Thursday, August 10, 2017

WSC 2017 Update: August 10th

We lost another team off the official teams list this week: Proton (the new team from Sudan) has been removed, so we're down to 44 entries.

Three teams unveiled this week (RVCE, NIT, and ITU) - and Siam Tech took their Cruiser car for a public test drive.

We also have five more scheduled unveiling events on the calendar: Blue Sky on August 14th, NWU on the 22nd, JU on the 28th, and both WSU and Adelaide University on the 29th.

Challenger Class

Status: Unveiled! Michigan unveiled Novum on July 7th.

No news this week.

Status: Unveiled! Nuon unveiled Nuna 9 on July 25th.

Not much news this week; the team has been posting some testing videos to Facebook.

The team posted a nice photo of Nuna8 and Nuna9 together, with the big trophy lurking in the background...

Photo: Jorrit Lousberg
(image source)


4: Antakari

No news this week.

7: Adelaide University

Status: Unveiling scheduled. The team has announced that Lumen II will be unveiled on August 29th.

No news this week.

8: Punch Powertrain

Status: Unveiled! Punch unveiled Punch Two on June 21st. It will ship for Australia around August 20th.

The team has been doing a fair amount of testing, including a fair amount in the rain; they've posted a video to their own YouTube. I also spotted a news article with a video - there's a shot around 1:27 that gives a clear view down the tunnel:


There's a very strange structure in the driver compartment right now - a galvanized pipe structure around the driver's head. You can see it starting at 1:15 in their YouTube video, and again at 1:38. It's apparently hinged at the top, to allow the driver to get out. You can see how it fits around the driver for 10 seconds starting at 1:30 in the news video.

On the one hand, I like to see teams make a bigger commitment to protecting the driver's head - and if there's any team that knows why, it's Punch. On the other hand... it's an extremely crude part, and I really doubt that it's a part that will be installed on the car in Australia. While I hope they show up to WSC with a better version of it, I suspect it's just a temporary measure to comply with requirements of the circuit that they're testing at.

Finally: Look, Michigan! A team showing off their wheel spats!

so secret!

10: Tokai

No news this week. With Proton out, this is the very last Challenger team for which we have zero details. They unveiled their car on August 27th (a Thursday) in 2015 and didn't announce the date until two days ahead of time, so I don't expect any news for at least two more weeks.

No news this week.

15: WSU

Status: Unveiling scheduled. WSU announced an official unveiling date: August 29th.

Not too much news this week - more car painting, and the first of what appears to be a series of team member interview/pop quiz videos.

16: Stanford

Status: Unveiled! Stanford unveiled Sundae on July 1st.

The team is really going all-in on the ice cream sundae theme. They've also been out doing their first test drive. In a comment on this Instagram post, the team mentions that the car is scheduled to ship at the end of August.

(Crow's landing airfield! Geez, that takes me back...)

18: UiTM EcoPhoton

Not much this week - the team was featured in a news article, but there aren't really any details about the team's progress. However, it looks like there were some construction photos in the print version that didn't make it onto the web version.

20: Durham

Status: Shipped! Durham shipped their car to Australia on July 18th.

No news this week.

21: Twente

Status: Unveiled! Twente unveiled Red Shift on June 23rd.

The team has been doing a lot of testing - they posted a video featuring some shots when the car was at a wind tunnel back in early July, as well as some newer driving shots. They've also posted a video from a race simulation, including some driving on public roads. It was a full simulation, up to and including fake control stops with fake timing sheets. Maybe I shouldn't read anything into how they ordered the teams ;)

Protip, everyone: talk to your videographers! Tell them about what you do - and don't - want them to shoot. When you don't talk to them, you'll end up having to blur out a quarter of the frame on large parts of a finished video (I'm really curious what they think we could make out inside the car from this drone shot that got blurred as well).

Finally, the team has announced that the car will ship to Australia around August 17th - near the end of next week.

22: MDH

Status: Unveiled! The team unveiled way back on May 31st.

Last week, I missed a video on both their Facebook and Instagram of the chassis doing a slalom test - apparently from earlier in the spring. The video quality on Facebook is potato-like, and while the Instagram one is much crisper, IG defaults to cropping to a square format so the best views of the front suspension are missing (general request to everyone, host your videos on a real video platform, please?)

