Kim Kronslev is a danish mechanical engineer who has designed and built his own motorbike, around a KTM 640 LC4 single. The chassis and the swingarm are steel tube multitubular structures, fully triangulated. The bike was computer designed using CAD software. I think he has done a great job.
This is how the bike looks nowadays. As you can see, the CAD model and the real bike match perfectly. It is clear that Kim Kronslev is a meticulous guy.
During the design process, Kim performed around 25 FEA analysis, studing different triangulation and tube size combinations. Vibrations was one of the main concerns during the design, and finally there are not problems in this aspect, and right now the only part that vibrates is the exhaust silencer.
The bike has been running 1500 km. on tracks till now, without having any problem. At the beginning the suspensions were WP, but it seems that they didn’t perform properly, so finally he decided to change to Ohlins and from that moment on, everything was perfect.
Kim wanted to make his bike street legal, but the Danish autorities are very strict and there were some problems, so he dismissed the idea and right now he uses the bike just for track days. The bike is almost finished, Kim wants to spend his free time during this winter building a seat and a small fairing..
[tags]kim kronslev, prototype, ktm 640 LC4, single, trellis, multitubular[/tags]