Thru pre-projects that have been made earlier, especially technical innovation task of dampening system in autumn 2011, we have decided to use a single-sided swing arm for Roskva. With a design like that we are given the opportunity to place the driveshaft inside the swing arm, thus protecting it from the environment. Some manufactures uses this design, but the weight of the swing arm gets quite high. We wish to improve this design by the use of carbon fiber and a strong new design.

There are some challenges with the use of carbon fiber, i.e. there are little or none useful material data accessible, and only a few people who have experience with this material.

By the use of an accelerometer and His Majesty The King’s Guards’ drill hall, we did a test drive with a borrowed motorcycle, to get data on the forces acting on the swing arm. With these data we can design the swing arm against fatigue fracture and make a model of the damper setup.

The suspension is based on a linkage system, where the top and bottom section of the damper is mounted to the swing arm, and not the frame as the conventional way. By doing this we gain more space around the electrical motor, and the swing arm can be given an aero dynamical form. By the use of the linkage system we will easily be able to adjust the damper setup to the given driving conditions.

The swing arm design is currently under reconstruction, and we will post pictures of it as soon as it is finished.