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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: freds on February 07, 2020, 07:36:54 PM

Title: Drafting???
Post by: freds on February 07, 2020, 07:36:54 PM
Hi Everyone

I brought a Tesla for my 60th birthday (it's paid for now) and took it back to Greybull WY to show it to my cousin. At the time the I-90 super charger network east bound quit at Spokane WA until you were a lot further east.

To make it I stopped at a lot of RV areas to snag a 50amp outlet for an hour or more to add 50 miles of range.

I made it into Missoula MT with three miles remaining of range only by drafting behind a semi-truck for a fair number of miles. Was definitely thinking that a tow truck would be involved that day!!!

I wound up at a motel where they let me unplug a dryer which was on two phases on three phase power so only got 192 volts instead of 240, so it took about 12 hours to charge the car where normally it would take a little over eight hours on a fully empty battery.

Question, can you significantly improve your mileage by drafting a semi?

Title: Re: Drafting???
Post by: DoubleEagle on February 07, 2020, 08:07:12 PM
Yes you can, if you are within 8' or so, but doing that might decrease your personal lifetime. :o
Title: Re: Drafting???
Post by: Nova Eona on February 07, 2020, 09:00:22 PM
You can also get anywhere you're going twice as fast just by doubling your speed, but there are certain flaws in both approaches.

A lot of people tend to think that the semi slamming on the brakes unexpectedly is the worst case for these scenarios, but think about the mechanical disasters that could happen - what's your reaction time if the trailing axle pops loose and suddenly gets punted your way?

Personally when driving a little car I like to give the big trucks as much room as possible - I don't even like being alongside them, let alone directly behind them.
Title: Re: Drafting???
Post by: buswarrior on February 08, 2020, 04:36:31 AM
Drafting works.

But, no time to react for road debris.

Also can't see the local authorities at roadside until too late, who will be "curious" to inquire as to your following distance...

Happy coaching!
Buswarrior
Title: Re: Drafting???
Post by: Jim Blackwood on February 08, 2020, 06:53:46 AM
If a semi driver sees a 'gator' in the road he'll probably straddle it. Where does that leave you? Broken probably and maybe wrecked.

Jim
Title: Re: Drafting???
Post by: lostagain on February 08, 2020, 07:31:16 AM
The short comings of electric vehicles that you describe are the reason I would not buy one.

Tail gating is illegal, for good reasons.

JC
Title: Re: Drafting???
Post by: freds on February 08, 2020, 08:33:47 AM
Quote from: lostagain on February 08, 2020, 07:31:16 AM
The short comings of electric vehicles that you describe are the reason I would not buy one.

Tail gating is illegal, for good reasons.

JC

Oh that was in the early days. It's not a problem now, just returned from a 2400 mile trip and had no problems due to Tesla's vast network of super chargers.

Some of the stations have high power chargers for other brands of cars though not many actual charge positions. I was at a station where there was ten Tesla spots and two other type spots...
Title: Re: Drafting???
Post by: TomC on February 08, 2020, 10:24:17 AM
My wife followed me in a rental straight truck. Her mileage at freeway speed normally is around 30. But her average was 50 with drafting.
Title: Re: Drafting???
Post by: Jim Blackwood on February 09, 2020, 08:19:00 AM
If you went 1000 miles you saved 13.3 gallons of gas. At current prices that's about $30. Is that all your life is worth?

Jim
Title: Re: Drafting???
Post by: Knuckles on February 09, 2020, 08:59:52 AM
Drafting works but you not only need to worry about road debris coming your way but i drove truck for forty years and can't even count the amount of blowouts I've had on trailers and the tire is the least of your worrys on some trailers the explosion has blown the fenders right off the trailer as well as the tire gator definitely not worth your life. Its like following a bomb not knowing when the thing will detonate
Title: Re: Drafting???
Post by: chessie4905 on February 09, 2020, 09:33:03 AM
The benefit of all electric looks promising now, at least for short trips unless you want to spend the time waiting for a charge and stress of finding a charging station when needed that isnt out of order. It is just a matter of time before the savings start to evaporate. Governments are and will start taxing for not paying fuel road tax, charging fees will start rising, on and on. Diesel used to be a bargain in my cars several years ago. It was cheaper than gas. That changed when they started raising the road tax. Now diesel competes with premium gas on cost.
Title: Re: Drafting???
Post by: Boomer on February 09, 2020, 10:35:12 AM
Nuts!
Title: Re: Drafting???
Post by: freds on February 09, 2020, 11:52:38 AM
OK guys, I get it that it's a bad idea thanks for weighting in.

