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Choke size?

Original poster: "Steve Studer" <reddykguy@xxxxxxxxxxx>

Does anyone know of a formula for calculating the inductance of a choke with an iron core? I have 4 chokes the size of large mot's they have about 30 turns of .250" flat copper wire. I cannot seem to find any formulas except for air core formulas. I would like to use two of these for a DC resonant power supply. I just don't have any idea what the inductance might be.