quote:I hope to do something similar.
While Johnny's flaps do allow air to pass through at speed, perhaps his initial problem was the closeness of the shroud to the core.
When the flex-a-lite is mounted directly to the rear of the core, air passing through the core into the shroud area has VERY little turning room. It hits the back of the shroud after maybe just 3/4" of travel. sort of like that air hitting a brick wall. NOT conducive to good flow.
Nancy Haney of PCNC added a metal shroud to her flex-a-lite fans that placed the fans about 2" further from the core. Now that air has nearly 3" of wiggle room, which surely allows a more unrestricted flow.
Jack DeRyke (Bosswrench, and Nancy's father-in-law) took it one step further and made his from aluminum and built a wooden buck to hammer-form the corners from a squared-off corner at the core to the rounded corner of the shroud. Jack never keeps things simple.
Larry
Here's a shot of Nancy's
