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27 Mar 2010

The 2628 racer, changes

That won't be it's name, but it does say what it should be. There'll be a real name by the time it turned out to be a good bike. It does look like it'll be a good one. The design has undergone some important changes since the race in Sloten. Changes have been made on several aspects.

The shape of the frame was changed to lower the aerodynamic drag, especially around the wheels.
I went for a non-integrated seat. An integrated seat looks better and gives a stiffer and lighter frame, but does demand an adjustable boom or bottom bracket. That's a difficult part the built for a first-timer without specialist tools. I could ofcourse let someone else do that. But that's not homebuilding and does make things expensive.

I've also learned more about how the use carbon fibre. With this knowledge I've come closer to a reliable bike that does what it should, go fast and be fun to ride. If I keep the design simple, keep an open mind and do things step by step, it will work. There are a few places in the design that allow afterwards changes. I can adjust the headtube angle by adapting the rear dropouts, or by mounting a 26" wheel.

The geometry has also been worked out, sort of. Tests have shown that a seat angle of less than 20 degrees does give an advantage. Twenty degrees was long time considered to be the limit. By most people it still is. But you need to try new things if you want to go faster. The Nadir showed that lower than 20 degreed does give an advantage. I had a short talk about this with David, one of the guys that designed the Nadir. The only uncertain factor in the design is the rider. Maybe the engine (I) does not like such a laid back seat angle. Another good reason the go for the separate seat design. 

I'll order all the frame materials next month. Exciting, isn't it?

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