2020 G23 Prop

[greggmck]

you broke your prop shaft on a 2020 G23????

and you stating reductions in RPMs result in MORE fuel burn? NOT consistent with anything I have seen or anyone else. I’ve been through 12-14 OJ props on Gs.

RPM reductions = less fuel burn 100% of the time

No I did not have a prop shaft failure on my 2020. I did these measurements in 2018 on my 2018 G23.

RPM reduction = less fuel burn 100% of the time is not correct. Yes I am stating that at lower RPMs I measured greater fuel consumption. RPMs alone do not define fuel burn. The ECU will enrichen the fuel-air mixture to generate additional power when required. Turning the 17 1/2 x 17 1/2 prop resulted in lower engine RPM to achieve the same speed in a surfing configuration compared to the 17 x 17. However, to push the same hull, in the same configuration, to the same speed at lower RPM the engine HAD to increase its horsepower by burning a greater amount of fuel.

[greggmck]

Ok, we had 4 adults and 4 kids in the boat. 800 lbs of lead. Another 200 lbs of misc stuff. 25mph empty was 3700 RPM and 11.5 full was 3300 RPM.

This RPM looks ideal, about 200 RPM less than the 17" x 17" and 100 RPM better than the 17.5" x 17.5" which should improve the fuel flow issues I measured with that one. Thanks for sharing!

[abstron]

this is an older thread but I just bought a 2022 G21 and am in higher elevation and the stock 3433 with ZZ6 took forever to get on plane with 4 adults and full ballast, surfing full ballast and 4 adults at 11.5 was 3800 rpm's so looking at a new prop and 3629 seems recommended on acme site, any updates to share with the 3629? wrut