Slashdot Mirror


Tesla Model S Floats Well Enough To Act As a Boat, According To Elon Musk

It appears a Tesla Model S car can float and effectively drive on water. Tesla CEO Elon Musk tweeted a video of a Model S car which was able to float well through a flooded tunnel in Kazakhstan. Musk also noted that the company "definitely" doesn't recommend trying this -- but still vouched for the availability of this feature. The Guardian reports: The car appears to power through the water using the thrust of the wheels turning in the water, as the bow wave laps over the car's bonnet. Most internal combustion engine cars are sunk in water when the exhaust becomes flooded, which is why serious off-roaders have big exhaust scoops leading to the roof. Electric cars don't suffer from that particular issue, but how the rest of the car will react is unknown.

17 of 238 comments (clear)

  1. Not quite. by Type44Q · · Score: 5, Insightful

    have big exhaust scoops

    Don't you mean "intake snorkel?"

  2. Makes sense by NotDrWho · · Score: 5, Funny

    Teslas have been floating on government subsidies for years.

    --
    SJW's don't eliminate discrimination. They just expropriate it for themselves.
    1. Re:Makes sense by Nethemas+the+Great · · Score: 4, Insightful

      Perhaps they're similar to the ones that float the deep water oil rigs.

      --
      Two of my imaginary friends reproduced once ... with negative results.
  3. Wow the car knowledge here is bad by Anonymous Coward · · Score: 5, Informative

    "Most internal combustion engine cars are sunk in water when the exhaust becomes flooded, which is why serious off-roaders have big exhaust scoops leading to the roof"

    No. Most internal combustion engines are destroyed via hydrolock when (significant) water enters the intake of the engine. Because it can't be compressed, the engine basically explodes internally (pistons, valves, etc, etc). If water enters the exhaust and the engine is running, this is usually not a big deal because the air pressure from the engine will push it back out. Also, the exhaust valves don't suck in air so it will take some serious water pressure to get past those.

    Typically, to combat this, the intake will have a snorkel attached to it and that will be as high as possible, thus preventing water entry into the intake. The exhaust may be raised as well (but that is not absolutely necessary) and this is a serious consideration if the engine is to be turned off while submerged (as then water will enter the combustion chamber through the exhaust valves, hydrolocking when you try to start it again).

    1. Re:Wow the car knowledge here is bad by msauve · · Score: 4, Informative

      "once a Tesla starts taking on water I'd imagine it'd sink like a lithum rock."

      Which is to say, it would still float? Lithium has a density similar to wood (pine).

      --
      "National Security is the chief cause of national insecurity." - Celine's First Law
  4. Actually... by b0bby · · Score: 4, Insightful

    I think this is incorrect:

    Most internal combustion engine cars are sunk in water when the exhaust becomes flooded, which is why serious off-roaders have big exhaust scoops leading to the roof.

    I think the snorkels are intakes, not exhaust - you don't want to suck water into your intake manifold.

  5. Re:Floats unlike Tesla by Rei · · Score: 4, Insightful

    What are you talking about? If you're talking about the suspension issue, the NHTSA investigated and found no problem with Tesla suspensions (and furthermore that 93% of the complaints were fraudulent).

    --
    Monkeywrench Ex Machina.
  6. Jay Leno's take by Okian+Warrior · · Score: 4, Interesting

    Jay Leno had some interesting things to say about Tesla.

    I've noticed the same thing (as Jay): people are falling over themselves to try to bring Tesla down, and I haven't the first idea why.

    GM stock price slumped a whopping 1.3% on news of its ignition recall that was actually killing people.

    Apple hires some engineers with car experience, everyone guesses that they'll be making electric cars, and "OMG, this could be the end of Tesla!" (The stock drops 10% in a day).

    Analyst price targets for Tesla are all over the map, going from $150 to $385.

    Jay mentions that "we like noble failures more than we reward success". I think that's true, but it's also baffling.

  7. Re:Floats unlike Tesla by Anonymous Coward · · Score: 5, Funny

    He's also talking about that one incident where a Tesla ran over a chunk of metal on the highway, resulting in a horrible fire that was isolated to the engine compartment, and required that the driver pull over and shut the car down. (Rather than the much safer standard vehicle alternative of exploding, crashing, and suddenly ceasing to have a working engine while driving at high speeds on a crowded highway). Tesla's total dismissal of the incident is just typical of their head-in-the-sand tactics to ignoring real problems.