Video issues aside, we can see a lot of details. The battery is mounted low and behind the driver. The rear suspension is a swingarm setup with each swingarm cantilevered out and down into the bottom of the fairings. Dual rear motors, too, if I'm not mistaken. I'm scratching my head a little over the front suspension, though. It looks like a un-suspended upright, perhaps with a leading swingarm mounted to it? And although it has a fair amount of positive caster, it looks like the axle is raked far enough forward that the steering has negative trail. Really strange...

Finally, the team also posted a photo from when they were manufacturing the chassis utilizes a welded tube steel structure for the driver compartment, but also makes use of bolted-together rectangular aluminum tubing for the cantilevered suspensions mounts.

25: Nagoya Institute of Technology

Status: Unveiled! The car was shown testing at Bridgestone's test track on July 15th, and was formally unveiled on August 6th.

Last week, the team competed at Suzuka with their previous car, Horizon Z. They tied for 3rd in the Olympia Class, with 60 laps overall. After the race, the team unveiled their new car, Horizon 17. With the array on, we can see exactly how dramatic the "surfboard" shape on the top is. It's definitely more dramatic than Stanford's Sundae, and I think it's (proportionally) narrows further at the rear than Nuon's Nuna9.

(image source)
(image source)
(image source)

Looking sharp!

28: Neul-Hae-Rang

Status: Unveiled! The team unveiled Woong-bi on June 25th.

No news this week.

29: Siam Tech (Edison)

The car looks more complete every day, and the team is posting a LOT to Facebook. The team was test driving the chassis late last week (in the dead of night, as is tradition for a first drive). This week the lower shell has been installed.

32: Principia

Status: Unveiled, and Shipped! There wasn't a formal unveiling event, but Principia took Ra X to Formula Sun in Texas, July 3-8. The team shipped the car to Australia on August 1st.

No news this week.

34: RVCE

Status: Unveiled! The team unveiled Arka right on schedule on August 5th.

Arka
(image source)

It's not a particularly noteworthy car, but it's a huge step up from where the team was two years ago.

37: Goko High School

Along with NIT, Goko competed at Suzuka this past weekend with their older car - the version of Musoushin that competed at WSC in 2015. I didn't manage to find a good image of it, but you can see it on the starting grid at 5:18:17.

38: North-West University

Status: Unveiling scheduled. Public unveiling of Naledi is scheduled for August 22nd.

No news this week.

43: Australia National University

The team posted a small video of a team member spinning around their CAD model. Notably, the driver is now placed on the right - the previous rendering had the driver on the left. Another change is that the gap between the rear right wheel fairing and pod for the front right wheel + driver appears to be much smaller than in the previously released renders. It's narrow enough that I'm really not sure what the point is anymore...

46: Jonkoping University

Status: Unveiling scheduled. The team has announced that Solveig will be unveiled on August 28th.

No news this week.

70: Sonnenwagen Aachen

Status: Unveiled! The team unveiled Huawei Sonnenwagen on July 20th.

Not much news this week - a pair of posts about donations from sponsors on their social media.

71: Istanbul Technical University

Status: Unveiled! The team unveiled B.O.W İSTKA on August 9th.

(image source)
(image source)

The team published a really nicely produced video on their YouTube, featuring some test driving at a race circuit.

(Oh man, is than an old X61 at 0:54? Great laptop; I never should have let mine go)

72: Proton

Proton is no longer listed on the official WSC teams list. Although disappointing, I'm not super surprised. Better luck next time.

77: Blue Sky

Status: Unveiling scheduled. The team announced on Facebook that their new car will be unveiled on August 14th.

No news this week.

82: Kookmin University

Status: Unveiled, and Shipped! Kookmin unveiled Taegeuk on July 7th, and shipped their car to Australia at the end of July.

No news this week.

88: Kogakuin University

Status: Unveiled, and Shipped! Kogakuin unveiled Wing on June 29th, and shipped the car to Adelaide on July 31st.

No news this week.

Cruiser Class

5: SunSPEC

Status: Unveiled! Singapore Polytechnic unveiled SunSPEC 5 on July 21st.

The team took SunSPEC 5 for it's very first test drive over the weekend.

9: PrISUm

Status: Unveiled! Iowa State unveiled Penumbra on June 2nd.

No news this week.

Status: Unveiled! Bochum unveiled Blue.Cruiser on July 5th.

Not much news. The team posted a few interior detail photos.

14: Flinders

23: University of Tehran

The team has continued their multi-week streak of frequent Instagram updates after months of silence. I really like this mashup of a drawing of the finished car overlaid on top of their real work-in-progress car - it's a neat concept for a photo that I'm not sure if I've seen before.

