Here is what he wrote:
Recently my son, daughter-in-law and I sailed with two trimarans to a beach, had a swim and went back.
The water mouse is as fast as the triple B with little wind. With more wind, the triple B accelerates better and faster.
The shore trailer of the water mouse was insufficiently stable. From two old bed frames I welded a cart that carries the trimaran under the beams. That’s quite an improvement that lowered the threshold to use this boat.
All together a lot of fun with making and sailing.