Ride Performance- CD25 vs CD22
- Thread starter Jeanie P
- Start date
matt_unique
New member
Casey":khcog1c4 said:
Ha ha ha!!
I have yet to prioritize a fuel flow meter but my experience with Napoleon has echoed what other Tomcat owners have posted. Though certainly not directly related to the OP I cruise at 3400 rpm making 22 knots or 25 mph (give or take based on conditions). This results in 1.9 nm/g or 2.2 sm/g.
Interesting discussion on mileage, and of course the original question on the ride of a 22 vs 25 (and 26).
I've owned my boat since new, and have been through many varied conditions, as have others, from zero chop to 3-5 ft and with up to 12 ft rollers. I have twin Yami F80's and permatrims which I use religiously. If ONE pound occurs due to a wave, I either 1) Slow down 1-2 nmph, or 2) Drop the bow a bit with the trim tabs. I don't like pounding, not many do, and I love the ride of my boat in most all conditions except heading into short, steep chop like when the wind and current are opposite, falling off the other side of the wave isn't pleasant! I've also found while boating in the same conditions with other CD22's, I can go 2-4 nmph faster in following seas, about the same heading into the seas.
Oh, and I have my engines set to about -15 deg (with permatrims) when they are bottomed out. Before the permatrims I got my best speed vs rpms with the engines all the way down on the mount, no bolt to stop them, and adjusted the trim with my oversized trim tabs (about 50% larger than factory in 2003).
Another data point on gas mileage. I calculate it with GPS distance divided by filling the tank full over that distance (sometimes takes several trips/distances before I fill it). I have twin engines, slightly heavier than a single, but not much different than a single with a kicker. I also don't have a water heater or marine toilet, so I may be a bit lighter than other CD25's. I get on average, 2.5-2.8 nmpg (nautical), bad conditions 2.2, great conditions 3.0 (very rare). 2-4 people on board, almost always with overnight gear, fresh water, fishing gear, etc.
I've owned my boat since new, and have been through many varied conditions, as have others, from zero chop to 3-5 ft and with up to 12 ft rollers. I have twin Yami F80's and permatrims which I use religiously. If ONE pound occurs due to a wave, I either 1) Slow down 1-2 nmph, or 2) Drop the bow a bit with the trim tabs. I don't like pounding, not many do, and I love the ride of my boat in most all conditions except heading into short, steep chop like when the wind and current are opposite, falling off the other side of the wave isn't pleasant! I've also found while boating in the same conditions with other CD22's, I can go 2-4 nmph faster in following seas, about the same heading into the seas.
Oh, and I have my engines set to about -15 deg (with permatrims) when they are bottomed out. Before the permatrims I got my best speed vs rpms with the engines all the way down on the mount, no bolt to stop them, and adjusted the trim with my oversized trim tabs (about 50% larger than factory in 2003).
Another data point on gas mileage. I calculate it with GPS distance divided by filling the tank full over that distance (sometimes takes several trips/distances before I fill it). I have twin engines, slightly heavier than a single, but not much different than a single with a kicker. I also don't have a water heater or marine toilet, so I may be a bit lighter than other CD25's. I get on average, 2.5-2.8 nmpg (nautical), bad conditions 2.2, great conditions 3.0 (very rare). 2-4 people on board, almost always with overnight gear, fresh water, fishing gear, etc.
I just downloaded the PDF of the 25 specifications from the C-Dory factory website. A quote from page two of that file:
"Economical cruise ranges from 12 - 20 MPH at well over 5 MPG."
The document is "© Fluid Marine LLC." Like most of the folks who have posted here, we get somewhere around 2.5-3 MPG when running from 12-20. I can manage 5 MPG at displacement speed, but not at planing speeds.
Just a heads-up on real world performance vs claims.
Best wishes,
Jim B.
http://www.c-dory.com/boats/classic/cruiser-25/25' Cruiser.pdf
"Economical cruise ranges from 12 - 20 MPH at well over 5 MPG."
The document is "© Fluid Marine LLC." Like most of the folks who have posted here, we get somewhere around 2.5-3 MPG when running from 12-20. I can manage 5 MPG at displacement speed, but not at planing speeds.
Just a heads-up on real world performance vs claims.
Best wishes,
Jim B.
http://www.c-dory.com/boats/classic/cruiser-25/25' Cruiser.pdf
T.R. Bauer
New member
Wow!!!!
