Antique Four Blade Gardner Propeller ID Help

[Dlouise]

We found a propeller in my grandmas house and we’re wondering if anyone would be able to provide further details on it. We love it and are very interested in its history! Any help is appreciated!
Manufacturer: Gardner Propellers in Forest Park, IL
D.E.S. 2081
Serial No. 43944
Length= 59 inches
Blade Width= 9 1/4 inches
6D750ABE-CDAD-40AA-8C57-CFC636728346.jpeg

[Mtskull]

Rather than a propeller intended for flight, that has all the characteristics of a test club, i.e. a propeller that is designed to impose a load on an engine being bench-tested.

[Dbahnson]

Rather than a propeller intended for flight, that has all the characteristics of a test club, i.e. a propeller that is designed to impose a load on an engine being bench-tested.

Agreed. Test clubs have the unusual characteristic of a constant angle rather than a constant pitch along its blade length. That makes the test club very inefficient with respect to propulsion but works well in creating both resistance and efficient engine cooling.