Sorry. I found it on another site. It is 1.79:1. I am buying a new Kiwi three blade feathering prop with "plastic" blades and I just wanted to be sure. Really excited by the prop which I saw at the Vancouver boat show. It only weighs about 8 pounds and is an amazing piece of technology. If you damage a blade, you just take it off and replace it ($100 per blade). Almost zero drag which should be quite a change in light airs after the 3 blade Michigan wheel. I will report back after it is installed.