That is all I can really say to people that are fighting, arguing, and discusssing gas mileage that sucks so bad. Some of you are acting like 4-5 mpg is good......really??? All of our boats drink gas and we all know it. Surely there are worse boats, but come on, no matter how you slice it, this is terrible mileage.....
Tim
That is all I can really say to people that are fighting, arguing, and discusssing gas mileage that sucks so bad. Some of you are acting like 4-5 mpg is good......really??? All of our boats drink gas and we all know it. Surely there are worse boats, but come on, no matter how you slice it, this is terrible mileage.....
Tim
I have one of the Northstar (Navman clone) low end meters that I use to tell me how much gas I have used and how much is left in the tank. It is pretty accurate in that regard, and that is why I have it. I rarely concern myself with the GPH reading because I know I get 2 mpg average over a 100 gallon tankful every time so it doesn't matter all that much how much I am using at any given moment. But then, I never take any trips where fuel isn't available if needed for long stretches, so the small percentage of cost I may save is not worth fretting over ideal performance. I always try for an ideal ride and speed combination, with the emphasis on the best speed for the engine RPM, which probably lends itself to the best economy, as well.
So, back to the original question, I think the 25 rides a whole bunch better than the 22 would in the same conditions, but at a cost of fuel economy.
The next big question in the Seattle area is how much smoother will the ride be with that Pete Carroll hotshot at the helm?
So, back to the original question, I think the 25 rides a whole bunch better than the 22 would in the same conditions, but at a cost of fuel economy.
The next big question in the Seattle area is how much smoother will the ride be with that Pete Carroll hotshot at the helm?
Matt Gurnsey
New member
I think the 5mpg may be data from the 22, because the data sheet with a 150 on the 25 shows the best mpg at just over 4 at 3500 mpg. Of course this is a lightly loaded boat on a calm day.
In fact all of the published fuel economy numbers are lightly loaded boats, so real world numbers will be lower. The value of the published fuel data is to compare the various models against each other.
In fact all of the published fuel economy numbers are lightly loaded boats, so real world numbers will be lower. The value of the published fuel data is to compare the various models against each other.
T.R. Bauer":1r98yuuh said:
I'd say it's all in the perspective... compared to a Prius, the mileage is lousy. Compared to any other 25 foot cabin boat running at 15-20 knots, it's pretty good. Then, I'm also assuming the Prius will only plane for a few seconds, depending on the speed and angle when it hits the water. :twisted:
Terrible mileage? It's a boat. Physics applies. If I could get 4-5 MPG at a high cruise speed, I'd be so happy I'd wet myself. 8)
Best wishes,
Jim B.
Yeah, but it planes easily - at least the hydro variety. Worst car I've ever driven for that.
But instead of 4-6 mpg, it gets 46. Probably 50 if I really tried, but the biggest savings are in town driving slow, and I try to get through town quick so nobody sees me driving the dorky thing.
TyBoo":142muy3h said:
If I were going to have a car again (probably will someday :wink: ), the Prius, or Honda Civic hybrid would be a close second to a Porsche. I'm thinking it would be uncomfortable living in the Porsche (married guy observation), so the Prius is probably more practical and would allow me to still live at home. To keep this on-topic, none of those three cars ride as well on the water as the CD-25... just guessing at that. (Name the movie this quote comes from: after pulling the 928 out of the water, "Who's the U-boat commander?" :twisted: )
Best wishes,
Jim
JamesTXSD":35w0fz32 said:
:note :note Just take those old records off the shelf... :note :note
Now the Prius has a fuel management system. If the boat had one like that I wouldn't have time to fish.
Back on subject, the big Buick I used to have rode a lot better than the Toyota, but at the expense of economy. On the other hand, the even bigger Dodge 1-ton rides pretty rough, although it doesn't get pushed around as much in the chop.
(PS - "There is no substitute.")<<All of our boats drink gas and we all know it. Surely there are worse boats, but come on, no matter how you slice it, this is terrible mileage.....>>
Yeah I feel really bad about that but I have these handy carbon credits in my pocket, you see. I'm really quite green, you know.
<<Terrible mileage? It's a boat. Physics applies. >>
Therein applies the theory of relativity. Mr. Green is a big believer in relativity.
Yeah I feel really bad about that but I have these handy carbon credits in my pocket, you see. I'm really quite green, you know.
<<Terrible mileage? It's a boat. Physics applies. >>
Therein applies the theory of relativity. Mr. Green is a big believer in relativity.