Your cruising speed?

Aurelia":374o0h4a said:
If we were not always constrained by time, we would cruise at precisely 4.8 knots in our 19. We do travel at this speed for short periods and enjoy the quiet and calm but steady pace. But.... our goals are always stretching our schedule for now so we settle in at 16 knots at 4800rpm much of the time. With a really heavy load that may be closer to 12 knots just to keep the rpms below 5k.

Greg

That is with a Carbed Honda 75 and 13 3/4 x 13" 4 blade aluminum prop. We also have a similar prop the is 15" pitch but it doesn't deal with our heavier loads quite as effortlessly
 
1tuberider
That brings me to a question. We get wakes even in the relatively safe ICW. Is it better to take the wake head on? Should the speed be a slow as possible, fast or somewhere in between. Possibly a little sideways of the wave coming at you? For the most part it seems cutting the throttle seems to have the least impact.
 
Hi Stan
It depends on a lot. Probably passengers and mission and hull design but in my angler

I usually quarter them at a reduced speed so I don't pound. I hate pounding. If you have trim adjustments I would want the bow down.

Wakes are different than ocean swells. They can be steep and short
so the head on approach with way will have you pounding multiple times unless your at displacement speeds. By quartering you are reducing the steepness on both the front and back of it as you go over. So you can have more speed but if the wake is off a ship I would slow down to displacement speed and maybe run along with the swell (not quartering) to reduce the tossing effect.

If the wake is breaking I would go head on and back off throttle once on top but maintain enough way to keep from getting sucked back. I am thinking of surf zone not open ocean white caps. I dodge white caps when caught in them and at this point I am usually heading home. I also never go in a surf zone unless I am surfing which is my true passion. Tomorrow's forecast is for 10 ft swell at 14 sec and north wind. It could be really good. No place for a boat.

Some of the brats will have great answers on this because they have lots of experience. But this is my approach on the angler.
 
85 MPH @ 2300 RPM and 25 MPG in the Genesis 5.0...at 6800 RPM redline not sure what the speed would be in 8th gear, but it would be excessive.
What Rogerbum posted for the TC 255.
Cheers!
John
 
Boating mosly in the San Juan Islands we like to cruise at a speed that is at least planning (somewhere around 14 knots). Inevitably the boat wants to go faster if the conditions are right and try as we might we usually end up going faster. Our 22 with a Honda 90 feels best at 18-22 knots and always runs better if heavily loaded.
 
My take on this: the numbers don't matter.

If highest fuel mpg are really that important to you,
maybe you should have a sailbote instead of a
recreational power boat. Even then, the wind is free
but sails are not.

What makes sense to me is to adjust cruise speed
to passenger comfort (sea state), the purpose of the voyage
and the weather (existing and forecast).

Aye.
 
I'm a 16 Cruiser and my speed is just a matter of "Set & Setting". Calm summer day low 90's.... 20mph 4700 rpm, if squall comes up, 10 mph keep the bow trimmed down the boat just slices thru the chop. Total white out due to rain fog etc Idles speed, read the instruments and bring all my senses to their sharpest. Just love being on the boat , it is my passion. Nothing to look at "Haul Ass", things to look at explore, "Slow down & soake it in".
 
I'm a 16 Cruiser and my speed is just a matter of "Set & Setting". Calm summer day low 90's.... 20mph 4700 rpm, if squall comes up, 10 mph keep the bow trimmed down the boat just slices thru the chop. Total white out due to rain fog etc Idles speed, read the instruments and bring all my senses to their sharpest. Just love being on the boat , it is my passion. Nothing to look at "Haul Ass", things to look at explore, "Slow down & soake it in".
 
We have a cc23 with a f-115 Yamaha weight about 4000lb boat ,engine and boat stuff. We have found the CC-23 Venture will cruise about 4-5 knots faster then our CD -22 that we had .I think the extra weight and deeper V 5-6 degrees vs.2-3 are the answers.
No wake zones 1200rpm 3-4 knots

slow speed zones 2000rpm 5-6knots

regular cruise 4600-4800rpm about 20-21 knots

This all depends on sea conditions when keeping up with Cruise club we put trim tabs down engine tucked in and do about 4800rpm and 19-20 knots I usually follow a 50ft Sea Ray or similar boat size We are one of the smaller boats in Cruise club.
 
