There are training foils that are only 50CM long.
The tried and truth length is around 90CM or three feet long.
There is also one that is like 10 or 12 foot tall, but that is more like an experimental unit for world record.
I found the tallest one is 13 feet pulled by a boat, I think in France the world record.
What is the longest one people tried, specific in kiteboarding,
and what are the pros and cons of a longer one
I'm asking since in a case of a unicycle the taller it is,
the easier is to do the idling I'm just thinking.