30: Team Arrow

No news this week.

33: Cairo University

No news this week.

35: IVE Sophie

Status: Unveiled! IVE unveiled Sophie VI on July 1st.

The team has posted two videos (1, 2) of test driving the car. You can really get a sense of how long and low it is.

40: Eindhoven

Status: Unveiled! Eindhoven unveiled Stella Vie on June 21st.

According to their latest newsletter, the team is doing final testing and preparing to ship.

42: TAFE SA

No news this week.

45: Lodz

Status: Unveiled, and Shipped! Lodz unveiled Eagle Two on July 14th, and shipped to Australia on July 17th.

No news this week.

STC2 took Nikola for its first test drive this week!

(image source)
(image source)

I'm going to be honest: When I saw this post six weeks ago, I was pretty sure we wouldn't be seeing this team in Australia - but I've been incredibly impressed with how quickly this team has finished the car since then. It's not going to be competitive (lol aero), but does that matter? You don't build a car like this because you want to win; you build a car like this because you want to drive a life-sized hotwheels car. Awesome.

Now it just needs a solar array...

75: UNSW Sunswift

We don't expect an unveiling until September.

No news this week.

94: University of Minnesota

Status: Unveiled, and Shipped! Minnesota unveiled Eos II on July 11th, and shipped it out to Australia over the last weekend in July.

No news this week.

Status: Unveiled! KUAS unveiled Apollo VIII on June 29th.

No news this week.

Adventure Class

52: Illini Solar Car

Status: Shipped! The team shipped Argo out to Australia at the start of August.

In their blog post about shipping the car, the team noted that they got some help from the University of Minnesota team - it's always good to hear about teams helping each other out.

A team member also made a comment on reddit about why they're racing in the adventure class - apparently the car was designed for ASC 2016, but wasn't completed in time for that race.

Finally, the team has dumped a bunch of photos to their Flickr from construction, testing, and shipping. Overall, it looks like a very well engineered and constructed car for a rookie team.

53: Mississippi Choctaw High School

No news this week.

Thursday, August 3, 2017

WSC 2017 Update: August 3rd

It's the first week since the teams list was released that we haven't had any dropouts! We're holding steady at 45 teams: 27 Challenger, 16 Cruiser, and 2 Adventure teams.

(Compare to a total of 43 teams that showed up in 2015: 29 Challenger, 11 Cruiser, and 3 Adventure teams)

Five upcoming unveiling events were announced this week: RVCE announced their unveiling for August 5th, NIT on the 6th, ITU on the 9th, Blue Sky on the 14th, and Adelaide University will unveil on August 29th. We already knew that NWU will unveil on the 22nd, JU on the 28th, and WSU on the 29th - so now we're up to eight unveiling events coming up in August. Mark your calendars!

Also several teams shipped this week: Principia, Kookmin, Kogakuin, Minnesota, and Illini have all shipped their cars out for Australia.

Challenger Class

Status: Unveiled! Michigan unveiled Novum on July 7th.

No news this week.

Status: Unveiled! Nuon unveiled Nuna 9 on July 25th.

No news this week.

4: Antakari

The team has been broadcasting live videos of assembling the car on their Facebook, which is pretty cool. The team assembled the upper and lower shells together for the first time earlier this week.

(image source)

7: Adelaide University

Status: Unveiling scheduled. The team has announced that Lumen II will be unveiled on August 29th.

8: Punch Powertrain

Status: Unveiled! Punch unveiled Punch Two on June 21st. It will ship for Australia around August 20th.

An astute anonymous reader pointed out some array trickery in the comments last week - although in appeared that Punch was doing a silicon array, that is not the case!

A full 4sqm Sunpower E60 array is 260 uncut cells. Looking at photos of Punch Two and counting solar cells, we can see that the array is 22 cells long and 10 cells wide with roughly a 15 x 3 cell block removed for the canopy - only 175 cells, nowhere close to 260! 4sqm * (175/260) = 2.69sqm of array area, which is almost exactly the amount allowed for multi-junction arrays.

Another big indicator that Punch is definitely not doing a silicon array is the way the array is trimmed next to the driver canopy:

(image source)

Those cells next to the driver aren't trimmed in any rational way. Cells are usually all trimmed in the same way such that the power output of all the trimmed cells match - see Twente's 2015 car for an example. I think it's clear that the recess in the top of the car is designed for different sizes of solar cells than are currently visible on the car, and that the array visible at the moment is a fake.

