Engineering Marvel of the Winter Olympics: A Broom

“We definitely learned a few tricks,” said Marc Kennedy, a member of the Canadian men’s team.

A quick primer on sweeping: It is important. The science behind it is much more complicated than people think. The simplified version is that sweeping slightly increases the temperature of the ice while creating micro-scratches on the surface. The result is that players are better able to control for distance and trajectory as the rock travels down the sheet. The sport hinges on precision, so every brush stroke counts.

But for decades, there have been competing theories about sweeping. One such debate: Is it more important to sweep faster, with a higher stroke rate, or harder, with greater force applied to the ice? And what about body positioning? Do sweepers generate more power by holding the broom upright or at an angle?


Old prototype parts of the SmartBroom are set up in engineer and SmartBroom co-inventor Andrew Flemming’s home workshop.

Ian Willms for The New York Times

These were the types of questions eating at Will Hamilton.

Hamilton was coaching a junior women’s team six years ago and wanted to help his sweepers improve their technique. But he knew there was no clear way to assess how well they were actually doing. It was all guesswork.

Hamilton dreamed of producing data that could be used to solve some of those age-old curling debates. So he zeroed in on Flemming and Fowler, two friends with engineering degrees. Hamilton knew they liked to build stuff for fun. At the time, they were trying to invent a climate-controlled, water-cooled suit jacket.

When Hamilton met with Flemming over beers one night, he pitched a new project: Was there a way to take a pedometer (to measure stroke rate) and a miniature bathroom scale (to measure force) and fuse them to a curling broom?

“So Andrew looks at me like I’m an idiot and says, ‘No, you’d use, like, four sensors and an accelerometer,’ ” Hamilton recalled. “But I could tell that he thought it was interesting.”

Flemming and Fowler were coming to realize that their climate-controlled suit jacket was not about to set the world on fire. (Fowler still has a couple of half-finished prototypes in his closet.) Perhaps they would be better served by focusing on the high-tech broom.

“This has been slightly more successful,” Flemming said.

On a recent afternoon, Flemming joined Fowler and Hamilton on the curling ice here at Westmount Golf and Country Club for a demonstration. They wore matching windbreakers with “SmartBroom: Sweep Better” on the backs.

Each SmartBroom has four sensors in the broom head that relay data to a small display unit. Hamilton took one for a spin down the ice, and the data was instantaneous — line graphs along with a slew of numbers that showed his force in pounds and his stroke rate in hertz. Hamilton also pointed to a figure that he described as his “sweeping performance index,” or S.P.I., a metric that combines power and speed in one easy-to-digest figure.

Patrick Janssen, a world-class curler from Canada, has consistently registered an S.P.I. in the 2,800 range. Fowler provided context.


Each SmartBroom has four sensors in the broom head that relay data to a small display unit showing force in pounds and stroke rate in hertz.

Ian Willms for The New York Times

“As a Thursday night club curler, I’d be happy to get 2,000,” he said.

The numbers by themselves might not mean much, Flemming said, but subtle changes in technique can lead to big differences in the quality of each stroke. And now curlers have that information at their disposal. They can experiment to see which stroke works best for them.

“It’s sometimes tough to convince an athlete that what they’re doing is maybe not the best, because they feel like they’re working really, really hard,” Flemming said. “And it’s probably true that they’re working really, really hard. But they might also be wasting a lot of energy.”

The first SmartBroom was used by Canada before the 2014 Winter Olympics in Sochi, Russia. But at the request of Curling Canada, the country’s national curling federation, Hamilton and his partners agreed not to sell SmartBrooms to other consumers until after the Olympics. Fowler called it a “polite agreement” rooted in relationships with Curling Canada officials.

In Sochi, the Canadian men and women swept gold.

Ahead of the Olympics in Pyeongchang, the gospel of the SmartBroom spread across the globe, and many of the teams competing in South Korea this month are acolytes.

Matt Hamilton, the American curler, said he discovered that he was able to generate greater force by holding the broom more upright. Kennedy, the Canadian curler, said he learned that pressure was more important than stroke rate. So now he sacrifices speed for the sake of power.

“For years,” he said, “we thought it was the other way around.”

Curlers have also used the SmartBroom to assess their physical conditioning. They can compare their statistics from the beginning of a workout to those at the end, or even after several weeks of training.

Will Hamilton declined to say how many SmartBrooms he and his partners have sold, but they are not retiring anytime soon — or even quitting their day jobs. Flemming and Fowler are engineers, and Hamilton works in information technology for a hardware company. The SmartBroom, Hamilton said, is a “side hustle,” albeit a useful one. The broom retails for $3,000. (Canadians get a discount.)

They all hope that more innovations are forthcoming. For example: hardware light enough to embed in brooms used in competition so that real-time statistics can be broadcast on television.

“This,” Flemming said, “is not the end of what we plan to do.”

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