Casper Wu // // No Comments

The CalSol Operations team conducted multiple interviews with organization leaders in an effort to show prospective members and sponsors who we are, what we do, and why we do what we do. Today, we would like to introduce you to our Mechanical Coordinator and Subteam Lead: Jorell Gotamco.

As a 3rd year studying mechanical engineering and material science, Jorell joined CalSol to gain more hands-on experience with major-related activities. That led him to the Mechanical Subteam.

“I just wanted to learn more and it had mechanical in the name, so I joined. Since then, the club has been one of the most interesting and relevant activities I’m interested in,” Jorell said.

Eventually working his way up to Mechanical Subteam Lead, Jorell is now in charge of the largest subteam in CalSol. The Mechanical team is broken up into the different systems of the solar car: shell, structure, suspension, brakes, steering, hubs, and batteries. Members learn, design, and cooperate in these teams, each of which is led by a project lead that reports directly to Jorell in weekly meetings.

After these meetings, the system teams split up in order to discuss more team-specific line items and do there best to address them. Frequently, these line-items are related to design reviews.

Said Jorell, “In terms of design reviews, we have multiple rounds starting from the preliminary one. The team comes together and presents their plans, we ask questions, and then the team readjusts. This process keeps repeating itself throughout the design process and eventually ensures that we build the best car possible.”

However, these design reviews serve a secondary purpose as well.

“A challenge we have had is knowledge transfer. When a member graduates and a new person takes up the task, there is always some stutter in the transition. It’s important we document these things on our design review presentations so that future members can understand what we were doing and make more progress,” Jorell said.

Other challenges Jorell listed included increasing the environmental sustainability initiatives within CalSol and organizing the facility where the club keeps and works on their cars. While CalSol still has much room for improvement as indicated by these challenges, Jorell credits the club for some of his own personal development.

“If I had not joined, there is a lot of content that I just would have never learned in class. I never covered how to design certain things and conduct analyses in class the way we do in CalSol, which is practical and valuable. There’s so much more that goes on in processes like manufacturing parts that I just haven’t learned in class yet.”

Also teaching Jorell team management skills and other soft skills, CalSol has helped the mechanical lead acquire unique practical skills that he says he would not have otherwise had. As an added bonus, some of Jorell’s favorite memories can be attributed to CalSol.

“When we were in Texas last year for the FSGP race, it was cool to see Tachyon do well on the track. There was this one relatively steep hill that solar cars would get stuck on and we were all waiting with baited breaths given that this was one of the first times driving Tachyon. Luckily, when Tachyon got to the hill, it went up and up and up and we were all like ‘Yes!!’” 

In conclusion, Jorell believes that CalSol is an incredible learning opportunity that allows you to create, collaborate, and compete among a diverse community of engineers. He plans to continue on with the club as an engineering director next semester.

Sponsorship Thank You: Texas Almet

Helen Wang // // No Comments

CalSol would like to give Texas Almet a huge shoutout for their donations that helped make our Tachyon the solar car it is today!

Aluminum Honeycomb

Texas Almet is one of North America’s leading producers in honeycomb components which are known for impressive strength without added weight overhead.  In fact, the durable yet light honeycomb cells the company provided us with have been instrumental in improving Tachyon’s efficiency.

Once again, we would like to thank Texas Almet for the support!

Sponsorship Thank You: Recurrent Energy

Helen Wang // // No Comments

Huge thank you to Recurrent Energy, a subsidiary of Canadian Solar, for the continuous support since 2013!

Recurrent Energy is a leading utility-scale solar project developer, delivering competitive, clean electricity to large energy buyers. Recurrent Energy has approximately 7 GW of solar and storage projects in development in the U.S., and the company is currently working on projects all over California and beyond! 

Project Portfolio - Recurrent Energy

Recurrent Energy has sponsored over $8,000 thus far to CalSol. We greatly appreciate your help!

CalSol’s 2019 Australian Adventure

Alexander Zerkle // // No Comments

The dust has settled on our trip to Australia, everyone’s back home, and it’s time to take a look at how things went! This was CalSol’s first appearance at the World Solar Challenge since 2011, and Tachyon’s first-ever road race, so there were lots of chances for exciting new things to happen.


    While we made a lot of progress on Tachyon in Texas (and after getting home), we only had about a month between the Formula Sun Grand Prix (FSGP) and our ship-out date for the Bridgestone World Solar Challenge (BWSC), and we had to use a lot of that time switching Tachyon to comply with Australian regulations. Tachyon was still ultimately a new car. Its recent completion also meant it didn’t have license plates yet, so we couldn’t road test! Although we knew we had built a fundamentally sound vehicle, there will always be inherent uncertainty in competing in a road race with a vehicle only tested on the track.

