tesla roadster fan car patentDownload It has the fans and the side skirts, just as one would expect. And it shows the rough design of what the system might look like – a hexagonal-ish shape underneath the vehicle, with fans presumably at the rear of the vehicle to exhaust air to create the vacuum effect. Tesla goes on to say that these skirts and fans could be controlled automatically by vehicle systems in order to offer different performance benefits in different situations. This is where we start to see the new tech – like adding the modern concept of active aerodynamics to the concept of fan cars. Rather than deploying the skirts the same way in all modes, there could be different modes for a prepared track surface which is known to be high quality and flat, or for a more uneven road surface where you might not be able to create as secure of a seal with the maximum-downforce configuration. This is an issue with fan cars – they only work on the right kind of surface. If air leaks in to the vacuum region under the vehicle, you can’t really create as much negative pressure as you’d like. That’s why the side skirts are necessary, but of course that doesn’t work if there are potholes, unsecured manhole covers, and the like. Tesla also says the system could have different configurations for low- and high-speed operations, adjust the skirts based on vehicle weight transfer, or potentially detect upcoming road conditions and modify configuration based on what the car sees ahead. And mention of deploying the skirts based on GPS position lends itself to the idea that Tesla could create specific settings to optimize performance for track use, or even individual corners on tracks. Is this the “SpaceX Package,”or something else? Tesla has said for years that the Roadster would have a “SpaceX package” to increase the performance even further than the specs it mentioned in the original unveiling event. This was meant to use expertise from SpaceX, another company Musk runs, and whose primary facility is sited on the same Hawthorne, CA property as Tesla’s Design Studio. At least one of the designers listed on Tesla’s “fan car” patent, David Lemire, worked at both Tesla and SpaceX in the past, before leaving and then returning to Tesla as a senior engineer on Tesla’s “new programs” team. However, there is no mention in the document of “fly,” “flight,” “thruster,” “rocket” or “lift.” Nothing like the “cold gas thrusters” package that Musk has spent years telling us will make the car fly – and in fact, the exact opposite, as this will suck the car to the ground, not make it fly at all. This could mean that Tesla has another idea in mind which will use thrusters, and will be applied in addition to this “fan car” idea. Theoretically, adding lateral thrusters around the car could still add a performance benefit over and above the fan car idea, so these could be used in tandem, though it would add a lot of complexity to the vehicle. But these may or may not be worth the added weight – and they definitely wouldn’t be worth the weight if they’re directed in such a way to make the car able to “fly.” Or it could be that the “fan car” patent will be applied to cars like the Model S Plaid, which has set racing records, and Tesla has another trick up its sleeve for the Roadster. Or… this is what the SpaceX package was all along, and Musk was just running his mouth about the car flying. Which would be the best option, to be honest, because it’s dumb to pretend that flight would add any performance benefits to a sportscar. Regardless, the fan car idea is an actual interesting performance idea, and it would actually work, unlike some of the previous public statements made by Tesla’s CEO. So it’s nice to see some sort of progress that could be applied to a performance car, after so many years of waiting. But… does it matter anymore? With so many performance EVs, does this matter? The problem is that in the intervening 8 years since the Roadster was first introduced, some other electric cars with truly wild specs have already hit the road, and have delivered the “hard core smack down” that Tesla promised. We’ve got the Rimac Nevera R, a 2,078hp electric car that can hit 300km/h (186mph) a full 3.5 seconds faster than a Bugatti Chiron Super Sport. We’ve got the Lotus Evija X, which set the third-fastest Nurburgring lap ever, only beaten by two one-off, track-only, purpose-built racecars (one of which is a hybrid, the other is electric). And in the realm of actual consumer-available vehicles, we have the Xiaomi SU7 Ultra – made by a smartphone company, mind you – with 1,548hp and record-setting performance of its own. So anybody who tells you these days that EVs aren’t fast is just… embarrassingly wrong. They’ve had their head in the sand for at least 19 years. It’s honestly a bit boring at this point. So, what’s left for Tesla to do? The smack down has been delivered, and delivered by many other companies, startups and otherwise. I mean, heck, we’ve got a company that went from making phones to beating Porsche on its home track in the course of less than three years worth of development. Everyone is aware of how easy it is to beat complex, inefficient gas engines at this point. A fan car seems like it could be a worthy addition to this menagerie, another way to deliver the smack down, as none of the above EVs have leveraged this particular type of active aerodynamics for a performance benefit, so Tesla could have something unique here….. oh, wait. It turns out that someone else has done an electric fan car already. The McMurtry Spierling already has this idea, and it’s an absolute beast. It’s already the fastest car ever at Goodwood thanks to the 2,000kg of downforce that it makes with the huge fans underneath the roughly 1,000kg vehicle, even at 0mph where traditional aerodynamic surfaces provide no benefit whatsoever. And if it seems interesting that one of those numbers is bigger than the other, well, yes, McMurtry has done that too – it briefly drove the car upside down just to show off how much downforce its fans can make, which we would say might qualify as “the most epic demo ever.” That said, the Spierling is just one application of the idea, and it’s not like more cars can’t try something similar. Also, it looks like Tesla’s solution would add a lot of adaptibility that McMurtry’s doesn’t have. Not only is the Spierling a purpose-built, track-focused single-seat racecar whereas the Roadster would be a regular roadgoing sportscar, but also Tesla’s flexible solution described in the patent would allow travel on less track-prepped terrain. This would make the concept of a fan car much more practical for real life – as long as you’re not somewhere where you wouldn’t want to spray high-velocity pebbles out of the back of your vehicle. Maybe there’s a reason nobody has done this on a consumer vehicle yet (that said, Tesla includes a filter to stop the spray of dust and pebbles in the patent). But in terms of real-life applications, there is also the consideration of driver skill. Drivers of performance vehicles get used to their car’s limits and learn where those limits are. But with a presumably enormous amount of adjustable downforce, those limits could change drastically based on road conditions. Top comment by RDLink