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Tesla Roadster

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421–430 of 729 posts

Re: Tesla Roadster

#421
post #366

Earlier quoted context omitted.

From Wikipedia's F1 page [0]: > The 2016 F1 cars have a power-to-weight ratio of 1,400 hp/t (1.05 kW/kg). Theoretically this would allow the car to reach 100 km/h (62 mph) in less than 1 second. However the massive power cannot be converted to motion at low speeds due to traction loss and the usual figure is 2.5 seconds to reach 100 km/h (62 mph) Even adjusting for 60 mph = 2.4s, I don't see how the traction of the T…

I agree, I think this is another case of "well it works on our computer" pre-release specs that will turn out not to get close to real-world performance. The 0-100mph is very suspicious but I think the 0-60 time quoted is simply impossible for a road car, even making allowances for a few years of tech advancements. F1 tires are nothing like road tires. They're not even vaguely comparable - at normal operating tempera…

[deleted]

Re: Tesla Roadster

#422
Hmmmmm. Tesla seems on the edge of imploding, financially.

Then they announce this. (With reservations starting at $200k.)

I wouldn't put retirement money on that one.

Re: Tesla Roadster

#423
post #366

Earlier quoted context omitted.

From Wikipedia's F1 page [0]: > The 2016 F1 cars have a power-to-weight ratio of 1,400 hp/t (1.05 kW/kg). Theoretically this would allow the car to reach 100 km/h (62 mph) in less than 1 second. However the massive power cannot be converted to motion at low speeds due to traction loss and the usual figure is 2.5 seconds to reach 100 km/h (62 mph) Even adjusting for 60 mph = 2.4s, I don't see how the traction of the T…

I agree, I think this is another case of "well it works on our computer" pre-release specs that will turn out not to get close to real-world performance. The 0-100mph is very suspicious but I think the 0-60 time quoted is simply impossible for a road car, even making allowances for a few years of tech advancements. F1 tires are nothing like road tires. They're not even vaguely comparable - at normal operating tempera…

There are no gears in an electric car, and doesn’t more weight make it easier to stay on the road, not harder?

Re: Tesla Roadster

#425

No side view mirrors! That helps tremendously with aerodynamics. I wonder if they used cameras and displays. Even the new Ford GT has mirrors.

Let's see if that makes it from prototype to production, though; if you could meet the legal requirements with cameras and displays I think someone else would have done it by now.

Concept cars often lack mirrors, or have ridiculously small mirrors that wouldn't be legal. Apparently car designers really just don't like adding them.

Re: Tesla Roadster

#426

There has got to be an astroturfing campaign going on here, or the HN crowd is a lot more naive than I thought. Seriously, no one is concerned that Tesla is announcing, not one, but two new products, while they are failing to deliver on all three they are currently producing (in terms of production ramp-up)? What matters more than anything to Tesla is production at scale, but they are busy promising ever more fantast…

Elon Musk has a decade of track record. Model 3 will eventually be delivered. My point of contention with TSLA is that the stock price does not match the up-side, but sooner or later Tesla always delivered. They will learn and deliver, I have seen reviews of Model 3, the average delivered vehicle will cost around 50K no doubt, but its worth every penny of it. Model 3 is not every man's car, but again a used Model 3 c…

I would say vision is comparable to Jobs, but execution— not yet. The problem is a lack of focus and a lot of distraction with big public announcements before actually figuring out how to ship. Jobs (and Cook’s) advantage over Musk in the Tesla context is that they considered the supply chain as vital as the flash and sparkle. Supply chain isn’t sexy but it’s essential. Tesla’s supply chain is fragile to say the least and should be focused upon. Musk’s execution isn’t there yet. Jobs created/launched an iPad and it shipped millions. Waiting times for an iPhone rarely have exceeded a few weeks because their supply chain is solid. But getting a replacement fender for a Model S? Good luck with that.

If I were a Tesla investor, the only thing I would care about is supply chain efficiency. We know Tesla can innovate and titilate — but can they ship?

My advice to Musk would be: announce things after you can ship them reliably and at scale. Less sparkle more shipping. Prove you can ship the 3, then I might be confident you can ship a truck.