Though the big truck firms have plans for automated driver assist with convoying using drafting on multiple trucks. Whether that will be legal or work is still up in the air.
Title: Re: Drafting???
Post by: Nova Eona on February 09, 2020, 05:43:00 PM
Oh it will be amazing for autonomous convoying - I wouldn't be surprised at all to see an 'autonomous only' lane on big highways in the future that's a bumper-to-bumper mix of vehicles going at speeds that we'd consider reckless today, but that demands much tighter precision and coordination than our lame human brains can manage.

Electric's definitely the way of the future - honestly the biggest problems are lack of infrastructure and that our battery tech is several steps behind our motor tech, but they're making advancements every year.  Even once road tax and such all get leveled out, eventually gas and diesel will be the 'hobbyist' options.
Title: Re: Drafting???
Post by: richard5933 on February 09, 2020, 09:32:26 PM
I see EVs becoming the majority of new vehicles sold much sooner than self-driving ones. Electric and ICE can co-exist easily, but as long as humans are behind the wheel of some vehicles it will be difficult to mix the technologies of self-driving and human-driven.

We humans have a tendency towards doing things irrationally, which makes it difficult for self-driving vehicles to predict our actions. Self-driving cars on a road by themselves could work in close quarters at high efficiency, but the safety margin they have to leave to allow us humans working space would take away from that. That said, I do see where HOV lanes will soon be replaced with self-driving-vehicle-only lanes which are isolated from the regular traffic. Then they can talk to each other and operate at full efficiency.
Title: Re: Drafting???
Post by: Lee Bradley on February 10, 2020, 07:06:32 AM
Quote from: richard5933 on February 09, 2020, 09:32:26 PM
I see EVs becoming the majority of new vehicles sold much sooner than self-driving ones. Electric and ICE can co-exist easily, but as long as humans are behind the wheel of some vehicles it will be difficult to mix the technologies of self-driving and human-driven.

We humans have a tendency towards doing things irrationally, which makes it difficult for self-driving vehicles to predict our actions. Self-driving cars on a road by themselves could work in close quarters at high efficiency, but the safety margin they have to leave to allow us humans working space would take away from that. That said, I do see where HOV lanes will soon be replaced with self-driving-vehicle-only lanes which are isolated from the regular traffic. Then they can talk to each other and operate at full efficiency.

No. They will take another general traffic lane; HOV plus self-driving vehicles lanes.
Title: Re: Drafting???
Post by: lvmci on February 10, 2020, 08:10:46 AM
At Hoover Dam Freightliner, Detroit and Benz had a huge worldwide introduction of the first State licensed driverless 18 wheeler. Happened About 5 years ago, this big show talked about how the driver would have a dash board that had two removable Ipads, that communicated thru a satellite dish on the roof, making the driver the manager of the load, communicating arrival, pickup, weather issues, etc. Funny that the Dam people wouldnt let the truck drive itself for the movement across the Dam. For me it was also a personal event, as it was the first time my son and I worked together! He was the lighting director, lvmci...
Title: Re: Drafting???
Post by: richard5933 on February 10, 2020, 08:25:37 AM
Quote from: Lee Bradley on February 10, 2020, 07:06:32 AM
No. They will take another general traffic lane; HOV plus self-driving vehicles lanes.
Not around here - we just don't have any extra lanes. Maybe in states/cities with super wide freeways, but that's not what you'll find on freeways going through many cities in the north/east.
Title: Re: Drafting???
Post by: Jim Eh. on February 10, 2020, 10:25:21 AM
Quote from: Nova Eona on February 09, 2020, 05:43:00 PM
Oh it will be amazing for autonomous convoying - I wouldn't be surprised at all to see an 'autonomous only' lane on big highways in the future that's a bumper-to-bumper mix of vehicles going at speeds that we'd consider reckless today, but that demands much tighter precision and coordination than our lame human brains can manage.

Electric's definitely the way of the future - honestly the biggest problems are lack of infrastructure and that our battery tech is several steps behind our motor tech, but they're making advancements every year.  Even once road tax and such all get leveled out, eventually gas and diesel will be the 'hobbyist' options.

