Imagining a Motor To Fool The Cheats
Designing a Power Supply
First we had to look at current technology and battery systems to see if this was even feasible. We knew that the cheats would want a system that didn't need a bottle or saddle bag that could be easily spotted by commissaires or fellow competitors so we had to come up with a system that was completely hidden.
We soon realised that getting a battery to fit into the small part of a bicycle frame was going to be a tall order. The most cost effective batteries that get used in everything from electronic cigarettes to Tesla cars are the 18650 battery specification. The provide 3.7 volts and in theory can provide up to 9mah of power. This isn't enough so you'd need a quite a few of them to get any decent combination of power and charge. We settled on four, in series, in the seat tube part of the frame and four in the seatpost. We'd address the Di2 issue later.
Designing a Motor
We had seen the pictures of units in the aftermath of the Belgian cyclo cross affair and realised these were simple enough to concoct. We approached Chinese factories for motor pricing and dimensions and realised that theoretically all that would need to be added is a planetary gear system and a gear spline to go over the bottom bracket axle.
Showing the Concept
We approached a highly respected 3d games modeler and described the system to him. In the absence of us being able to photograph a product that we never really want to exist we realised that a working animation was going to be the best we could use to display the principle.