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You are comparing apples to swiss cheese. Propellers are made for gearcases (lower units), not cylinders.

Sizing is not universal across manufacturers or even between models. Some models are offered in even pitch sizes, while others are in odd sizes. A prop of the same size from two different models or companies will not perform the same.

There are 4 elements to a propeller: Diameter of the prop, pitch of the blades, number of blades and prop material (aluminum vs stainless steel).

Given the limited information on the late model Johnson 35 (they changed gear case ratios at some point) I would consult a prop guru.

One respected prop source for Boston Whaler owners is Ken at Propgods. He has provided many owners with spot on advice. Tell them we referred you.

http://www.propgods.com/Content2/Defa...fault.aspx