Cleaning out junk, found a Three Bladed Adjustable Fan, box has rotted away, but fan adjustment nuts paint unbroken, as is rest of fan, pretty pristine. My question is, does it work? As a young man, we ran T's on the place with and without fans, even one with multiple blades (Parade Fan?) Majority of those vehicles were stripped down and sans radiator caps, just kept pouring water in. Anybody ever run one of these, and is the blade angle trial and error, or what?

Curious fan. Got any pics ??

Adjustable as in "reversible" like some Caterpillar heavy equipment (retired operator) did for summer/winter configuration ?