(Aside: It's possible that we're seeing some old/spare array modules that the team massacred for camouflage purposes... but if I had to guess, it's probably images of solar cells printed on paper and then encapsulated like a normal solar cell. I've seen this done before and it's nearly indistinguishable from a real array module unless you're up close and in bright sun.)

I didn't notice initially because it's so hard to pick out the scale of the cars this year... It looks so much like a 2015 car that I didn't realize how small it really is! You can get a little bit of a sense in this video around 0:16, but the team was pretty careful to not place the cars too close to each other.

The team didn't deny it when I asked about the array. So, that's right: three out of the top five teams from 2015 are doing tiny multi-junction arrays this year, and the last one (Tokai) is still an unknown!

10: Tokai

Still no news from Tokai. As I pointed out two weeks ago, their WSC team profile notes Panasonic solar cells - which presumably means the HIT silicon cells they've used for the last few races. This doesn't rule out a Kogakuin-style bullet car, however...

No news this week - and other than one teensy tweet showing some composites practice from early May, I haven't seen any signs of progress on the car.

15: WSU

Status: Unveiling scheduled. WSU announced an official unveiling date: August 29th.

WSU received some motor parts this week and is evidently still doing some composites work. It must be some smaller parts, because I think the team has already painted the main body of the car. My bet is wheel fairings, I always remember working on those up until the very last minute. To quote an even older solar car alumni than me: "Wheel fairings are like little baby solar cars strapped up underneath your solar car; they'll take as much time and effort to design and build as the entire rest of the car."

16: Stanford

Status: Unveiled! Stanford unveiled Sundae on July 1st.

Not much news this week, just a little more battery manufacturing.

18: UiTM EcoPhoton

No news this week.

20: Durham

Status: Shipped! Durham shipped their car to Australia on July 18th.

No news this week.

21: Twente

Status: Unveiled! Twente unveiled Red Shift on June 23rd.

Not much news from the team this week, just some more car testing.

The realization that Punch pulled a fast one on us with the array made me go back and double check - and I'm sure that Twente is definitely doing a 4sqm silicon car; no shenanigans here. Some infographics directly call out a 4sqm array, and we can verify it other ways:

For example, Red Shift is 4.27m long x 1.38m wide = 5.89sqm planform area. Subtract out the 4sqm array, and we're left with 1.89sqm of space left over for the driver canopy. This lines up closely with how much space the driver canopy took up on 2015's Red One: (4.5m *1.8m) - 6sqm = 2.1sqm.

We can also look at photos the team has posted - this photo sure looks to me like the array blank is cut for integer numbers of silicon cells (look at the back of the driver cockpit), and we can compare this photo of the bare upper to this photo of the car in the wind tunnel to verify that there's no funny business with the blacked-out part of the car not matching the actual shape of the indentation molded into the top for the array.

22: MDH

Status: Unveiled! The team unveiled way back on May 31st.

The team has received their battery cells.

25: Nagoya Institute of Technology

Status: unofficially Unveiled! No formal unveiling event yet, but the car was shown testing at Bridgestone's test track on July 15th. I think the formal unveiling is scheduled for August 6th.

The team has attached their solar array, and will be racing at Suzuka this weekend.

28: Neul-Hae-Rang

Status: Unveiled! The team unveiled Woong-bi on June 25th.

The team posted a few photos from their unveiling to Facebook, so we have a little more than that vertical video to look at now. Yep, looks just like the rendering that's on top of their WSC team profile.

29: Siam Tech (Edison)

Looks like the team is starting to work on their array.

32: Principia

Status: Unveiled, and Shipped! There wasn't a formal unveiling event, but Principia took Ra X to Formula Sun in Texas, July 3-8. The team shipped the car to Australia on August 1st.

34: RVCE

Status: Unveiling scheduled. Public unveiling of Arka is scheduled for August 5th.

37: Goko High School

No social media links, so no updates. The car appears to be finished.

38: North-West University

Status: Unveiling scheduled. Public unveiling of Naledi is scheduled for August 22nd.

No news this week.

43: Australia National University

No news this week.

46: Jonkoping University

Status: Unveiling scheduled. The team has announced on Facebook and Instagram that Solveig will be unveiled on August 28th.

EDIT August 29th: The chassis below was a test chassis, and pretty much all of my concerns were addressed in the chassis on the finished car

I ran across a video from the first half of May in which the team was presented with an award, and there's a pretty detailed video of their chassis. And... wow. This is going to be a ludicrously thin car, at least as far as the array airfoil is concerned. I guess that's not exactly a secret; they've been posting renders and photos on their Instagram since way back in mid March... but somehow I never realized exactly what they were building until I saw the video.

