Here are the USSailing copyrighted polar tables that were created for an Olson 30. It is rumored that these tables are in fact a little slow. Enjoy them now, because if USSailing requests me to take them down, I will have no choice.
There are a couple versions available:
1988 – Page One Tables of Folding Prop
1988 – Page Two Tables of Folding Prop
1988 – Page Three True Diagram of Folding Prop
1988 – Page Four Apparent Diagram of Folding Prop
1993 – Apparent wind graph for a Folding Tractor Prop
1993 – Complete Tables plus Apparent Graph for a Folding Tractor Prop