If the child were not present in the kayak, ballast would need to be placed where the child was so that the boat would trim properly. The only other way I can think of is a sliding seat for the adult that can be locked into different positions.

Another major concern is boat width. My experiences with children in narrow boats have taught me that wide is good. Children love to shift side to side which makes the adult constantly adjust their position to keep primary stability. Most tandem boats are much wider. If you went with a 17-18 foot boat in the 28”+ width range, it will lag behind other single kayaks.

: That is an interesting idea. If the front hatch( kiddie kockpit ) were added,
: then would the regular cockpit need repositioning aft due to the
: additional weight, balance? And if so, what would be the result of NOT
: having the front hatch being used?

: Rehd