Funny thing is, they are already here, by your definition above. They are called trains. Although in North America, the overhead electrical lines have not yet been installed.
Title: Re: Drafting???
Post by: uncle ned on February 10, 2020, 10:50:16 AM



I hear that the new Prevo's are that way.

The front guy just pulls the rest along.

The guys behind set their cruse a few miles faster and just set in the drivers seat.

uncle ned
Title: Re: Drafting???
Post by: Jim Blackwood on February 10, 2020, 12:41:42 PM
Quote from: Knuckles on February 09, 2020, 08:59:52 AM
Drafting works but you not only need to worry about road debris coming your way but i drove truck for forty years and can't even count the amount of blowouts I've had on trailers and the tire is the least of your worrys on some trailers the explosion has blown the fenders right off the trailer as well as the tire gator definitely not worth your life. Its like following a bomb not knowing when the thing will detonate

I once was about 50 ft away from a blowout, driving a convertible sports car, luckily in front of it. It was like a bomb going off. Had I been beside it I would be dead. I've learned a healthy respect.

Now those car/truck trains probably are the wave of the future but there will be a cost, just like with the original steel rail. Check your history, they were very deadly. But so were stage coaches. And when cars came about, so were they. It's only been in the last few decades that we could call them relatively safe, hurrah for crash test dummies! We used to call them Darwin victims. The ultimate expression was to strap your butt to a massive explosive and light off for the moon. But we will always push the envelope. And like complete idiot morons we ask, "What could possibly go wrong?" Second only to, "Hey, hold my beer and watch THIS $#!%."

So, truck trains. What do you think is going to happen when the lead truck sheds a gator? Weird things, you can guarantee it. Stuff that will make human erratica look like playschool. That's just the beginning. How about a suicide bomber in a Corolla? Yeah, I can't see that ending well. And that's if it's just trucks. You want to intersperse cars in there as well? Not me buddy. The one irrevocable rule of nature is that you don't argue with someone bigger than you are and that applies equally well to our artificial life forms. Does a sane person step out  in front of a freight train and expect it to stop for them? No he does not. OK that's an extreme example sure, but it still applies. If you want to take those chances you had sure better know exactly what you are doing. And when it comes to autonomous vehicles there's still an awful lot that we just don't know.

Not that any of that will stop us, but we should proceed cautiously lest we return to the bad old days of railroad expansion when your chances of getting there safe were about the same as with bandits, indians and stage coaches.

Jim
Title: Re: Drafting???
Post by: richard5933 on February 10, 2020, 02:46:58 PM
I've driven a few cars with some of the new self-driving features. Not full-blown self driving, but things like lane correct and reactive cruise.
The one thing that I do really like is the reactive cruise. That thing does a better job of keeping distance to the car in front of me than I ever could. Once the cars start talking to each other, I can see where in designated lanes the cars follow at a pre-set distance and are able to maintain things much better than we all do in heavy traffic when cars are going 60+ only a few feet from each other. That computer system has better reflexes than the average guy who's shaving or eating on the way to work in the morning rush.
Title: Re: Drafting???
Post by: AndyinCT on February 10, 2020, 05:18:29 PM
Quote from: freds on February 07, 2020, 07:36:54 PM
Hi Everyone

I brought a Tesla for my 60th birthday (it's paid for now) and took it back to Greybull WY to show it to my cousin. At the time the I-90 super charger network east bound quit at Spokane WA until you were a lot further east.

To make it I stopped at a lot of RV areas to snag a 50amp outlet for an hour or more to add 50 miles of range.

I made it into Missoula MT with three miles remaining of range only by drafting behind a semi-truck for a fair number of miles. Was definitely thinking that a tow truck would be involved that day!!!

I wound up at a motel where they let me unplug a dryer which was on two phases on three phase power so only got 192 volts instead of 240, so it took about 12 hours to charge the car where normally it would take a little over eight hours on a fully empty battery.

