bicycles

forget-aerobars:-ars-tries-out-an-entire-aerobike

Forget aerobars: Ars tries out an entire aerobike

Here comes a future —

Taking to the road in a modern, high-speed version of a 40-year-old dream.

Image of a aerodynamic recumbent bicycle parked in front of a pickup truck.

Enlarge / The Velomobile Bülk, with its hood in place. Note the hood has an anti-fog covering on the visor (which is flipped up). The two bumps near the front of the hood are there to improve clearance for the cyclist’s knees.

JOHN TIMMER

My brain registered that I was clearly cycling. My feet were clipped in to pedals, my legs were turning crank arms, and the arms were linked via a chain to one of the wheels. But pretty much everything else about the experience felt wrong on a fundamental, almost disturbing level.

I could produce a long list of everything my mind was struggling to deal with, but two things stand out as I think back on the experience. The first is that, with the exception of my face, I didn’t feel the air flow over me as the machine surged forward down a slight slope. The second, related to the first, is that there was no indication that the surge would ever tail off if I didn’t hit the brakes.

Living the dream

My visit with a velomobile was, in some ways, a chance to reconnect with a childhood dream. I’ve always had a fascination with vehicles that don’t require fuel, like bicycles and sailboats. And during my childhood, the popular press was filled with stories about people setting human-powered speed records by putting aerodynamic fiberglass shells on recumbent bicycles. In the wake of the 1970s oil crises, I imagined a time when the roads might be filled with people cycling these pods for their commutes or covering long distances thanks to a cooler filled with drinks and snacks tucked in the back of the shell.

But the pods seemed to vanish from public consciousness as I got older, and I also learned that recumbent bikes are absolutely terrible on hills, which I’m now fond of climbing. The dreams had faded from my awareness when a reader, in response to one of our e-bike reviews, suggested I check out a velomobile. It turns out that my dreams weren’t dead; they had just relocated to Europe without mentioning it to me.

Marc Rosen and two of his velomobiles. The newer model, the Bülk, is closer to him.

Enlarge / Marc Rosen and two of his velomobiles. The newer model, the Bülk, is closer to him.

John Timmer

Velomobiles are a product category with a variety of designs and manufacturers producing them, most of them based in Europe. They’re also the fiberglass pods of my youth updated to current standards. Gone is the weight of fiberglass, and the one-off, hand-made hardware has been replaced by standardized models that have gone through refinements across generations. Safety features like lights, directionals, and mirrors are now standard.

But the prices, while not exorbitant (mostly in the $8,000–$10,000 range—for bicycles; you can pay more for far less carbon fiber), mean that living my childhood dream really wasn’t an option. The European Union-based companies don’t seem to have any agreements with US bike shops that would let me check one out in a showroom; I’ve heard of only two dealers in the US that keep velomobiles in stock, and neither is anywhere close to me. Fortunately, that didn’t preclude the option of trying one. One major vendor of velomobiles, Romania’s Velomobile World, has an ambassadors program, where people agree to let potential buyers take test rides in return for a discount on purchases.

That’s how I found myself setting out for a short spin near the Maryland-Pennsylvania border in a Velomobile Bülk owned by Marc Rosen, who also fielded a lot of my questions about the hardware.

Forget aerobars: Ars tries out an entire aerobike Read More »

raspberry-pi-powered-ai-bike-light-detects-cars,-alerts-bikers-to-bad-drivers

Raspberry Pi-powered AI bike light detects cars, alerts bikers to bad drivers

Group ride —

Data from multiple Copilot devices could be used for road safety improvements.

Copilot mounted to the rear of a road bike

Velo AI

Whether or not autonomous vehicles ever work out, the effort put into using small cameras and machine-learning algorithms to detect cars could pay off big for an unexpected group: cyclists.

Velo AI is a firm cofounded by Clark Haynes and Micol Marchetti-Bowick, both PhDs with backgrounds in robotics, movement prediction, and Uber’s (since sold-off) autonomous vehicle work. Copilot, which started as a “pandemic passion project” for Haynes, is essentially car-focused artificial intelligence and machine learning stuffed into a Raspberry Pi Compute Module 4 and boxed up in a bike-friendly size and shape.

A look into the computer vision of the Copilot.

While car-detecting devices exist for bikes, including the Garmin Varia, they’re largely radar-based. That means they can’t distinguish between vehicles of different sizes and only know that something is approaching you, not, for example, how much space it will allow when passing.

Copilot purports to do a lot more:

  • Identify cars, bikes, and pedestrians
  • Alert riders audibly about cars “Following,” “Approaching,” and “Overtaking”
  • Issue visual warning to drivers who are approaching too close or too fast
  • Send visual notifications and a simplified rear road view to an optional paired smartphone
  • Record 1080p video and tag “close calls” and “incidents” from your phone

At 330 grams, with five hours of optimal battery life (and USB-C recharging), it’s not for the aero-obsessed rider or super-long-distance rider. And at $400, it might not speak to the most casual and infrequent cyclist. But it’s an intriguing piece of kit, especially for those who already have, or considered, a Garmin or similar action camera for watching their back. What if a camera could do more than just show you the car after you’re already endangered by it?

Copilot's computer vision can alert riders to cars that are

Copilot’s computer vision can alert riders to cars that are “Following,” “Approaching,” and “Overtaking.”

Velo AI

The Velo team detailed some of their building process for the official Raspberry Pi blog. The Compute Module 4 powers the core system and lights, while a custom Hailo AI co-processor helps with the neural networks and computer vision. An Arducam camera provides the vision and recording.

Beyond individual safety, the Velo AI team hopes that data from Copilots can feed into larger-scale road safety improvements. The team told the Pi blog that they’re starting a partnership with Pittsburgh, seeding Copilots to regular bike commuters and analyzing the aggregate data for potential infrastructure upgrades.

The Copilot is available for sale now and shipping, according to Velo AI. A December 2023 pre-order sold out.

Raspberry Pi-powered AI bike light detects cars, alerts bikers to bad drivers Read More »