Spinnaker chute or spinnaker sail johnson boat works D scow.
I have a old school chute sail or spinnaker sail from a johnson boat works D Scow white bear lake Mn. Blue and white colors and sailed on lake calhoun Mn back in the days. This sail is in great shape, was utilized on a johnson D boat originally, then a C and lastly a Melges M20, case your not familiar those are scows. I just liked to go fast and break stuff, or maybe it was more fixing things I liked. Anyhow there she blows and could be yours to fit your vessel. Maybe build yourself a ice boat