[C320-list] Question for Designer Douglas

[esquirecatering at rcn.com]

In this month's issue of the Mainsheet in the C350 technical section Designer Dogulas says that folding props are or primary importance for racers and in light wind.

Question:  For a 320, assuming good sails, good trim, and a clean bottom, what is the wind speed that eliminates the affect of a folding or feathering prop?  In other words, what is the minimum wind speed that a folding prop won't make a difference on a C320.