Rock The Bike: BLOG

Thanks Bicycle Music Festival Fans, Crew, and Bands for a fantastic Road to BMF opener

Feb 10, 2010Posted by fossilfool

Update from Austin’s first Pedal Powered spin class

Jan 20, 2010Posted by fossilfool

Rock The Bike is helping Pure Austin Fitness pedal power their spin class. Pure already owns two of our Fender Blender Pros, and the goal of the current project is to convert these bike blenders to pedal power generators using our latest technology, then use them to pedal power the audio in their spin class. Here are some shots from the work I did in Austin over the past five days.

On Friday I met up with Pure Austin’s Beto Boggiano at his workshop. We chopped off the dropouts on the Fender Blender Pro frames, in order to respace them for the new generator hubs.

We used the generator hub itself to position the dropouts at the correct width, rather than, say, measuring the distance with a caliper and then holding the dropouts with a pair of vice grips.  The gym mats and wood are to lift the hub and hold it at the correct position for tacking.

Here’s a shot of the inside of our generator hub. The copper coils move past rare earth magnets that are bonded to the inside of the aluminum hub shell, creating an electric charge that makes current flow through a cross-bridge rectifier. From the Wikipedia page on generators:

A generator forces electric charges to move through an external electrical circuit, but it does not create electricity or charge, which is already present in the wire of its windings. It is somewhat analogous to a water pump, which creates a flow of water but does not create the water inside. The source of mechanical energy may be a reciprocating or turbine steam engine, water falling through a turbine or waterwheel, an internal combustion engine, a wind turbine, a handcrank, compressed air or any other source of mechanical energy.

Above: Beto tacking the dropouts back on in their new position.

After welding the dropouts back to the frame at the correct width, it was time to rebuild wheels around the new hubs. The rim and tire add mass that creates a flywheel, smoothing out the pedal power. Plus, with a tire back on, the tire-rubbing bike blender interface will still completely functional (though optional). Pure Austin will be able to rotate the blender’s roller away from the tire during the spin class (to minimize noise and power loss), and then move it back to crank out smoothies for the cyclists after the class.

Before the trip, Rock The Bike’s engineer Leif had encouraged me to build the wheels ahead of time so that I could devote my time to installing the system once in Austin. Unfortunately I ran out of time preparing for Austin and instead brought rims and spokes with me. I ran into a number of issues. In the photo above, note the spoke nipples poking way out of the rim. I’d built up the wheel as a one cross when the spokes were spec’ed for a two-cross pattern.

Fortunately, these missteps and delays gave me a chance to bike around Austin on a bright blue Mundo and meet several cool salesmen and mechanics at Bicycle Sport Shop, Austin Bikes, and Mellow Jonny’s. I was impressed how much people in Austin already knew about the Mundo and its development, considering there are only a few Mundo riders there. I got stopped in front of bars for test rides and one rider even flagged me down… “Is that a Mundo?” It’s amazing how well educated and networked bike people can be about the products they buy.

The Monday 6PM spin class came and went without Pedal Power. I did get to see Beto, the gym’s owner and most experienced spin coach in action, which was great. The big black box on the floor between the palm tree and the instructor’s podium is a digitally powered JBL PRX subwoofer. The main speakers are mounted to the ceiling. You can see one of them at the top of this image just right of center. The mains are powered by two rack-mounted amplifiers, out of view. Hopefully we’ll be able to Pedal Power both the amps and sub. But we won’t know until we try.

Above: Bob Farr, an old-school Austin Xtracycle rider, and pedicabber, showed up Monday for the Pedal Power Workshop at Pure Austin. The technical delays described above limited our ability to fill the sweaty gym air with solder fumes at the workshop, but I was able to show Bob lots of good data and parts on paper and on Pure’s public iMac. The next day Bob showed up to help me bust out the last few details of installing the generator wheels. Here Bob is pedal powering 80 watts of LED lighting, a successful test of the Electric FB Pro.

Above: tracing a round object to mark a cut in the wheel covers, making room for the larger hub.

We succeeded in electrifying both of Pure’s Fender Blender Pros. The next step on the project is to build them a Pedal Power Utility Box. I would have liked to have the triumph of a pedal powered spin class, but at least we finished the primary goal of converting the two FB Pros they had, and I won’t have to fly back to Austin to complete the project.

Pure will have time to thoroughly test the system before using it at their fitness expo, March 6.

