[wwilson]

Silmaril,

Can you share where the 0.1-kt differential came from? I''m familiar with a now pretty old evaluation done by MIT that concluded there was no meaningful difference in drag between a broad set of props that included both folders and featherers. The 0.1-kt figure you offer is the first time I''ve seen a difference quantified. Is that from test, modeling or anecdotal?

Wayne