Trailer Trip

    Due to Darwin’s relatively small size, we found it was only feasible to ship our car to the south coast of Australia. This meant we needed to rent a trailer and a pickup truck , and trailer Tachyon across the race route in reverse to get to Darwin. (We ended up renting a “ute,” which I consider to just be an Aussie term for a pickup truck. I’ve been assured that there are differences, but I assume I’m just too American to understand.) We sent an “early crew” consisting of myself, Annie Wang, Avinash Jois, Eric Lu, and Lekha Duvvoori (Team Manager, Solar Driver/Operations, Electrical, Chef, Solar Driver/Mechanical, respectively) to Melbourne ahead of the race to get our shipping container cleared through Australian customs and then drive to Darwin. In addition, we were fortunate to be joined by Des Riessen, an Adelaide resident, firefighter, truck enthusiast, and all-around incredible person.

    Due to our timeline, budget, and the large size of our car, the most reasonable choice of trailer seemed to be a flatbed. Many teams favor these; you simply roll the solar car on, ratchet-strap it down, and secure a tarp over it, and then you can drive off! Although an enclosed trailer does provide more protection, the walls would also restrict the car significantly, and we would likely have difficulty getting Tachyon in and out. Enclosed trailers of the width we would need are also much harder to find.

    Unfortunately, the decision to use an open, flatbed trailer also comes with risks. We experienced this firsthand when our windshield, which was at the time constructed of two separate sheets of polycarbonate, failed near the beginning of our trailer trip. We’re not sure exactly what caused the break, but part of the smaller section of the windshield broke completely off. At highway speeds on the back of the trailer, a large amount of air was able to flow into Tachyon through the hole in the windshield, which was not a parameter we designed for. This airflow caused serious problems when it blew the roof off while we were driving! Tachyon’s solar array and the composite roof it was attached to were forced off of the main body of the car and landed by the side of the road. Thankfully, no one was hurt.

    Although the roof landed composite-side down, the fragile solar cells still took significant damage. In a more pressing concern, the structural part of the roof also split down the middle

The two pieces were held together by the encapsulate surrounding the silicon solar cells—not very structural! It was quite shocking seeing our car in such a state.

After this significant setback, we were very careful on the rest of the trailer trip. We got some canvas and a lot of foam to protect our remaining cells, and then used ratchet straps around the entire car to keep anything from moving. We also perfected our tarping technique so the tarps would not tear in the wind.


    Once we made it to Darwin, we were able to reunite Tachyon and the early crew with the other 11 members of CalSol’s race crew, which drastically increased our work capacity. We immediately got to work fixing the roof, replacing damaged cells, and replacing the windshield, as well as making a handful of other fixes that we knew about before ship-out. We even tried to install a second battery pack to triple our range (Thank you so much to Octillion Power Systems for providing us with the modules!), although we unfortunately did not have enough time to make that particular project ready for this race.

    The actual scrutineering process went very smoothly. We passed most stations quite easily, and most of the requested changes were relatively easy fixes. Even the notorious mechanical inspectors required no changes to be happy with Tachyon!

    Dynamic scrutineering was similarly smooth sailing; our brake test in particular drew congratulations from the officials standing near me at the time. Tachyon successfully braked in less than half of the available space.

On the Road

    For whatever reason, the BWSC event officials no longer keep granular track of how far the solar cars drive. The only measure of distance is how many stages are completed. However, by our own reckoning, we think Tachyon drove about 700 km on its own power, including more than 400 km uninterrupted in a single day. While there is certainly room for improvement, we consider this a definite success. The start of the racing period was dogged by overheating concerns and motor damage from a rock getting where it shouldn’t have, but we successfully overcame those problems to finish strong. 


The public showcase period after crossing the finish line afforded us a valuable chance to talk with other teams after most of the stress was over. All of the world’s best solar car teams compete at BWSC, so this gave us ample opportunity to learn from our role models.

Lessons Learned

    We learned a lot from our Australian adventure. As our first race in eight years not affiliated with the American Solar Challenge, it taught us how to navigate an unfamiliar competition structure and regulation environment. We also relearned how risky it can be to race with a brand-new car. In the future, we plan to leave more time between finishing a car and racing it, so we can have a proper chance to test it out and iron out the kinks. We have also resolved to rent an enclosed trailer whenever we can’t use our own, no matter what.

    Most importantly, we talked a lot with our friends, old and new, on other teams. Many teams we saw had never gone to the American Solar Challenge, and others only rarely. This outside perspective really helped us challenge our preconceived notions about how to run the best team we can, and we’ll be putting some of what we saw into practice.


    I would like to thank everyone who contributed to CalSol’s effort at this year’s BWSC. Foremost in my mind are the 16 people who joined me on the journey. Many took the entire semester off of school to be able to attend. Des Riessen, mentioned earlier, joined us when we needed another authorized driver for our ute on the trailer trip to Darwin, but ended up contributing in countless ways throughout our entire journey. 