Question, can you significantly improve your mileage by drafting a semi?
Fellow tesla owner here!  S 85D
I dont know about drafting as I too have been near a semi when a tire has exploded.  Scared the $&!@ outta me!  But, I can tell you using the heat kills the battery quickly!  In fact, cold weather really does a number on range. 
I still love it though.  IMO Tesla is a software company that just happens to make cars.  Thats why they're so good.  LOVE it.  A lot.  Enjoy freds!
Title: Re: Drafting???
Post by: Boomer on February 11, 2020, 09:23:35 PM
With self driving vehicles who the hell is going to put chains on?  What happens on snow and ice? These auto pilot tesla's are crashing almost as much as stupid drivers.
Title: Re: Drafting???
Post by: chessie4905 on February 12, 2020, 04:16:36 AM
Who the hell is going to need chains??? The global warming is going to send snow and ice to the bin of past memories.
Title: Re: Drafting???
Post by: dtcerrato on February 12, 2020, 05:55:30 AM
Quote from: chessie4905 on February 12, 2020, 04:16:36 AM
Who the hell is going to need
chains??? The global warming is going to send snow and ice to the bin of past memories.
It already has here in Florida - unlike past 40 years with frost, snow, & icicles - now insect populations stay around all winter today Is 85F - 1-1/2 hrs south is 88F in Orlando. :-/ February...!
Title: Re: Drafting???
Post by: kyle4501 on February 13, 2020, 05:00:57 PM
Self driving sounds good - But what happens when the controls get confused due to a failed component or two?

I was driving a company car for work - when the traction control system drove the car right off the road into the woods when it got confused in a rainstorm. The computer told the story of what it did to steer off the road - just not why it decided to do that. 

Same thing happened to two other guys with that same car. Was so glad when they got rid of it.
Title: Re: Drafting???
Post by: uncle ned on February 14, 2020, 08:06:09 AM


Good morning Kyle

uncle ned
Title: Re: Drafting???
Post by: freds on February 14, 2020, 10:21:42 AM
Quote from: Boomer on February 11, 2020, 09:23:35 PM
With self driving vehicles who the hell is going to put chains on?  What happens on snow and ice? These auto pilot tesla's are crashing almost as much as stupid drivers.

The press and the short sellers make sure you hear about every auto pilot accident thus altering the perception.

Recent numbers release:

"During Q3, we registered one accident for every 4.34 million miles driven in which drivers had Autopilot engaged. This compares to the national average of one accident for every 0.5 million miles based on NHTSA's most recent US data."

Now if we converted express lanes to automated driving only they would truly be express lanes!!!


Title: Re: Drafting???
Post by: buswarrior on February 14, 2020, 07:23:44 PM
What fred said.

The automation isn't going to stop the killing, its just going to do a lot less killing than people do.

Those of us with the hesitant nature, due to experience of the "blue screen of death" are just going to have to get over ourselves?

Happy coaching!
Buswarrior
Title: Re: Drafting???
Post by: Jim Blackwood on February 15, 2020, 05:27:37 AM
I'd try to avoid getting in a big hurry about it. As with all emerging technologies the early adopters are the ones to pay the highest prices and in this case that cost includes the injury and fatality statistics. It is dead certain that the overeager engineers pushing the new tech will jump right in with both feet and you can get a direct comparison to the way all new products are introduced to the marketplace. Example: Will they start out with overly conservative following distances until it is proven that they can shorten them up? No they will not. You can expect to see things like 10ft bumper-to-bumper distances because, "The software is capable of reacting within inches so that is more than enough." until it is proven not to be, at the cost of numerous fatalities.

Sorry, that's just the way it's done. How many times have you seen stop signs planted only after a half dozen people have been killed?

Jim
Title: Re: Drafting???
Post by: DoubleEagle on February 15, 2020, 07:37:52 AM
Maybe the "engineers" that developed the software for the 737 Max won't be involved, and everything will work out okay.  ::)
Title: Re: Drafting???
Post by: Nova Eona on February 15, 2020, 05:34:32 PM
By and large, I'm certain developing a safe driving autonomous electronic system will turn out to be much easier than doing so with an organic system.
Title: Re: Drafting???
Post by: kyle4501 on February 16, 2020, 09:50:40 AM
The organic system would work better if they didn't pass out driver's licenses like candy. . . . .

I would have more faith in the autonomous electronic system if there was a better technical repair network. Amazing to me how fast the dealer wanted to replace the wiring harness yet refuse to simply replace the broken connector housing.
If something doesn't change - soon, nothing will be repairable.