We run Carpy (C-22 twin Honda 40's) generally at 2 speeds. Hull speed is about 6 mph and we can do that on one engine at about 2000 rpms. We are almost always heavily loaded. On plane, we run 4000-4500 rpms and get 12-16 mph.
Fuel economy is about 6 mpg slow and over 4 mpg fast.
I wonder about my props as I can't get over 5000 rpms? I might need more pitch?
Carpy
Bruce & Joyce
 
bcassal":ggp4ggm3 said:
...
I wonder about my props as I can't get over 5000 rpms? I might need more pitch?
Carpy
Bruce & Joyce

You need less pitch. And if you're usually heavily loaded, you should probably change props. Check you manual, but I think you are at the very lower limit of what your WOT RPM should be.
 
We cruise our CD22 (twins) with only one motor in the water and burning 1 gallon per hour on the gauge. Not even sure what speed that is but it varies by conditions. Our other speed is generally WOT and only at the end of a long day cruising or a need to beat the weather.

We love to sit back and relax - but love to go fast when we get ready to "be there now". On our trawler (Sundowner Tug) the only option was to sit back and relax - sometimes we didn't have the patience to do so.
 
BRAZO":11e9yig6 said:
We cruise our CD22 (twins) with only one motor in the water and burning 1 gallon per hour on the gauge. Not even sure what speed that is but it varies by conditions. Our other speed is generally WOT and only at the end of a long day cruising or a need to beat the weather.

We love to sit back and relax - but love to go fast when we get ready to "be there now". On our trawler (Sundowner Tug) the only option was to sit back and relax - sometimes we didn't have the patience to do so.

Robert, My cruising speeds seem to match yours closely. (Also, my affinity for the Sundowner's, maybe.) I see you are running Honda 50 EFI twins. I am wondering where you are getting your fuel flow data from. Do you have FlowScan, or is your info coming to the plotter or instrumentation from the OB's via NMEA ? My interest is if it is FlowScan, how accurate do you think it is, as in have you checked the info in any other way.

Thank you.

Harvey
SleepyC :moon

JC_Lately_SleepyC_Flat_Blue_055.highlight.jpg
 
hardee":18ndg4tv said:
I am wondering where you are getting your fuel flow data from. Do you have FlowScan, or is your info coming to the plotter or instrumentation from the OB's via NMEA ? My interest is if it is FlowScan, how accurate do you think it is, as in have you checked the info in any other way.

Hi Harvey,

We have a Honda Digital Speedometer. It'll show the fuel usage on the Port engine, Starboard engine, or combined. It'll also show the mpg if the speedometer on the engine works correctly and that engine is in the water. Almost always just use the gallons per hour. It is very nice knowing exactly how much fuel we are burning - sometimes it is just a tad slower and it'll save quite a bit of fuel.

http://www.boats.net/parts/detail/honda/H-06373-ZY3-800.html

The data is coming digitally from the Honda 50 EFI, so it is 100% (or as close as can be).

We loved our Sundowner - but not the size (unable to trailer) or the extensive teak inside and out. We had a 32ft with 12ft beam - walk around decks, Cummins 210hp, Onan generator, inverter, etc - completely decked out when we bought it. So, we went from complex systems to easy breezy CD22 - very good choice. The total cost of the Sundowner compared to our CD22 (purchased new) is almost the same - doesn't see like a fair trade, but we would never go back.

Let me know if I can help any more on the Honda Digital Speedometer.

Robert
 
Thanks Robert. I have Yamaha 40's carbed, no info from the OB's. One of the reasons I have considered going to a re-power with EFI 50's. The 40's are too low a fuel rate for FlowScan, and no out put to NMEA for that.

Thanks again,

Harvey
SleepyC :moon

0_CD_Cover_SlpyC_with_Classics_MBSP_2009_289.thumb.jpg
 
Bruce,
You should be able to get 6000 RPM--that is what I get with the Honda 90, and at that RPM, and the boat light, I get just under 30 statute Miles per hour.

What are the pitch of your props? You will want to drop the pitch of the props, not increase them. Generally each inch of decrease or increase of pitch will either increase or decrease the engine speed by 200 RPM. Thus usually one goes up or down by 2 inches of pitch. in your case, I would drop the pitch 2".

For example, if you are running a 17" pitch prop currently; get 5000 RpM, and then drop the pitch 2" to 15" prop, you should get about 5400 RpM. Some prop shops will let you try props, until you get the best fit. There are more than one item which will vary--such as amount of cup and rake, as well as the pitch-number of blades, material etc all enter into the factors.
 
My 22 goes 30MPH at WOT (5600 rpm) when loaded for 2 night trips, two people, no water in tank, 1/3 fuel.

This is on a BF90D with a 13.5x15 prop at about 500' alt.
 
Cliff
What is the pitch on your propeller? I went from an 11 down to a 10 and improved speed yesterday coming back from St. Augustine to a max of 21 MPH with the wind and current pushing me. RPM's were about 5640. Thinking of dropping to a 9 pitch?
 
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