Re: Force prop
It's not the size of the blades that limits you, it is the hub diameter. The gearcase on Force engines is only 4 inches and only Force props OR small gearcase Mercury props will fit--unless you want to do some modifications.
Yeah, if you research and look at prop stock/part numbers on replacable hub props, you will find some Honda-Yammy-Suzy props might fit. But here, you need to do your homework.
Unless you are willing to do modifications, stick with the 13 1/4 inch diameter props. Your Force really won't like other sizes.