Some biophysics

As our example tours show, we did drive many touristy rides with our trikes and quads.  As soon as we were outside of asphalt roads, we never met a recumbent. That we were slower than cyclists has bothered us little. Day trips from 50 to 200 km absolved well. The hand drive was always used and made a lot of things first possible.
In the following, we want to illustrate what the additional hand drive makes possible both during pure mechanical viewing (mechanics) and in a complex driving test.