slowrotor,
This page has been revised.
Shrouded Propeller
A couple of the previous NACA reports were found.
Also included is the search on NACA for "Shrouded Propeller"
Hope this helps.
Dave
________________
PS
We're going to get banned from this forum, since we are both currently working on winged craft.
Here is my project;
VTOL - AeroVantage - 1x2 Overview
D