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Old 07-24-2011, 01:53 PM   #1
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Fuel Usage--Ford Lehman 120

We have completed the first half of our summer cruise* from La Conner to* SE Alaska.
Here are some numbers re fuel consumption, engine hours, and speeds.

Total Miles traveled---792
Engine Hours---139
* (Includes idle/warm up, anchoring, and pulling anchor.
Gallons used---255 USG
Gallons per hour---1.83
Average speed in knots per engine hour---5.7
Nautical miles per US gallon---3.1

Fuel cost after refueling in Ketchikan, AK---$4.40/gal* (Includes some Canadian fuel).

Boat--Puget Trawler 37, semi-displacement, 25,000lbs, new bottom paint & prop tune--4-2011
Engine---Single Ford Lehman 120HP
Normal operating speed---6.5 to 7.0 knots 1600 to 1800 RPM (approx)

Larry H



-- Edited by Larry H on Sunday 24th of July 2011 02:24:52 PM


-- Edited by Larry H on Tuesday 26th of July 2011 11:49:21 PM
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Old 07-24-2011, 02:14 PM   #2
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RE: Fuel Usage--Ford Lehman 120

Thanks Larry for the useful info.
That is about the size and HP I am looking for in a trawler.
Nice record keeping.
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Old 07-25-2011, 05:02 AM   #3
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RE: Fuel Usage--Ford Lehman 120

-Puget Trawler 37, semi-displacement, 25,000lbs,

By rule of thumb, sq rt of LWL is under 6 ,times 1.15 so the speed is about 6,9K still water is about right .

25,000 divided by 2240 is 11 tons times 2,5 or 3 hp per ton is 27,5 to 33 hp required max .

33 hp divided by 18( optomistic HP per gallon) is 1.833 ,, 27 divided by a more realistic 15 (hp/gal) is the same.


so simple Rules of thumb can get one an idea of what the performance would be.
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Old 07-25-2011, 06:40 AM   #4
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RE: Fuel Usage--Ford Lehman 120

The best my 120 gets on my 34' mt is 2.3gph Now I am wondering if my injectors need serviceing
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Old 07-25-2011, 07:27 AM   #5
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RE: Fuel Usage--Ford Lehman 120

Probably not, I suspect it is just you are traveling at nearer the full hull speed in your 34 footer more of the time, (ie 1.34 x sq root waterline length in feet, = ~ 7kn), whereas Larry's 37 footer was dawdling along at below full hull speed (ie 1.15 x above = ~ 6.5kn, as FF calc'd), most of the time, with a significant fuel saving. Getting that extra knot of hull speed does add quite a bit to fuel consumption, and that's before you start semi-planing.
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Old 07-25-2011, 07:48 AM   #6
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RE: Fuel Usage--Ford Lehman 120

peteb
thanks Yes there is little difference in speed from a cruise rpm of 1650 to max of 2150 I have put over 1500hrs on my old 120 and have had burn rate vary from 2.7 to 2.2gph I guess water conditions and current
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Old 07-25-2011, 09:18 AM   #7
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Fuel Usage--Ford Lehman 120

My 120 Lehman *is closer to 1.5/1.75 gal per hour at 1700/1750 rpm


-- Edited by jleonard on Monday 25th of July 2011 09:19:25 AM
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Old 07-26-2011, 06:32 PM   #8
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Fuel Usage--Ford Lehman 120

Quote:
Larry H wrote:
Gallons used---255 USG
-- Edited by Larry H on Sunday 24th of July 2011 02:24:52 PM
You're doing the trip in the wrong boat :-)* Good friends of our spent five months four years ago cruising from Bellingham, WA*to SE Alaska and back.* They went as far north as Juneau and spent lots of time meandering around in SE.* Total gallons of fuel used for the entire trip- 185.** Cruise speed was 6 knots.

The boat was a 30' Newport sloop.* And before you say, "well, they were able to sail," they put the sails up exactly one time for a few hours on one day of that five months.* The rest of the time they were under power.

But seriously that's impressive fuel economy that you've been getting.* Our GB (twin FL120s) burns 5-6 gph for a cruise speed of 8 knots.


-- Edited by Marin on Tuesday 26th of July 2011 06:33:18 PM
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Old 07-26-2011, 11:47 PM   #9
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RE: Fuel Usage--Ford Lehman 120

But it was a 30 foot sailboat! I, at least, have room to swing a cat, (and bring half of the house with me) (Admirals demand. LOL) I sure envy those sailboaters getting to stand out in the sun and rain and wear all that cool fowl weather gear, not!!

This years fuel economy is better than last years. The only difference is a new bottom job and prop service this spring.

Larry H
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Old 07-27-2011, 04:46 AM   #10
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RE: Fuel Usage--Ford Lehman 120

I sure envy those sailboaters getting to stand out in the sun and rain and wear all that cool fowl weather gear, not!!

Thats why they invented motorsailors.

Today a true 90/90 can be had,

90% the ability of a "pure" sailboat sans engine performance,

90% of the displacement offshore power boat distance and comfort .

Biggest hassle is there as expensive as any offshore boat , about 300% more than a coastal crawler ,
and are more modest in interior room until they get to about 60 ft.

If your galley or head needs to Echo, probably not for you!
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Old 07-27-2011, 12:24 PM   #11
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Fuel Usage--Ford Lehman 120

Quote:
Larry H wrote:
But it was a 30 foot sailboat! ....I sure envy those sailboaters getting to stand out in the sun and rain and wear all that cool fowl weather gear, not!!

You'll get no argument from me on that regard.* While I really like sailboats and have crewed on them in Hawaii and here, the main reason we bought a powerboat is that we've spent all this time flying the PNW islands, BC, the Inside Passage, and SE Alaska looking down on all the boats and virtually all the sailboats are under power.* So our reasoning was that if we're going to be motoring along anyway we'd rather sit in a cabin with big windows so we can see everything (one of the main reasons we got a boat in the first place) rather than either being down in a hole with small windows or in an exposed or semi-exposed cockpit.

BUT.....* the economy of a sailboat allows one to take trips that might not be affordable in a power cruiser.* For example the couple with the Newport are retired on a relatively fixed income that is not huge.* Being able to go to SE Alaska on a five month cruise and burn only 185 gallons was a not-insignificant factor in their decision to do the trip.

But the most impressive thing to me is that this couple with their old sailboat actually made the trip. And made it successfully with no real problems to speak of.* As opposed to most boaters up here who talk big about going to Desolation Sound or the Broughtons or up the passage to SE Alaska but never do it.* So points to this couple (and you) for actually doing what they said they were going to do.

We've taken several cruises with this couple and their boat "La Mouette" ("The Gull").* I took the photo below as we were running from Rebecca Spit to Comox on the Strait of Georgia.* It was one of just two times on the three week cruise that the wind, the current, and the direction we wanted to go all lined up the right way for them so they could use the sails instead of the motor.* But I would have to say that, given the choice between cruising up the Passage to SE Alaska and back in a sailboat like this or not doing it at all, I'll be more than happy to take the sailboat, wind or no wind :-)







-- Edited by Marin on Wednesday 27th of July 2011 12:28:11 PM
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Old 07-27-2011, 06:06 PM   #12
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Fuel Usage--Ford Lehman 120

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-- Edited by JohnP on Wednesday 27th of July 2011 06:09:22 PM


-- Edited by JohnP on Tuesday 9th of August 2011 04:38:15 PM
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