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jcussen · 03-03-2019, 07:37 PM

Quote:

Originally Posted by powerboatr

lots of gold braided stuff on officers headgear., it resembles scrambled eggs.higher rank...equals more scrambled eggs, but not always senior in smarts.
I can say that as i have been both sides of that coin.

flt towing a EV, one would think the manufacturer would simply do a system update upon request to make it flat towable.
maybe shut down the systems that are not required ..seems simple enough

It probably is that simple, but in today's litigiousness society, no manufacturer would want to open themself up to a lawsuit if something went wrong.
Look at your fast food coffee cup "Caution, contents hot"

VP Chianese · 03-04-2019, 07:00 AM

Quote:

Originally Posted by jcussen

It probably is that simple, but in today's litigiousness society, no manufacturer would want to open themself up to a lawsuit if something went wrong.
Look at your fast food coffee cup "Caution, contents hot"

I'm sorry but I don't agree. It is that easy. Look at JEEP. On my 2017 Grand Cherokee with Quad II it is that simple. Start the JEEP, put your foot on the brake, move the gear shift into N, with foot on brake depress small indent button just behind the shifter until red light comes on, stop engine and shift the trans into Park. Reverse the procedure to drive the car.

JEEP has the same liability as Tesla would have.

RVPioneer · 03-04-2019, 07:38 AM

Quote:

Originally Posted by VP Chianese

I'm sorry but I don't agree. It is that easy. Look at JEEP. On my 2017 Grand Cherokee with Quad II it is that simple. Start the JEEP, put your foot on the brake, move the gear shift into N, with foot on brake depress small indent button just behind the shifter until red light comes on, stop engine and shift the trans into Park. Reverse the procedure to drive the car.

JEEP has the same liability as Tesla would have.

Jeep also has the “death wobble” issue with the 2016 and later MY GC since they switched to electronic power steering.

powerboatr · 03-04-2019, 07:57 AM

coasting in normal use, the electricity generated is absorbed as heat or put back in the battery bank. to be used as you go back up a hill.

maybe towing there is an overabundance of generated electricity to be dealt with.

one would think a switching off a power would solve this and make it a freewheel

tesla and others simply do not see it as a money making issue so they are not looking at a solution.
the one that does will be the king for a bit with the rv crowd.
EV makes sense for lots of rvers i am sure for a towed.
just saying
and for some weird reason here in texas we cannot buy a tesla, we can only lease them??

jcussen · 03-04-2019, 08:15 AM

Quote:

Originally Posted by VP Chianese

I'm sorry but I don't agree. It is that easy. Look at JEEP. On my 2017 Grand Cherokee with Quad II it is that simple. Start the JEEP, put your foot on the brake, move the gear shift into N, with foot on brake depress small indent button just behind the shifter until red light comes on, stop engine and shift the trans into Park. Reverse the procedure to drive the car.

JEEP has the same liability as Tesla would have.

Totally different, Pretty sure Testa is direct drive, wheels always connected to electric motors to allow regen. braking. All components stay connected, all controlled by software and electronics.

Pretty sure your wheels are mechanically disconnected from engine and transmission at the transfer case.

But agree, could be done, but all you need is one very small glitch in the electronics to destroy your car and maybe your motorhome. As of now, don't think Tesla or any EV manufacturer would want to take the chance.

RVPioneer · 03-04-2019, 09:04 AM

Quote:

Originally Posted by jcussen

Totally different, Pretty sure Testa is direct drive, wheels always connected to electric motors to allow regen. braking. All components stay connected, all controlled by software and electronics.

Pretty sure your wheels are mechanically disconnected from engine and transmission at the transfer case.

But agree, could be done, but all you need is one very small glitch in the electronics to destroy your car and maybe your motorhome. As of now, don't think Tesla or any EV manufacturer would want to take the chance.

Is there a mechanical connection between the rotor and the stator?

jcussen · 03-04-2019, 10:19 AM

Quote:

Originally Posted by RVPioneer

Is there a mechanical connection between the rotor and the stator?

Hope not, pretty sure if rotor don't rotate, and stator does not remain stationary, you will not have a motor or a generator.

RVPioneer · 03-04-2019, 10:36 AM

Quote:

Originally Posted by jcussen

Hope not, pretty sure if rotor don't rotate, and stator does not remain stationary, you will not have a motor or a generator.

So “direct drive” may not be an accurate definition since an air gap is involved.

What happens when the rotor is allowed to rotate freely for several hours without electrical or magnetic interference?

jcussen · 03-04-2019, 10:59 AM

Quote:

Originally Posted by RVPioneer

So “direct drive” may not be an accurate definition since an air gap is involved.

What happens when the rotor is allowed to rotate freely for several hours without electrical or magnetic interference?

Believe "direct drive" to most people means motor/generator is attached to wheel, with no provision or ability to detach or uncouple the wheel from the motor/generator. Has nothing to do with the gap between the rotor and stator as this is how all electric motors are made.
As far as rotating freely, I would assume that the bearings in the motors and wheels are built well enough and lubricated well enough to withstand 500 hp under full throttle as a motor, and 60 kw as a generator when braking, will be able to freewheel without damage. If you are coming down out of the rockies, good change your motors will be freewheeling for long periods of time. But this is an assumption on my part, only the Tesla design engineers can answer that with certainty.

RVPioneer · 03-04-2019, 12:22 PM

http://greentransportation.info

An interesting read. http://greentransportation.info/ev-q...g/towable.html

Info on towing EV’s is about halfway down.

jcussen · 03-04-2019, 12:53 PM

Quote:

Originally Posted by RVPioneer

http://greentransportation.info

An interesting read. http://greentransportation.info/ev-q...g/towable.html

Info on towing EV’s is about halfway down.

This part is the most interesting.

"All electric car makers recommend towing on a trailer or flat bed. Possibly that is due to overabundance of caution a.k.a. fear of being sued"

RVPioneer · 03-04-2019, 01:05 PM

Quote:

Originally Posted by jcussen

This part is the most interesting.

"All electric car makers recommend towing on a trailer or flat bed. Possibly that is due to overabundance of caution a.k.a. fear of being sued"

Or, maybe because it will end badly.

radar · 03-04-2019, 04:47 PM

I think the closest you’ll get is towing a front wheel drive EV like a Nissan Leaf on a tow dolly. Lots of people have done that.

VP Chianese · 03-05-2019, 07:08 AM

Quote:

Originally Posted by RVPioneer

Jeep also has the “death wobble” issue with the 2016 and later MY GC since they switched to electronic power steering.

I believe there is an electronic fix for that. A wire harness and the insertion of a fuse.

It doesn't happen on 2017 and newer GC's.

jcussen, Yes the disconnect is in the transfer case so both front and rear wheels can rotate freely. But I'm pretty sure there is a way to do the same thing to the two direct drive units in programming. They just are not interested.