I really like Musk and Tesla, but there is a hell of a lot more involved with changing the world than creating essentially limited edition concept cars — you actually have to ship. Based on the 3, it’s clear that there are some execution issues that still need solving.

Re: Tesla Roadster

#427
Electric motors are absolutely better compared to combastion engines. But Guys, please don't compare apple to oranges. Tesla is no match to Ferrari nor McLaren. Ferrari's main intention is to build a car that has a good cornering on track. 0-60 is for muscle cars which you can compare to SRT Demon. All these Bugattis, Koenigseggs are a bunch of unsteerable rockets on tracks. Last but not least you know how Koenigsegg ended up in Nordschleife.

Re: Tesla Roadster

#428
post #366

Earlier quoted context omitted.

From Wikipedia's F1 page [0]: > The 2016 F1 cars have a power-to-weight ratio of 1,400 hp/t (1.05 kW/kg). Theoretically this would allow the car to reach 100 km/h (62 mph) in less than 1 second. However the massive power cannot be converted to motion at low speeds due to traction loss and the usual figure is 2.5 seconds to reach 100 km/h (62 mph) Even adjusting for 60 mph = 2.4s, I don't see how the traction of the T…

I agree, I think this is another case of "well it works on our computer" pre-release specs that will turn out not to get close to real-world performance. The 0-100mph is very suspicious but I think the 0-60 time quoted is simply impossible for a road car, even making allowances for a few years of tech advancements. F1 tires are nothing like road tires. They're not even vaguely comparable - at normal operating tempera…

> F1 tires are nothing like road tires.

Agreed, but they don't need to be. Remember, the magic number here is ~1.4G, for a 1.9s 0-60. The Pilot Sport Cup 2 – a track-friendly R-compound tire used in the webcast car and in the videos – can pull close to that on a skidpad (i.e. less than optimal conditions), meaning the grip is there.

> I think it's straining credulity to believe that an electronic traction control system is going to outperform them to such a huge degree.

Launch control and traction control can make several tenths of seconds of difference, which is critical when you're talking about sub-2s times. Also, traction control can keep the car on the cusp of slip the entire run to 60MPH, which is critical in a car that has a completely flat torque curve and probably enough torque to break the wheels loose at any speed (which is not true for F1 cars).

I also suspect that the Roadster has active damping – another technology disallowed in F1 – meaning that the duration of contact with the road can be maximized. This is important if the road surface isn't glassy-smooth.

> This car also looks to weigh around double what an F1 car will weigh

That doesn't help it at all in cornering, but in a straight line, the increased weight of the car will help it launch even better since it'll increase the traction on the drive wheels (equivalent to downforce at speed).

> Gear changes: F1 gear changes take about 8 milliseconds. A road-going automatic gearbox is definitely not going to beat this.

There's no gearbox to speak of; the wheels are direct-drive. To be fair, this won't contribute significantly to faster 0-60 times, but the gearbox exists to compensate for some less-than-ideal characteristics of an ICE, namely uneven power delivery and physical limitations on peak RPMs. An electric motor has none of these problems.

Re: Tesla Roadster

#429
post #68

Close up video of Tesla Roadster launching from zero: https://twitter.com/DavidHodge/status/931391188065705984

Hey folks. I was the one that took that video. let me know if you have any questions.

For people like me:

https://www.youtube.com/watch?v=y2R3FvS4xr4

Re: Tesla Roadster

#430

There has got to be an astroturfing campaign going on here, or the HN crowd is a lot more naive than I thought. Seriously, no one is concerned that Tesla is announcing, not one, but two new products, while they are failing to deliver on all three they are currently producing (in terms of production ramp-up)? What matters more than anything to Tesla is production at scale, but they are busy promising ever more fantast…

> Seriously, no one is concerned that Tesla is announcing, not one, but two new products, while they are failing to deliver on all three they are currently producing (in terms of production ramp-up)?

I dunno man, every time before I've said "Tesla/SpaceX can't possibly do that", they've succeeded in doing it (albeit usually a year or so behind schedule) so I've given up trying to tell them what they can't do.

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