Welcome to the board ! I dont have an Eyra but I do have the 18 foot Sabre with a 175 Optimax. I just bolted on a 25″ Fury to replace my 26″Tempest. The reason I changed is I wanted a prop to handle loads as the 26 Tempest worked great with just me in the boat but when a load was put to it, I would lose 3 mph. I have had my boat up to almost 70 in the winter time and rpms were right at the limiter. As soon as I planed out and got up to speed with the Fury, I hit the rev limiter pretty quick. I was @just over 68 mph GPS. I still think the 25 Fury will be the best prop for a 18 foot /175 combo as the handling, hole-shot and mid-range acceleration are AWESOME. If my engine would spin up to 6k, theres no doubt this would be the fastest prop for my combo.