NJIT – s Lead Tank Motors to a Medal at the Chem-E-Car Championship, NJIT News
NJIT’s Lead Tank Motors to a Medal at the Chem-E-Car Championship
The “Lead Tank,” a 25-pound driverless car with an intimidating name and an intricate timing mechanism, made NJIT history by medaling for the very first time in the championship round of the Chem-E-Car Competition, held earlier this week in San Francisco. In clinching third place, the shoe-box sized roadster edged out almost forty of the best teams from around the world.
As it stopped fourteen centimeters timid of perfection – the finish line – its creators gave way to whoops of delight. The team’s co-captain, Michelle Vazquez ’17, of Santa Fe Springs, Calif., noted that her cell phone recording of the Lead Tank’s run began gyrating insanely as the car trundled up to the finish line, a lump of gauze spread across a ballroom floor at the Hilton Hotel at Union Square.
“That’s because I was hopping and screaming and swinging my arms,” she laughed.
The competition, held by the American Institute of Chemical Engineers (AIChE), pitted NJIT’s team against top engineering schools, such as Cornell, the University of Michigan, Carnegie-Mellon University and Virginia Tech. Universities in Hong Kong, Poland, Columbia and Korea, among nine international entries this year, all sent their best.
The car that comes closest to the finish line before shutting itself off is proclaimed the winner. Each team gets two attempts.
The Lead Tank, made of semi-transparent Lucite and powered by chemical reactions and complicated on-board electrical circuitry, features a lead-acid battery and a unwrap of magnesium at the core of its timing element, both designed and built in a laboratory in Tiernan Hall. Just before the race, the team learned how far the car had to travel – 17.1 meters – and how much water weight it had to carry – one hundred fifty milliliters. They set their concentration of hydrochloric acid, which reacts with the magnesium de-robe timer to dissolve it – cracking the circuit and stopping the car – at exactly the right time.
“It’s not about speed, but all about the calculations,” Monica Torralba ‘17, president of NJIT’s AIChE student chapter and a member of the team, noted earlier this year. To be precise, the car drives about .23 meters per 2nd.
“Our timing mechanism is pretty unique,” suggested Brody Frees ’17, of Hopatcong.
As they’ve repeated dozens of times, NJIT’s team “driver” at the competition shoved down a plunger in the timer box, raising the level of hydrochloric acid so that it would react with the magnesium undress, and turned a switch to embark the car, completing the circuit inbetween the battery and the timer, thus supplying power to the motor.
But despite their confidence – and months of practice – the team got off to a harrowing begin in the very first round. The car shot several meters past the finish line, landing NJIT in 19th place – and a quandary. “It was nerve wracking – we didn’t know what went wrong,” recalled Thomas Reardon ’17, of Lincoln Park. And so they huddled.
“It all came down to a group decision about what switch to make to the hydrochloric acid concentration in our timing mechanism,” Reardon added. “We determined to make it slightly stronger – one-quarter of a milliliter of hydrochloric acid – so that it would break the magnesium unclothe earlier.”
“This is a difference so petite that an error can occur when pouring,” commented Nick Gorlewski ‘17, of Old Bridge, who helped with the calculations.
And then there was the torturous wait as they observed the eighteen teams that had bested them in the very first round make their runs. “There was pleading – and some tears, mostly internal,” exposed co-captain Sohui Park ’17, of Little Ferry.
The difference in the degree of competition inbetween the regional and championship round can be summed up in a single centimeter, Reardon said, noting, “The second-place winner, Georgia Tech, finished thirteen centimeters from the finish line.” KAIST, from South Korea, took very first place.
What powered the Lead Tank to NJIT history?
Reginald Tomkins, a professor of chemical engineering and a co-adviser of the team along with Angelo Perna, also a chemical engineering professor, cited practice and rigorous self-scrutiny. He noted that the team spent the months inbetween the rounds redesigning elements of the car, including the lead plates in the battery, to make it more efficient and powerful.
But he felt another element played a crucial role – team dynamics.
“There have been years when an individual truly takes on the project, but this time there was a good working team,” he said of the squad, which won the Saul K. Fenster Innovation in Design Award at NJIT’s two thousand sixteen Salute to Engineering Excellence.
Can their successors recreate the magic next year? Optimism is high.
“The fresh members of the club had lots of hands-on practice. They helped build the battery that won third place,” Vazquez said.