(Screenshot around 0:48)

That said, I'm left scratching my head about some details, and really worried about others. For example, I'm not sure what's going on with the steering linkage pictured above - but it gives me the heebies. Also, the weld quality leaves something to be desired:

(Screenshot around 1:08)
A big void in the weld, right on the top of the roll cage
(Screenshot around 1:37)
Not the greatest welds...

Also, why is the tube on the upper right of the driver compartment made out of three tubes sectioned together at different angles? It would be a lot stronger and lighter if it were a single tube straight down to the front suspension mount. And what on earth is going on with the front left suspension mount? Braking forces are going to load up the welds on either side of that front tube in bending, and that's a big moment arm:

wat

Whoever designed this chassis seems to have been allergic to trusses, or bracing in general. Consider the steering column mount: why is is only attached to one side of the driver compartment?? A few extra ounces of material to complete the span would enhance the rigidity of the chassis and make the driver compartment much more resistant to collapsing under side impacts. You could probably save weight overall by being able to reduce the wall thickness on that super-long unsupported tube on the upper right of the driver compartment.

(Screenshot around 1:15)
Why?!?

Long unbraced tubes will work if the wall thicknesses are high enough, but that's a real brute-force way of doing it - this chassis would be lighter and stronger if it was designed with truss-like structures throughout. Perhaps the special Docol steel that they were sponsored with wasn't available to the team as thin-wall tubing...?

(I'm actually a little curious about the properties of that tubing, as there doesn't appear to be a single bent tube in the entire structure - it's all sectioned, mitered, and re-welded. Formed tubing in the roll cage would have allowed it to conform much tighter to the driver's head, and resulted in a smaller canopy)

Anyway, there's a lot of strange stuff going on with this car. The team seems to have done a lot of test driving on the chassis, so hopefully it hold together all the way to Darwin... ¯\_(ツ)_/¯

70: Sonnenwagen Aachen

Status: Unveiled! The team unveiled Huawei Sonnenwagen on July 20th.

Not much news this week. If I'm translating this blog correctly, the team is going to hold a sendoff event for the car on August 18th.

71: Istanbul Technical University

Status: Unveiling scheduled. The team just announced on Facebook that their new car will be unveiled on August 9th.

72: Proton

The team posted some screenshots of extremely basic CAD of their suspension to Facebook.

I'm going to be really honest, I do not expect this team to show up in Darwin with a car capable of crossing the start line.

77: Blue Sky

Status: Unveiling scheduled. The team just announced on Facebook that their new car will be unveiled on August 14th.

82: Kookmin University

Status: Unveiled, and Shipped! Kookmin unveiled Taegeuk on July 7th, and just posted to Facebook that they have shipped their car to Australia.

88: Kogakuin University

Status: Unveiled, and Shipped! Kogakuin unveiled Wing on June 29th, and shipped the car on July 31st. The team is shipping to Adelaide, and they will be testing out the car on a mock race while heading north to Darwin.

One interesting photo surfaced in yet another news article about the testing Kogakuin and NIT did at Bridgestone:

(image source)

You can see how much larger the rear wheel well is than the front - this is to accommodate the swiveling of the rear tube axle.

Cruiser Class

5: SunSPEC

Status: Unveiled! Singapore Polytechnic unveiled SunSPEC 5 on July 21st.

Not much to report this week - a few new photos posted to Facebook.

9: PrISUm

Status: Unveiled! Iowa State unveiled Penumbra on June 2nd.

The team took the car to a wind tunnel recently. I'm really amused that they kept the headlights on in the tunnel...

Status: Unveiled! Bochum unveiled Blue.Cruiser on July 5th.

One of our comments last week pointed out that the car looks a lot like a Citroen DS, and I'm forced to agree:


The team is doing a lot of testing right now. We've also been provided a view of what the passenger compartment looks like when fully loaded.

14: Flinders

No news this week.

23: University of Tehran

The team was very active on their Instagram this week, including lots of photos of composite work. It looks like the body of the car might be mostly complete.

EDIT: Just after posting this, the team posted some more photos to Instagram. You can see here and here two very good images of the current state of the car. Still quite a ways to go...

30: Team Arrow

No news this week.

33: Cairo University

No news this week.

35: IVE Sophie

Status: Unveiled! IVE unveiled Sophie VI on July 1st.