    Wake up sheeple!

  8. Re:Floats unlike Tesla by K.+S.+Kyosuke · · Score: 5, Funny

    Hey, whatever floats his car. ;)

    --
    Ezekiel 23:20
  9. Re:the only thing left by Anonymous Coward · · Score: 5, Funny

    Oh good lord, don't give them ideas. Now my model 3 is going to be delayed while they work out the kinks in the flight systems and autopilot.

    I blame you.

  10. Float? Not quite. by kamakazi · · Score: 5, Insightful

    I am sorry, but that car wasn't floating. The wheels and tires on a Tesla are going to have no forward thrust, because the entire wheel will be submerged, meaning the top of the wheel is thrusting backwards just as well as the bottom is thrusting forward.

    The low profile tires on the Tesla are going to have minimal thrust anyway, because the tread is not even vaguely paddle like. For reference look at this video of the bigfoot monster truck floating across a lake. Even that truck with duallies on it (total of 8 monster truck wheels), which did float high enough for the big mudders to act like paddles, didn't make as quick forward progress as an old man in a canoe, and was extremely slow to respond to steering input.

    The tesla in the video not only has enough power to push a big bow wave, it has enough steering traction to slalom through the other cars on the road. The weight of that car was obviously enough to keep the tires on the pavement at that water depth. I am not denying that the Tesla could float, nor am I denying that it may be water tight enough to float well, but it will be pretty much powerless and uncontrolled while floating.

    Mr. Musk is very proud of his car, but on this video I call BS. That is not floating.

    --
    "Proximity to wonder has blunted our perception and appreciation of it" --Tim Hartnell in 'Exploring ARTIFICIAL INTELLI
    1. Re:Float? Not quite. by msauve · · Score: 4, Insightful

      "the entire wheel will be submerged, meaning the top of the wheel is thrusting backwards just as well as the bottom is thrusting forward."

      Except they're not open wheel cars, they have fenders and wheel well liners.

      --
      "National Security is the chief cause of national insecurity." - Celine's First Law
    2. Re:Float? Not quite. by kamakazi · · Score: 4, Informative

      hmm, that is a point. If the wheel stays up in the fender it may act as a very inefficient impeller, taking in water at the rear of the fender opening, the fender liner acting as the casing of a very poorly coupled pump.

      It would work better if it was a fully skirted fender, which they aren't, so most of the water being pumped is going to just blast out sideways, mostly out, because the inside of the wheel well is lower that the outside.

      Just guessing, without modeling, I think the thrust would be mostly down, with some backwards.

      I don't know my Tesla models that well, but if it is AWD any thruster effect from the front wheels would be less, because of the larger wheel well clearances for turning, and would disappear almost entirely when the wheels were turned left or right at all.

      Teslas probably have an advantage in this regard, because they have a pretty taught suspension, and probably won't droop as much as the cars us mere mortals drive, which at full droop can be almost entirely out of the wheel well, below the body of the car.

      You are correct, I had not considered the ducting action of the fenders. However I stand by my final judgement that the car in the video is not floating.

      --
      "Proximity to wonder has blunted our perception and appreciation of it" --Tim Hartnell in 'Exploring ARTIFICIAL INTELLI
  11. Re:Batteries by necro81 · · Score: 4, Informative

    Electronics in automotive environments tend to be very well sealed, because they are exposed to all kinds of crap. Rain is the least of it: snow, salt, sand, mud, marine air, gasoline, motor oil, washer fluid - all of these would utterly destroy electronics if they were not well protected against it. The electronics enclosures, cabling, and connectors used in automobilies are typically rated to IP55 at least, and typically are IP67. Once you have sealed it well enough to keep out all the crap you'd encounter on the road, you get protection against temporary submersion more or less for free.

  12. Re:Floats unlike Tesla by thegarbz · · Score: 4, Insightful

    Thank you for your opinion Anonymous Coward. But I'll go with what the NHTSA, and NCAP say about it instead. Not that I don't value your opinion, just that it's utterly wrong and worthless.

  13. If someone steals a Tesla... by Khyber · · Score: 5, Funny

    ...do we then call it an Edison?

    --
    Still waiting on Serviscope_minor to wake up to fucking reality and realize that Jessica Price isn't going to fuck him.