JoAna
Member
I just want to know what diameter prop and pitch is the most popular in use today.
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
Thanks ours arecurrently 26 x 23 fuel burn @ 2350 RPM is 35 gph and running at 21knots. FYIMine came from the factory with 26 x 26 props. I had them re-worked last year. Changed them to 26 x 25 to get fuel burn numbers more inline. Got close but still not quite there, Next time I have them off will probably change to 26 x 24.5
Your fuel burn is right on the 6CTA curve, so looks like you are propped nicely for your load. Do you cruise at 2350? I stay 2100-2200.Thanks ours arecurrently 26 x 23 fuel burn @ 2350 RPM is 35 gph and running at 21knots. FYI
So how did you determine fuel burn (GPH) with mechanical engines? Having ours for only a few weeks before winter layup I don't know all the systems but I didn't think it was possible without adding fuel flow sensors ...My 2150 RPM burn rate is 28GPH @ 16.5knots. My total travel distance on one tank of fuel is the same. I just get there faster.
At 1200 RPM burns 7gph speed is 9.5knots. FYI my fuel/water tanks are at 50% with fully loaded boat.
I'm swinging 23D x 26P.
Based on my observation, 480CEs usually swing larger diameter props (in a 24" to 26" range). Anytime I hear owners say they swing stuck 26 x 26, I roll my eye in disbelieve on how SR could imagine that just 30 extra HP will swing these props at rated to 450 specs RPMs. Perhaps that's why we hear more dropped valve stories from 480CE owners having overloaded engines. Obviously, swinging 23s on 450s we lose about 2 knots in comparison to 480s with 26s. But, I'm perfectly fine with it knowing that my engines are happy.
I have a 2004 420 SB bought new. I have the 26x23 as well. Had some cupping reduced years ago, because I could barely react 2600 rpm. I also cruise mostly at 2350 which gives me roughly 20 -21 knots depending on the tide.Minor correction on my props. When I purchased the boat it had super heavy cup (0.11). There's a bulletin stating that 450s spec is actually 2700RPMs. When I saw that I was making only touch above 2600, I reduced the cup by 1/2 and that gave me around 50-75RPMs extra.
Point being:
1. 2700RPMs is the accurate spec for 450s. Later on the same recommendation was issued for 480s. See if you can access this link: https://documentcloud.adobe.com/link/track?uri=urn:aaid:scds:US:3574634c-12d2-400c-b61c-d28e2fda7b3e
2. Know the size of your cup as it plays a big role during the tuning process.