No news this week.

40: Eindhoven

Status: Unveiled! Eindhoven unveiled Stella Vie on June 21st.

No news this week.

42: TAFE SA

No news this week.

45: Lodz

Status: Unveiled, and Shipped! Lodz unveiled Eagle Two on July 14th, and shipped to Australia on July 17th.

No news this week.

The team took their chassis for a short test drive a few days ago.

75: UNSW Sunswift

We don't expect an unveiling until September.

The team is currently hard at work manufacturing interior panels.

94: University of Minnesota

Status: Unveiled, and Shipped! Minnesota unveiled Eos II on July 11th, and shipped it out to Australia over the last weekend in July.

Status: Unveiled! KUAS unveiled Apollo VIII on June 29th.

KUAS has been posting a lot of workshop photos and videos to Facebook. In particular, they're hard at work manufacturing interior components (just like Sunswift), and have received their MPPTs.

Adventure Class

52: Illini Solar Car

Status: Shipped! Illini's car is looking pretty finished, and the team has packed up everything and shipped their stuff out for Australia.

53: Mississippi Choctaw High School

No news this week.

Thursday, July 27, 2017

WSC 2017 Update: July 27th

The official list is down to 45 teams: St. Petersburg Polytechnic University disappeared off the list this week.

Challenger Class

Status: Unveiled! Michigan unveiled Novum on July 7th.

Michigan is presumably out doing their mock race right now (blue tape! Blasphemy!). I saw some photos from them on Flickr earlier this week, but they've since been taken down. I dug through my browser's cache to find them, and I'm not sure what the big deal was? Your front wheel fairings aren't *that* much of a secret, folks.

Status: Unveiled! This is the big news for the week, the 6-time winners and returning champions unveiled Nuna 9 on July 25th.

Nuna 9
(image source)

At first glance, it doesn't look all that different from what we've seen from other teams: a fairly straight-forward evolution of the asymmetric catamaran design to the smaller planform. It shares a lot of design features in common with Punch's new car, and even goes a step further - in addition to eliminating the front overhang, Nuon has eliminated the rear overhangs as well. The horizontal trailing edge of the array blends cleanly and smoothly straight into the vertical trailing edges of the wheel fairings. Quality of the car, as expected, appears extremely high. The body seams are exemplary - I have to look reeeally hard to see the seams around the array, canopy, and wheels.

But wait... I know the Dutch are tall, but those students look like giants next to the car. And what are those solar cells...?

Yep: those are multi-junction solar cells, and that is a 2.64sqm array - just like Michigan, but on a different form factor of car. This is a tiny catamaran! This article has a video with some shots from unveiling, including Nuna 9 next to Nuna 8, starting at 0:43:

Nuna 8 and Nuna 9
(image source at 0:43)

Daaaaang that is small! Nuna 8 is 4.5m long x 1.8m wide; It's hard to judge precisely from this screenshot but I would say that Nuna 9 is absolutely no larger than 3.5m long x 1.6m wide.

Nuna 9 and Michigan's Novum are going to look so silly next to each other - completely different proportions.

Some Dutch news websites have published videos of the car driving already, and some other details can be teased out. In this video, you can see the swingarm rear suspension and double-A-arm up front - the same layout as Nuna 8. At 0:37, you can also see how they will have the driver normalize the array: the array is on a 4-bar linkage, and there is a telescoping carbon tube located next to the driver.

The team posted a video of some CAD flyaround - you can see how nicely the array in blended into the all sides of the wheel fairings, and how narrow the non-drive-side fairing is. You can see in this photo how smooth that rear blend is on the real car, as well as a full 3D printed trailing edge/taillight diffuser - just like on Nuna 8 two years ago.

I did some napkin math a little while ago with some other alumni, and we concluded that a multi-junction array was the clear way to go. With the new sizing rules, the array power is comparable to a silicon array when you look at raw efficiency numbers. But a multi-junction array may actually be significantly more powerful than silicon when you factor in the better performance in heat - especially with the new "no coolant spraying" rule! And a smaller car is lighter and more aerodynamic. More power, less weight, less drag - win win win, with cost/availability being the only downside. Honestly, I'm a little surprised we've only seen two teams switch to multi-junction arrays...

Nuna 9 is an incredibly hot little car, and I can't wait to see how it performs. Good luck to Nuon!

4: Antakari

More car construction videos and photos continue to be posted on their Facebook and Instagram - it looks like they've just bonded the composite chassis into the lower shell. Also note that they have received their solar array from Gochermann.

