Create Helm [Spelljammer]

By casting this spell on a normal chair or other seat, this spell transforms that chair or seat into a Spelljammer Helm suitable for powering a Spelljamming ship. The Helm this spell creates provides a Helm rating of 1:3, similar to a Minor Helm. If this Helm is dispelled, the chair or other seat used for the Material component of this spell is destroyed.

You can Create a permanent Helm by casting this spell on the same seat-like object every day for one year. You don't need use the Helm this spell creates when you cast the spell this way.