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Old 04-05-2015, 09:49 PM   #101
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Originally Posted by chc View Post
Twin Detroit 8.2L's normal cruise @ 2000rpm = 8-9 kts 10gph. Goes up rom there. High cruise is 23-2400 rpm. 19-21kts; not worried about the fuel at that point
But it sure was fun to get your 34 LRC up to WOT!! Here's a view looking aft at the fastest I've gone on CHC's 34 Cal! I think it was 23 Kts WOT, right Chris?

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Old 04-05-2015, 10:49 PM   #102
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I cruise at 400-500 off the top. *-450 gives me 27 knots on flat, slack water.

It's really tough being in the minority again.
Joining you in the minority here Don with similar speed. I'll worry about fuel consumption if we ever get a larger boat and go serious distance cruising. Until then the option of kicking it in the rear and getting where I want to go is nice.
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Old 04-05-2015, 11:18 PM   #103
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- 4.5 to 5 knots on one engine = 2.75 to 3 nmpg (occasionally utilized in thin canal areas where docks / anchored / moored / small fishing boats abound)

- 6.5 to 7 knots on twins = 1.75 to 2 nmpg (often used in SF Delta - calced hull speed is 7.58 knots)

- 16 to 17 knots on full plane = 1 nmpg (whenever in relatively open water needing/wanting to get some distance covered)

- 21 to 22 knots at WOT = Way Too Much Fuel (used for short bursts when needed)

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Old 04-05-2015, 11:37 PM   #104
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A single FL120 pushes our Taiwanese Tub at 7.5-8knots @ 1800-1900rpm. We have made it go up to 9- 9.5 knots but that is with a clean bottom and WOT. Also have a 4 blade prop if that makes any difference.

Unlike you other fellows, I have no idea what kind of fuel consumption we get any calculations ever done have been pretty rough.
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Old 04-05-2015, 11:58 PM   #105
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Somewhere around 7.5 knots...we tend to run at the same rpm, so speed is sometimes faster or slower depending on currents and wind.
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Old 04-06-2015, 12:11 AM   #106
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I cruise at or just below the 7kt hull speed which is about 2/3 throttle. The boat is overpowered by about 50% so this puts the engine power and speed where Yanmar recommends. Fuel burn is about 1.75gph or 4nmpg. When throttled back to 6.5 kts, the fuel burn is more like 1.25gph or about 5nmpg. My normal cruising grounds are about 25 nm away and I really wish now I had a somewhat faster boat. Having been a sailor most of my life, I thought I would be comfortable at those speeds, but I find that is less and less so.

In contrast, my prior boat was a beautifully restored Donzi 22 Classic which cruised very comfortably at about 45-50 kts, but was much faster. The fuel burn was horrible, but it was stable and fun. It was just a lark though. Maybe that's what wrong with me now, I was seduced by speed. Is there a rehab for this?
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Old 04-06-2015, 12:52 AM   #107
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I cruise at or just below the 7kt hull speed which is about 2/3 throttle. The boat is overpowered by about 50% so this puts the engine power and speed where Yanmar recommends. Fuel burn is about 1.75gph or 4nmpg. When throttled back to 6.5 kts, the fuel burn is more like 1.25gph or about 5nmpg. My normal cruising grounds are about 25 nm away and I really wish now I had a somewhat faster boat. Having been a sailor most of my life, I thought I would be comfortable at those speeds, but I find that is less and less so.

In contrast, my prior boat was a beautifully restored Donzi 22 Classic which cruised very comfortably at about 45-50 kts, but was much faster. The fuel burn was horrible, but it was stable and fun. It was just a lark though. Maybe that's what wrong with me now, I was seduced by speed. Is there a rehab for this?
Get a Tolly 34' tri cabin; does it all - to a good extent. YRMV!
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Old 04-06-2015, 12:57 AM   #108
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5.5knots at 1850 rpm's and .4 GPH. I think that figures out to about 14 mpg :-) Little Yanmar 4JH3 in it with 150 gallons of fuel. Got to love that! 7 knots is 2650 rpm's and 1 gph, and that's faster than the hull really likes. Engine vibration sets my cruising speed and it doesn't like anything between 1850 and 2650 very much.
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Old 04-06-2015, 01:25 AM   #109
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I was seduced by speed. Is there a rehab for this?
Wifey B: Speed...Maybe a fast boat to play around in or a fast woman to play around....with...I was careful there
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Old 04-06-2015, 01:53 AM   #110
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High-speed (greater than hull-speed) is the antithesis of a trawler. Here, a knot below hull-speed:


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Old 04-06-2015, 02:04 AM   #111
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Wifey B: Speed...Maybe a fast boat to play around in or a fast woman to play around....with...I was careful there
Sounds like a great combination . . . I like the way your mind works
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Old 04-06-2015, 06:26 AM   #112
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What's your cruising speed.

Just saw this in Sarasota. This is what we need for fuel economy. Wonder what the GPH is?

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Two 9.9 yamaha 4 strokes. 👍
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Old 04-06-2015, 06:52 PM   #113
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I was once passed by a tow with 15 barges while we were both going upriver.
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Old 04-06-2015, 08:24 PM   #114
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Twin Ford Lehman 120s, 7 knots, 1400 rpm. 1.8 gph total between both engines, though we round up to 2 for fuel consumption calculations...
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Old 04-06-2015, 09:59 PM   #115
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I was once passed by a tow with 15 barges while we were both going upriver.
I got passed by tugs towing logs on my trip up the Inside Passage :-)
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Old 04-06-2015, 11:07 PM   #116
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I got passed by tugs towing logs on my trip up the Inside Passage :-)
Wifey B: I got passed by a snail and a turtle....and the turtle had a broken leg.
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Old 04-06-2015, 11:12 PM   #117
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Tugs towing barges seem threatening to me.



(Carquinez Strait)


(northern San Francisco Bay)

Pushed barges seem to be under control.



(Petaluma River/slough)
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Old 04-07-2015, 08:41 AM   #118
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Depending if

we can get diesel at "reasonable" price for refuelling !

If we navigate at economic speed :

1 engine @ 1500 rpm, speed 7 kts, 0,81lt/1 nm

2 engines @ 1780 rpm, speed 8kts, 1,14lt/ 1nm

And little quicker :

2 engines @ 1850 rpm, speed 9,8 kts, 1,78lt/nm (0,8 edited to 9,8 kts)


Maximum we do , just for this photo 11,6 lts @ 2300 rpm just for the photo
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Old 04-07-2015, 10:21 AM   #119
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At 1000 RPM, 8.6 knots 4.7gph for 2.1mpg. I usually do 1200 RPM (10 knots) and 10gph for 1 nmpg. Fast cruise is 2200 rpm 21 knots 31.6 gph .77 mpg and WOT is 2625 for 27 knots, 46 gph .68 mpg.

For us, this is the best of both worlds. Most times we are at 10 knots or less.
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Old 04-07-2015, 12:08 PM   #120
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We have twin Cats 3208 T/As. Well in the Columbia River we cruise at about 8kts turning the props at 1400 RPMs but she really likes 2100 RPMs which pushed the boat up river at 14kts. Over the course of last year we averaged 6gph and 1.75mpg. I am going to interested what changes when we start cruising the inside passage.
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