    I’d be remiss if I didn’t acknowledge the incredible assistance offered by other solar teams; everything from pasta given by Onda Solare (University of Bologna), to a critically important vacuum pump we borrowed from Western Sydney University when we needed to wet layup (i.e. glue) our roof back together. This trip underlined for us the generosity and camaraderie in the solar car community, and I know that it at least inspired me to be more generous myself.

    Speaking of generosity, I would also to thank our generous sponsors, without whom none of this would be possible. Included in this are last year’s crowdfunding donors, who specifically contributed to our WSC effort. 

All things considered, this year’s BWSC was a very rewarding experience, and I’m honored to have had the chance to lead CalSol’s effort. I’m sure that when we go back, we’ll be able to do even better.

Alexander Zerkle

BWSC Team Manager for CalSol

CalSol wins Second at the 2019 Formula Sun Grand Prix!

Helen Wang // // No Comments

CalSol competed at the 2019 Formula Sun Grand Prix from July 4rd to July 7th in Austin, Texas. We raced our first-ever cruiser, Tachyon, and won second place in the cruiser class!

We would like to thank all our sponsors for supporting us throughout the process, and we would also like to thank the Innovators Educational Foundation for organizing FSGP 2019!

MOV Podium! Congrats to Calgary and Waterloo for their amazing cars as well!

We also won the sportsmanship award!

Huge shoutout to the team for working 24-hour shifts and getting the car race-ready!

FSGP Day 6 Recap: Farewell!

Helen Wang // // No Comments

We did it! After a week of intense, around-the-clock work, constant discussions, and sleepless nights, we have finally finished racing Tachyon at FSGP 2019. We received SECOND PLACE in the MOV category, which is much better than we expected! In addition, we received the sportsmanship award during the awards ceremony! CalSol has worked so hard to get here, and we are so grateful for everyone who helped along the way.

Team photo!

You know we had to do a silly photo!

We 💖 our seniors 💖💖💖

Huge shoutout to our drivers for withstanding the sweltering heat (and constant hydration!)

Our composites team, who had to deal with carbon fiber all. the. time.

Shoutout to our electrical team for their constant work on the car and helping it run smoothly.

Mechanical subteam really steering us to success!

Our Solar subteam: small but powerful, just like our cells!

Operations subteam with that “amazing” improvised vinyl work.

Our wonderful exec board, constantly leading and motivating the team!

Special thank you to Tristan, our advisor and encyclopedia, for his endless amount of time and effort spent on CalSol!

Safety officers reminding you to HYDRATE

FSGP Day 5 Recap: Off to the Rayces!

Helen Wang // // No Comments

Today, Tachyon has completed 25 laps around the track, currently in second place in the cruiser class! Click here to access live updates on FSGP team ranks, and we are also streaming the race on Twitch. Tomorrow’s our last day of racing, so we are going to be putting in our all!

Tachyon on the track!
It’s a beautiful day to be raycing!

Richard “Ducky” Lin gets some help working on firmware.

So … who’s at the pits?

At Amy’s Ice Cream with Alumni!

FSGP Day 4 Recap: Tachyon on the Trackyon

Helen Wang // // No Comments

Today, we finished up dynamic scrutineering and got our first taste of the COTA track! Tachyon completed 3 laps in the last 15 minutes of racetime, moving up to a second place cruiser spot.

Before we get to the photos, here are some important links to keep you updated during the race. Click here to access live updates on FSGP team ranks, and we are also streaming the race on Twitch.

Slalom Test.

“11 … point … 5 …”

Brake Test.


Happy 4th of July!

Off to the races.

Tachyon going up The Hill — and passing it with flying colors!

FSGP Day 3 Recap: Fun in the Sun

Helen Wang // // No Comments

Today, we finished all of our static scrutineering, getting approval on body and sizing, mechanical, lights and vision, battery protection, and driver operations. In addition, our various subteams worked on finishing up various parts of the car, and CalSol continued onto dynamic scrutineering.

Click here to access live updates on FSGP team scrutineering status.

A beautiful day despite thunderstorms!

Battery Box.

It’s a bird, it’s a plane — it’s Eatone Cheng with a sail!

Weighing Tachyon.

Boosted Board vs. Dolly

Driver team huddle.

Heading to the first round of dynamics!

U-Turn Test.

We will be livestreaming tomorrow’s events on Twitch! Tune in and follow @BerkeleyCalSol on Instagram, Twitch, and Facebook for more.

FSGP Day 2 Recap: We Have Liftoff!

Helen Wang // // No Comments

For the first time, Tachyon has driven under its own power! Our team has completed scrutineering for drivers, safety, and array, and we are working towards finishing our electrical and mechanical scrutineering tomorrow. We gave our drivers a feel for the car during a nighttime road test around the parking lot.

Click here to access live updates on FSGP team scrutineering status.

Annie Wang driving Tachyon for the first time!

Driving to electrical scrutineering.

Electrical subteam discusses with the electrical scrutineer.

Battery Ventilation is whale built! 🐳🐳🐳

Nighttime Road Test.