6: MIT

Status: Not Attending.

MIT confirmed that their removal from WSC teams list last week was not a mistake; they're out of the race. That said, I'm a little confused - the team has broken radio silence on social media after their withdrawal announcement, posting photos of the car at a wind tunnel in late February and the chassis driving around in early June. It seems like the team was well on schedule, which doesn't jibe with the statement "...we decided that there was simply not enough time to properly test and prepare ourselves for the race..."

Huh.

7: Adelaide University

No updates of note in the past week.

8: Punch Powertrain

Status: Unveiled! Punch unveiled Punch Two on June 21st. It will ship for Australia around August 20th.

Not much to note this week. Is this your cat?

10: Tokai

Still no word on Tokai's car, or when it will be unveiled. This is the only big Challenger team that is yet to release any details on their car - all of the other Challenger teams that have yet to unveil have at least released a rendering or profile shot of the car (other than the rookie Proton team).

No updates this week.

13: Polytech Solar

This new team from Russia is no longer listed on the official WSC teams list :(

No updates from the team's social media about this.  EDIT 7/30: This VK Post cites financial difficulties, and announces that they will attempt to enter the 2018 American Solar Challenge instead.

15: WSU

Status: Unveiling scheduled. WSU announced an official unveiling date: August 29th.

This week, the team is prepping the car for paint.

16: Stanford

Status: Unveiled! Stanford unveiled Sundae on July 1st.

The team recently posted a great video showing a ton of details on the construction of the car. It's eleven and a half minutes long, but it's worth watching the entire thing.

They've also posted a few photos to Instagram showing battery construction progress.

18: UiTM EcoPhoton

Today the team posted a picture of... cosmetically copying a portion of Nuon's old front suspension? Uhhh... huh.

20: Durham

Status: Shipped! Durham shipped their car to Australia on July 18th.

No updates since then.

21: Twente

Status: Unveiled! Twente unveiled Red Shift on June 23rd.

Twente has been busy testing and characterizing the performance of their new car. They also posted the first video of it driving.

22: MDH

Status: Unveiled! The team unveiled way back on May 31st.

No noteworthy updates in the past week.

25: Nagoya Institute of Technology

Status: Unveiled! No formal unveiling event, but the car was shown testing at Bridgestone's test track on July 15th.

No news directly from the team this week, but Bridgestone posted a little about the testing NIT and Kogakuin did.

28: Neul-Hae-Rang

Status: Unveiled! The team unveiled Woong-bi on June 25th.

The team posted a sideways video of their unveiling to Facebook. Form what little I can see, it looks pretty much exactly like the rendering on their WSC team profile.

29: Siam Tech (Edison)

The team posted some more construction photos to Facebook.

32: Principia

Status: Unveiled! There wasn't a formal unveiling event, but the team took Ra X to Formula Sun in Texas, July 3-8.

No updates from the team this week.

34: RVCE

No updates from the team this week.

37: Goko High School

No social media links, so no updates. The car appears to be finished.

38: North-West University

Status: Unveiling scheduled. Public unveiling of Naledi is scheduled for August 22nd.

Interestingly, the team has designed a 3D printed structure for holding their battery cells within the pack, and is attempting to crowdsource the printing of the parts. They've also open-sourced the parts on Thingiverse.

43: Australia National University

No updates from the team this week.

46: Jonkoping University

Status: Unveiling scheduled. The team has announced on Facebook and Instagram that Solveig will be unveiled on August 28th.

Not much news this week - they've been posted a lot of sponsor appreciation posts on their blog. The post about their chassis is a little interesting, however - the new car uses a steel tube frame, whereas their previous car was a composite chassis. The post touches on a lot of points that I often try to make with new teams. The big one: Carbon fiber does not automatically make your car lighter. They also make an interesting point about how decoupling the chassis and aeroshell allows for earlier testing of the electrical system on a driving chassis. My old team used to strap the new electronics to an old car for early testing, but that isn't something that a new team can do.

70: Sonnenwagen Aachen

Status: Unveiled! The team unveiled Huawei Sonnenwagen on July 20th.

This news story has a pretty good video, including several good shots of the inside and outside of the car.

71: Istanbul Technical University

The team posted a very brief video of what appears to be the chassis driving around a parking lot at night.

72: Proton

The team posted a link to a news story on their Facebook. Translating, it sounds like the design is mostly finished, but the team has not yet begun manufacturing and is still looking for sponsors.

