clean machine question

jimbo36 · Post by **jimbo36** » Sat Feb 13, 2010 8:05 am

The Bertram is only 3" wider but, if the specs on the ads are correct, it weighs 7000 lbs more. Could this be right? I know the Berts are beefy but that is a big differance! Jimbo36

foofer b · Post by **foofer b** » Sat Feb 13, 2010 8:35 am

I believe you are right, Jimbo. I looked at a 28' Bertram and was astounded at the weight.

Post by **BeaconMarineBob** » Sun Feb 14, 2010 4:02 pm

The clean machine F 30 was the fastest F boat Trojan made. With Chrysler 318 her cruise speed was 30 mph and toped out over 35 mph

prowlersfish · Post by **prowlersfish** » Sun Feb 14, 2010 5:34 pm

Bob not to argue but that may have been trojans speccs but in the real world mine with 351 mercs never saw 30 knots ,27 max a friend with one with the 318s was slighty slower , when he changed over to 454 then he got 35 knots at the top . Now this is with the normal gear one would carry not in show room trim (no gear)

BTW good to see you on here

jimbo36 · Post by **jimbo36** » Sun Feb 14, 2010 8:35 pm

seems to me I have read that speed tests done in fresh water vs salt water are differant. Faster results in salt water. Opinions?

prowlersfish · Post by **prowlersfish** » Sun Feb 14, 2010 10:40 pm

jimbo36 wrote:seems to me I have read that speed tests done in fresh water vs salt water are differant. Faster results in salt water. Opinions?

Some else posted that speeds where faster in fresh water a few days ago , I belive by something like 3 mph ? I not sure what type water is faster , I will bet its much less then 1 mph . ( maybe tenths ) .

http://www.newton.dep.anl.gov/askasci/g ... n06300.htm

jimbo36 · Post by **jimbo36** » Mon Feb 15, 2010 9:04 am

prowlerfish, I think it is salt water due to the buoyancy issue. Boats sit higher in salt water so when underway have less hull in the water. Less hull wetted surface=less drag=faster boat?? Jimbo36

Jersdevil · Post by **Jersdevil** » Mon Feb 15, 2010 10:45 am

My F30 will do 24 knots at 3300 RPM in the Cheasapeake. I have Twin 228 HP, 305's. I do not run her that fast normally, at 2900 - 3000 RPM she will do 18 knots.

Dan Faith · Post by **Dan Faith** » Mon Feb 15, 2010 3:41 pm

Prowlerfish,
Bob has listed MPH you are talking Knots with the conversion your numbers coincide. I have a 30 sport fisherman and get every bit of what bob is quoting. One of the best hp to weight boats I have ever owned, the boat really surprised me the first time I hit WOT. Also very economical to operate.

prowlersfish · Post by **prowlersfish** » Mon Feb 15, 2010 7:28 pm

Dan, mine never did that good . BTW I always think knots with boats , but no matter the clean machine is one sweet boat

prowlersfish · Post by **prowlersfish** » Mon Feb 15, 2010 7:33 pm

jimbo36 wrote:prowlerfish, I think it is salt water due to the buoyancy issue. Boats sit higher in salt water so when underway have less hull in the water. Less hull wetted surface=less drag=faster boat?? Jimbo36

Thats The way I read it but I have heard the arguments go both ways on speed but I don't think its a big difference but I do belive salt has the edge