Irwin 28 Winch Size?

[eugenesdream24]

I'm doing some research to eventually upgrade my winches. Does anyone have any idea the diameter of the base of my Irwin 28 winches, or just an easy trick to measure.

Any winch recommendations, ideas, preferences - especially for a 28-30 foot Irwin would be greatly appreciated.

 

[mainesail]

Winch size is developed from sail loading and line size-info is out there--start with max loading of biggest sail.