

Re: Torque and HP

Reply #2 –
Yahoo Message Number: 2199

Am I missing something or is the advantage of a hybrid the benefit of electric when sitting, during slow speed driving, or when driving in stop and go traffic. If this is true how often does a MH operate in these conditions? Is it enough to outweigh the cost difference ? I can't imagine one would ever reach payback unless they drive mostly in city type traffic. Educate me.

Re: Torque and HP

Reply #3 –
Yahoo Message Number: 2200
Certainly, on the surface that would seem to be an issue when one looks at discussion on hybrid cars - significant saving in slow stop and go traffic and far less at highway speeds.

There is another aspect "I think" and that is moving weight - heavy weight such as motorhomes. If one looks at the railway industry we see diesel engines - but not using direct drive. That is, the diesels in most cases do not directly drive the wheels of the engine. The diesel is attached to a generator that produces electricity that is used to move the train. I profess no technical expertise in this area but have found there is a lot of info on the net and wiki is a good place to start. It is interesting to see that Allison is very involved in this area.

http://en.wikipedia.org/wiki/Diesel_electric

Don



On 1-Feb-09, at 10:44 PM,

Re: Torque and HP

Reply #4 –
Yahoo Message Number: 2201
After my reply, I went to my racing info site to get the day's news on auto racing. There, I found a note on using shock absorbers to produce power. First time I heard of that source and it appears it and others are headed for prime time soon.

You can read about this development at: http://www.gizmag.com/regeneration-no-longer-just-about-braking/10640/

When I was reading the article a window appeared inviting me to subscribe to their newsletter. Looked interesting, so I did.

Don


On 1-Feb-09, at 10:44 PM,

Re: Torque and HP

Reply #5 –
Yahoo Message Number: 2202
I think that a hybrid motorhome would have an advantage on more types
of driving than a car would have. For example, mountain driving which
I do alot, I have to use brakes for curves much more than I do in a
car and then accelerate back up to speed, just like city driving.
Also, where a car would not be able to retrieve much energy going down
a hill, the weight of a motorhome would help it to generate
electricity, so your electric motor becomes a generator and can be
used instead of an exhaust brake. Especially since in a motorhome you
are much less likely to just let it gain speed all the way down.

Of course, if you mostly drive flat freeways, there would not be much
of an advantage. Even so, if the hybrid had the same power of our
current diesel, I would be tempted to get one even if I did not think
there would be a payback. It is just good to have another choice for
engines.

David

Quote
Certainly, on the surface that would seem to be an issue when one
looks at discussion on hybrid cars - significant saving in slow stop
and go traffic and far less at highway speeds.

There is another aspect "I think" and that is moving weight - heavy
weight such as motorhomes. If one looks at the railway industry we
see diesel engines - but not using direct drive. That is, the diesels
in most cases do not directly drive the wheels of the engine. The
diesel is attached to a generator that produces electricity that is
used to move the train. I profess no technical expertise in this area
but have found there is a lot of info on the net and wiki is a good
place to start. It is interesting to see that Allison is very
involved in this area.

http://en.wikipedia.org/wiki/Diesel_electric

Don

On 1-Feb-09, at 10:44 PM, rsri1@... wrote:

Am I missing something or is the advantage of a hybrid the benefit
of electric when sitting, during slow speed driving, or when
driving in stop and go traffic. If this is true how often does a MH
operate in these conditions? Is it enough to outweigh the cost
difference ? I can't imagine one would ever reach payback unless
they drive mostly in city type traffic. Educate me.

In a message dated 2/1/2009 10:26:41 P.M. Eastern Standard Time,
grandriver125@...

Quote
writes:
With respect to the potential for electric powered hybrid MH's,
Freightliner seems to be headed that way.

http://www.freightlinerchassis.com/pdf/mh/ecoFRED_flyer.pdf

And Winnie and Fleetwood are working with it.

http://www.autobloggreen.com/2008/12/04/freightliner-launches-hybrid-motorhome-chassis/