I'm hoping someone with the same rig will share their prop experience.
I just bought a 2005 G3 Eagle 175 with 90 HP Yamaha Four Stroke. It has a 15 pitch Yamaha aluminum prop and at WOT it's turning 6,200 rpm and speed seems slow to me, so it appears to be underpropped.
GPS speeds -- 6,200 rpm 36 mph (that's WOT, didn't leave it there but a couple seconds, felt the rev limiter kicking in); 6,000 - 33 mph; 5,000 - 29 mph; 4,000 - 20 mph It planes out from stop in 2 1/2 - 3 seconds.
Based on the "200 rpm per inch" rule of thumb, theoretically I can go to a 17 pitch and expect 6,000 rpm WOT, or 19 pitch for 5,800 rpms. And Yamaha says max operating range is 5,000 to 6,000.
I don't need a high performance prop, I'll probably replace it with aluminum. I'll have to order a prop online, any best guesses on whether to go up to 17? ..... or up to 19?? I'm guessing 17.
Thanks,
Jim