This 6-foot long ski-tug (Wasserskischleppgerät) was produced in Hamburg, Germany for the leisure market in Europe and was quite popular in the day. It was first introduced in late 1962. This one is from 1964. It is powered by an NSU 150 cc Type 61 single-rotory Wankel engine. The 24hp engine was the first large-scale production of a rotary. Here is a link to a video about this SkiCraft.
We like this because of the very unique Wankel rotary engine. We never tried it on a lake or bay before we sold it.