Subject: Re: [EVDL] Range vs Speed
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On a road bike (more efficient than thick tired MTB) bicycle tires are very
thin. There is some heat generated in the rubber itself
Klaus,
I am sorry you are wrong. It is pretty clear if you drive hard on over
inflated tires that you have far less traction. In an emergency - such as
when raining you will slide and hydroplane more easily. There is not a
constant, or linear function between pressure on the road and control.
John Lussmyer via EV wrote:
My problem is finding a LRR tire that fits a Ford F-250 truck...
Interestingly enough, I've read that they *do* make low rolling
resistance tires for heavy trucks. Fuel economy matters a lot to
long-haul truckers!
Now, how low their LRR tires are, I don't know.
Nothing voodoo about it. Minimizing energy use and maximizing percent energy
regained with regen are two different things. I said you get more energy
back into the pack stopping faster with regen. Of course net energy use
increases with more stops/starts, but percentage energy regained with
LRR is code for labeled for high pressure. No 35 psi tire is LRR.
Load range E truck tires (80 psi) in a highway tread are almost all rated
as LRR. So I am confused when you say you can't find a LRR tire for your
truck? And yes, I have personally run 44 psi car tires at 75 psi for
their entire
As for losing 10 mpg by switching to different LRR tires, I bet $50 they
had the pressure at 32psi front, 28 psi back. That is only way to lose 10
mpg. Two different LRR tires might be 1-3 mpg different, not 10 mpg!
On Nov 10, 2014 8:27 AM, Marcus Reddish marcus.redd...@gmail.com wrote:
LRR is
-
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Marcus Reddish via EV
Sent: Monday, November 10, 2014 8:51 AM
To: tomw; Electric Vehicle Discussion List
Subject: Re: [EVDL] Range vs Speed
As for losing 10 mpg by switching to different LRR tires, I bet $50 they had
the
pressure
Marcus Reddish via EV wrote:
As for losing 10 mpg by switching to different LRR tires, I bet $50 they
had the pressure at 32psi front, 28 psi back. That is only way to lose 10
mpg. Two different LRR tires might be 1-3 mpg different, not 10 mpg!
Part of the problem is that LRR is too often just
jerry freedomev via EV wrote:
Hi Lee and All, I'm using some early Mazda Miata front hubs, brakes
that has retraction V shaped springs that with just a couple tiny
holes drilled in the pad for the wire spring end to fit, could fit
many disc brakes that don't have them stock. Likely able to do it
...@lists.evdl.org] On Behalf Of Lee Hart via EV
Sent: Monday, November 10, 2014 10:56 AM
To: jerry freedomev; Electric Vehicle Discussion List
Subject: Re: [EVDL] Range vs Speed
jerry freedomev via EV wrote:
Hi Lee and All, I'm using some early Mazda Miata front hubs, brakes
that has retraction V shaped
I wonder why motorcycle tires are so much worse. Bicycle tires are
obviously very good. What is different about motorcycle tires. Is there
some fundamental reason for the higher rolling resistance, or is it just
that the manufacturers don't bother (and customers don't care)?
Not 100%
On a road bike (more efficient than thick tired MTB) bicycle tires are very
thin. There is some heat generated in the rubber itself from weighting and
de-weighting and side loads. The molecules are literally sliding across
each other, unwinding and winding back up. Heat results. The fabric
Tel: +1 408 383 7626
-Original Message-
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Michael Ross
via EV
Sent: Monday, November 10, 2014 1:48 PM
To: Lee Hart; Electric Vehicle Discussion List
Subject: Re: [EVDL] Range vs Speed
On a road bike (more efficient than thick tired
, 2014 11:02 PM
To: tomw; Electric Vehicle Discussion List
Subject: Re: [EVDL] Range vs Speed
Nice explaination Tom.
Al
- Original Message -
From: tomw via EV ev@lists.evdl.org
To: ev@lists.evdl.org
Sent: Saturday, November 08, 2014 10:36 AM
Subject: Re: [EVDL] Range vs Speed
I looked
...@lists.evdl.org] On Behalf Of Al via EV
Sent: Saturday, November 08, 2014 11:02 PM
To: tomw; Electric Vehicle Discussion List
Subject: Re: [EVDL] Range vs Speed
Nice explaination Tom.
Al
- Original Message -
From: tomw via EV ev@lists.evdl.org
To: ev@lists.evdl.org
Sent: Saturday, November
Of Rush Dougherty
via EV
Sent: Sunday, November 09, 2014 7:53 PM
To: 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] Range vs Speed
The right LRR tires makes a big difference also. When I had to replace
my year
2000 Honda Insight tires about 5 years ago, I went to my local Discount
Tire
On Sun Nov 09 19:52:56 PST 2014 ev@lists.evdl.org said:
The right LRR tires makes a big difference also. When I had to replace my year
My problem is finding a LRR tire that fits a Ford F-250 truck...
--
Try my Sensible Email package! https://sourceforge.net/projects/sensibleemail/
Message-
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Cor van de Water via
EV
Sent: Sunday, November 09, 2014 9:12 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Range vs Speed
Those were also the tires for the gen 1 USA Prius, although I believe they
have
@lists.evdl.org
To: Electric Vehicle Discussion List ev@lists.evdl.org; Rush Dougherty
r...@ironandwood.org
Sent: Sunday, November 9, 2014 11:12 PM
Subject: Re: [EVDL] Range vs Speed
On Sun Nov 09 19:52:56 PST 2014 ev@lists.evdl.org said:
The right LRR tires makes a big difference also. When I
Yup...
