See above, and this video below.
Ice Yachting - The fun and fear of 100kph
Feb 22, 2019
Capable of more than four times the wind speed a DN ice yacht can reach 100kph and in a fleet of 50 boats the closing speeds are both alarming and intoxicating.
https://www.youtube.com/watch?v=PE8mCZOmrEo&ab_channel=TheWorldSailingShow
Worked for a guy in the 70s who was a champion on those and was in Sports Illustrated.