The team's profile on the WSC site is still completely blank. This is the only Challenger team (other than Tokai) that has not yet even posted the smallest image of what their car will look like.

77: Blue Sky

No updates this week. The last updates from the team were of body construction in over late May.

82: Kookmin University

Status: Unveiled! Kookmin unveiled Taegeuk on July 7th.

No updates since then.

88: Kogakuin University

Status: Unveiled! Kogakuin unveiled Wing on June 29th.

Kogakuin was featured in the Bridgestone post alongside NIT.

I think I figured out one of reasons for the weird high-trail front steering - if you look at this photo, you can see that due to how far forward the wheels are within the nose of the car, there's much more space at the rear part of the wheel well than the forward part. By shifting the steering axis forward relative to the centerline of the wheel, the wheels fit into the nose better and they are able to keep the wheelbase longer and the track width wider.

The team also posted a photo of their rear suspension:

(image source)

This was completely unexpected to me: A rigid tube axle on a multilink setup with a single shock. Wild. I was wondering what those big gold cones in their teardown photo were all about...

Cruiser Class

5: SunSPEC

Status: Unveiled! Singapore Polytechnic unveiled SunSPEC 5 on July 21st.

No news from the team since then.

9: PrISUm

Status: Unveiled! Iowa State unveiled Penumbra on June 2nd.

No major news in the past week. The team recently took off to Michigan, continuing on their sponsor tour.

Status: Shipped! Unveiled! The team unveiled Blue.Cruiser on July 5th.

I thought they shipped the car out, but I guess it was just supplies - and a large lithium battery pack, as you can see by the warning label on the big metal box:

Big ol' Cruiser battery pack.
(image source)

The team has been out testing their car, and posted some more photos. I really love the front end of this car - it looks really aggressive, especially from the side. Some interesting stuff to note in the photo below:

(image source)

First, what's up with those little circles underneath the back corner of the light, and up at the front? They really looks like the ultrasonic parking sensors that you see on the rear bumpers of production cars.

Second, while those wheels look cool and all, I really hope they put some disc hubcaps over them for the race, like they did with SunRiser.

Third, is that a small tunnel I spy under the car? I'd love to get a front-on shot of the car. This car keeps reminding me of Minnesota's 2013 car...

Finally, one last photo, newly posted to their WSC team profile:

(image source)

A great side profile shot which really shows how long the cockpit is. It definitely makes sense as a 4-seater from this perspective, although I don't know why they couldn't give the back seat passengers some longer windows...

14: Flinders

No updates this week.

23: University of Tehran

The team posted a whole bunch of industrial design sketches to Instagram this week.

More importantly, they also posted a video with a few very short shots with parts of a new car in the background and a picture of some team members working on electronics.

30: Team Arrow

No updates this week.

33: Cairo University

No updates this week.

35: IVE Sophie

Status: Unveiled! IVE unveiled Sophie VI on July 1st.

No updates this week.

40: Eindhoven

Status: Unveiled! Eindhoven unveiled Stella Vie on June 21st.

No updates this week.

42: TAFE SA

No updates this week.

45: Lodz

Status: Unveiled, and Shipped! Lodz unveiled Eagle Two on July 14th, and shipped to Australia on July 17th.

No updates this week.

The team keeps posting construction photos and videos to Facebook and Twitter. Notably, the suspension is installed on the chassis and the motors spin!

75: UNSW Sunswift

The team posted a small batch of construction progress photos to Facebook at the start of the week. We don't expect an unveiling until September.

94: University of Minnesota

Status: Unveiled! Minnesota unveiled Eos II on July 11th.

No news in the past week.

Status: Unveiled! KUAS unveiled Apollo VIII on June 29th.

The team posted a link to a news video about the team. There is a lot of footage of older cars, but some shots of their new Cruiser car. Particularly interesting, at 8:04, you can see that the car currently has a single motor - a Mitsuba at the left rear.

Also, that's a lot of batteries. I count 40 boxes, each with 30 cells in them. Assuming the loose cells came out of the close boxes at the upper right, that's 1200 cells. That many Panasonic 18650 cells is roughly 58kg of batteries! And who knows how many more boxes are out of frame?

Adventure Class

52: Illini Solar Car

The team posted a brake test video, a new photo of their chassis (looks clean!), and a photo of the topshell going on the car.

53: Mississippi Choctaw High School

Thanks to ScientificGems for pointing out their website: https://www.tushkahashi.com/

No news this week.