I put up two pdf's about LRR, one from Green Seal in Mar 2003, the other from
the Transportation Research Board in 2006 http://tucsonev.com/LRR.html
Old, but the info is still good. Hopefully there are still some tires being
manufactured...
Rush
www.TucsonEV.com
-Original
://www.cvandewater.info
Skype: cor_van_de_water Tel: +1 408 383 7626
-Original Message-
From: Rush Dougherty [mailto:r...@ironandwood.org]
Sent: Sunday, November 09, 2014 8:35 PM
To: Cor van de Water; 'Electric Vehicle Discussion List'
Subject: RE: [EVDL] Range vs Speed
The subject
I looked at the effect of acceleration and deceleration rates on energy used
per acceleration-deceleration cycle a while back. To simplify the
calculation I assumed the same rate for acceleration and deceleration. You
do get more energy into the pack stopping faster with regen. For example,
at a
/The wind losses are proportional to the cube of *speed* period./
To clarify, the drag force is proportional to vehicle speed squared. Power,
or energy/time, is the product of this force and vehicle speed, so is
proportional to speed cubed. Then the work done per unit time against this
force is
Nice explaination Tom.
Al
- Original Message -
From: tomw via EV ev@lists.evdl.org
To: ev@lists.evdl.org
Sent: Saturday, November 08, 2014 10:36 AM
Subject: Re: [EVDL] Range vs Speed
I looked at the effect of acceleration and deceleration rates on energy
used
per acceleration
:* Re: [EVDL] Range vs Speed
Yep, It is the speed. However, if you always accelerate hard you will
spend more time cubing your higher speed as drag losses, than if you take
it easy and go easy cubing a lower speed for a longer time.
So, take it easy speeding up, and get on the regen hard
I think people tend to generalize, thinking high speed must be
high-consumption and low speed low. As in most things, it depends. If you
rive for low consumption, high speed can be pretty economical. I've seen
this with my ICE vehicle watching the real time consumption readout,
sometimes see 50+
What you experience is obviously correct, but why is the fun part.
The work done and energy consumed are how to get at it.
If you start and stop at the same locations and take the same route, then
changes in gravitational potential(height) wash out to 0.
Then you are left with mass x
Energy used in driving is simple physics:
Everything you put into acceleration you get back in Momentum.
Everything you put into a hill, you get back as potential energy.
Everything you put into braking is LOST (regen gains some back).
Wind resistance goes up as the cube of speed.
So the only
/“Then you are left with mass x acceleration, and frictional effects. Wind
and air drag is the predominant loss and speed related - hence the
wonderment about not much difference. Rolling resistance is not that big a
deal, comparatively; though you can certainly quibble over rough roads and
Generally, correct.
On 11/06/2014 07:49 AM, Robert Bruninga via EV wrote:
Energy used in driving is simple physics:
Everything you put into acceleration you get back in Momentum.
Everything you put into a hill, you get back as potential energy.
Everything you put into braking is LOST (regen
I should have graphed it out for myself as a reminder. When you accelerate
to speed up, the work done (velocity is changed) is in one direction,and
when you slow down in the other. You sum positive and negative
acceleration, and when you have stopped the sum is zero.
But the differences in
To: Robert Bruninga bruni...@usna.edu; Electric Vehicle Discussion List
ev@lists.evdl.org
Sent: Thursday, November 6, 2014 10:10 AM
Subject: Re: [EVDL] Range vs Speed
I should have graphed it out for myself as a reminder. When you accelerate
to speed up, the work done (velocity is changed
Except maybe it is a brick at low speeds too? The drag of a bluff body
might not change all that much and be terrible a low Reynolds numbers. I
can't remember such things without looking them up.
On Thu, Nov 6, 2014 at 12:38 PM, John Lussmyer via EV ev@lists.evdl.org
wrote:
I should have
How much does it weigh? What everyone else accelerates on every stop-start
is probably nothing compared to your situation.
Chris
On Nov 6, 2014 12:38 PM, John Lussmyer via EV ev@lists.evdl.org wrote:
I should have mentioned, this is with my electric F-250.
Aerodynamics of a brick.
I was
Oh, around 6200 lbs I think.
On Thu Nov 06 09:53:15 PST 2014 ctrom...@gmail.com said:
How much does it weigh? What everyone else accelerates on every stop-start
is probably nothing compared to your situation.
Chris
On Nov 6, 2014 12:38 PM, John Lussmyer via EV ev@lists.evdl.org wrote:
I
What things like heat or AC do you have? They were running for an additional
hour on the way back.
-- charles
On Nov 6, 2014, at 12:38 PM, John Lussmyer via EV ev@lists.evdl.org wrote:
I should have mentioned, this is with my electric F-250.
Aerodynamics of a brick.
I was REALLY
There's definitely a huge reduction in consumption when I drive at a steady
~30-40mph in traffic compared to 65mph+. Some days, when the charger fails
me, I pray for traffic so I can make it home.
Surface streets with all the stop signs and lights however don't reduce my
consumption nearly as
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