LiveOnBike Performance by the Genie

Jan 13, 2010Posted by fossilfool

The Road to BMF

Jan 13, 2010Posted by fossilfool

Fantastic pedal power social dynamics in the BBC’s powering-a-house experiment

Jan 12, 2010Posted by fossilfool

I love how the pedalers get grossed out as they see the father of the house preparing to take a shower. It’s always cool when you can let the pedalers get the best seat in the house at a music event or let them in on a secret.  At Rock The Bike’s Pedal Powered Stage events, we serve up smoothies to the pedalers, bike blended of course. We’re thinking of putting the pedalers on a raised stage and lighting them at our Feb. 5th event.

The other moment that’s just classic about this video is when people continue running into the room to add more power and bring the system voltage back to the green. At first, they’re wearing the nice uniform: red jersey and cycling shorts. But as the system voltage continues to get clobbered by the energy hogging electric shower, the producers themselves run into the room wearing street clothes.

And you gotta love the cheering from the crowd when they successfully bring the voltage back from the brink.

A hot shower is, of course, one of the hardest things you can possibly pedal power. Apparently it takes 70 people to do so, (approximately 6000 watts!) Music is just the opposite. 1 person pedaling can get generate about 50-80 PDW (people dancing wildly), reminiscent of how an ant can carry 50 times its own weight in food.

Why is music so efficient? Is it just a coincidence that pedal powering music is easier than pedal powering lighting (even LED lighting), projecting a movie, or cranking out a smoothie, in terms of the number of people who can enjoy one person’s effort?

I think not. Think back to the ancient roots of music: drumming in the Savannah of Africa or the plains of North America that would bring people from a wide distance to gather at the fire. Music and dancing may be a cosmic gift of our evolution, a tool for humans to form communities, and therefore better band together, meet challenges, and fight external threats. This is the theory put forward by Barbara Ehrenreich in her book “Dancing In The Streets: A History of Collective Joy”

Thanks Urban School!

Jan 9, 2010Posted by fossilfool

We had a blast last night at the Urban School, pedal powering their first dance of 2010. Thanks to Lucy, Lucas, Catherine and all the students and teachers.

As with any Rock The Bike event, we invite people at the event to pedal. The kid in the foreground is pedaling the Choprical Fish, which is powering the lighting at the dance.

Justin’s pedaling the Mundo 1000 during the sound check, one of our two bikes equipped with our Grasshopper generator system.

Despite their abundance of energy for gogo dancing and freaking, the Urban School students were a bit hesitant about joining in the pedal power effort. I felt good that we had shown up with a 6 person crew, including Adam, Masha, Hugh, Justin, and Ally.  But we were doing 90% of the pedaling. Normally, the GP (general public) does more like 40-50% of the pedaling. I tried pulling students in and there were a few cool students who kept pitching. But honestly the freaking on the dance floor was so prolific, that it was obvious that’s where their minds were. So after a while, I stopped walking out into the crowd using a Down Low Glow like an airport landing guide, and just pedaled. I thought back to David Butcher and how he holds it down at festivals, pedaling away on the Prime Mover. I found new time trial position I liked on the Fender Blender Pro, and entered a crank, sprint, lactic acid! cycle. Out of saddle sprint! Lactic acid. Two students get on, both girls. I adjust the seat for one of them and the indicator on our inverter already drops into the red.

“Pedal hard! Go for it. ”

I look around for crew and don’t see any one. The LED is floating in the red, occasionally hitting blinking red. I know I’m going to need to save this party. I hate having to be intense with the pedal power coaching, but I was yelling, “Pedal, Pedal, Pedal!” every time I saw that blinking light. I was trying to get in a hamstring stretch, but I kept having to coach the girls on the bikes. And my communication with the DJ wasn’t to the point where I could make eye contact with him. He was killing it anyway, and I liked the fact that we were driving the PRX hard. Screw the stretch. I tap out with one of the girl and go into another sprint on the FB Pro.

Justin’s back! The other girl taps out and we bring the LED back to orange, and green. It was kind of like that all night. Three electrics would have helped, but really we just needed more from the students. I think some type of introduction would have helped. The students probably didn’t know what the function of the pedal power bikes was, other than to climb all over them and have a blast. No, they knew, but the hormones were too strong. Freaking trumped!

Rock The Bike has left the building.

We only brought one of our PRX speakers this time. The other is in the shop on a pedal power integration project.

See more photos from the night on Flickr.

Both Sunday Streets and Maker Faire post their dates for 2010

Jan 8, 2010Posted by fossilfool

Hosting Pedal Power workshop at Pure Austin Fitness Jan 18, plus Thursday Night Social Ride 1/14

Jan 8, 2010Posted by fossilfool

Chicago has a long, tall history of innovation in the field of tandem tall bikes

Jan 8, 2010Posted by fossilfool

New Year’s Eve at Sera Phi

Dec 31, 2009Posted by fossilfool