*THE HULL TRUTH is the world's largest FREE network for the discussion of Boating & Fishing. Whether you're researching a new boat, or are a seasoned Captain, you'll find The Hull Truth Boating & Fishing Message Forum contains a wealth of information from Boaters and Sportfishermen around the world.
Welcome to the updated THT!
If you are having trouble signing in, please email feedback@thehulltruth.com with your username and we will help you. We thank you for your patience as we help you access the new site!
Random Quote: No Ma'm were not drunk anymore....were just stupid
5500 rpm = 55 mph.... I dont look at the burn rate at wot
What props and engine height are you running. My 2005 26 classic with F225's at 4200 RPM is only 32 MPH. Also at 6000 RPM my top end is 50 MPH. I am running 19 pitch rev 4's and have the engines mounted in the second highest setting. Even with my original 21 pitch yamaha props my top end was only about 52 MPH very light.
Maclin
2008 38 Fountain Sportfish Cruiser with twin Cummins Mercruiser sterndrive diesels (QSD4.2) with Bravo III outdrives - Cruise 41 mph @ 24gph (approx. 1.8 mpg). WOT is 52 mph. Range at cruise is about 600 miles.
You two guys in the fountains just are not playing fair!! LOL. 85mph in a fishing boat!!
I have been told I can get more speed by changing props, but I am not sure I really want to. I am pretty happy with the way it runs now. With heavier props will I gain fuel economy too at cuise? Or will the engines have to work harder to push the boat at cruise? I have never been one to start changing props around on anything, but I might consider this one. Thanks.
31TE Fountain: // 5650rpm 65mph 23p three blade . Best cruse is 38 mph at 1.2 mpg. I have the older EFI;s. Twin flow scans.
Hydra Sports 21 Bay // 5400rpm 55 mph 21P three blade. Best cruse is 40mph at 4.3 mpg Navman fuel meter.
What props and engine height are you running. My 2005 26 classic with F225's at 4200 RPM is only 32 MPH. Also at 6000 RPM my top end is 50 MPH. I am running 19 pitch rev 4's and have the engines mounted in the second highest setting. Even with my original 21 pitch yamaha props my top end was only about 52 MPH very light.
Maclin
Stock props... Will check height again but I think they are mounted like yours.... You will lose top end with 19's so no big deal - but you should cruise a bit better......
Now if your talking full Bahamas fishing load - then yes - I run between 30 and 35 mph getting 1.3 mpg.... But regular load (3 guys 1/2 tank) then my numbers are what I get.....
What type of props did you have? I think it may be a weight issue? My WA is propably a little heavier?
But when I went out on sunday the tachs didn't go past 5k, no matter how I trimed the motors.
Anyone else have a Mako with twin 135s, just curious to see if anyone elses numbers are higher.
Quote:
Originally Posted by Ris-K
I used to have a pair of 150 opti on a 26 foot CC, yes you should be getting more RPM than 5000. Those motors per Mercury should be up to 5600 WOT? You might want to give the Mercury guys a call??
