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Old 08-27-2012, 12:28 PM   #21
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I hear a lot of people talking about staying close to shore.

It won't save you.

Any trip that requires time spent in the ocean needs to be taken as if you were crossing an ocean.

You gotta watch the weather.

Sd
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Old 08-27-2012, 12:33 PM   #22
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400-500 miles between fuel stops wouldn't be a problem. San Diego to Turtle Bay, MX to Cabo San Lucas. Those would be the 2 longest stretches in MX. Then no problem all the way to Panama. After Panama on the Caribbean side it's not a problem with some planning. Capt. Pat Rains has a cruising guide for this area that was just updated:

Captains Pat & John Rains
Thanks very much!

I have the boat, now I need to get retired so I have the time.
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Old 08-27-2012, 01:01 PM   #23
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I think you previous owner was like mine.....

If you have a 120 or 135 Lehman...I would expect quite a bit over 2.0 gal/hr.

My 135 chart (which I have right in front of me) says almost 3 gal/hr and I know that to be trus as I ran the boat to NJ from Ft Lauderdales at around 8 knots (2000-2200) as the PO said 8 knot cruise and I was getting very poor milage compared to what I thought. After some fuel ups I knew that the consumption was 3-4 gal/hr. So my chart is in lockstep with my engine...and a 120 can't be that much different.

Here's another guys experience and I would say he's high on the curve (poor eng performance maybe?)

34' marine trader 1973 120hp ford lehman 2.3-2.6gph at 8 mph @1650 rpm


Here's another close to my curve...

1978 49 DeFever RPH 68,000lbs wet, twin 120 lehmans nap, @1700 rpm 7.3 kts fuel burn 4 gal/hr

He's close to my chart at 2gal/hr at 1700 RPM, my chart for the 135 says he should be slight;y under 2.0 gal/hr per engine
We have the SP135 and cruise 400 plus hours per year. I calculated our annual average speed which is anchor to anchor and gallons per hour (plus a bunch of other meaningless numbers). I have a 4 year average of 6.3 knots at 1.7 gallons per hour. We displace 44,000 lbs with a 37 foot water line and run with paravanes which cost us between 1/2 and 3/4 of a knot. Our sweet spot on the engine is 1600 to 1800 rpms and adjust the rpms for sea conditions.
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Old 08-27-2012, 02:50 PM   #24
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"With any boat, you would do best avoid genuine heavy weather offshore. "

Unquestionably , but the perhaps 300% premium for a blue water boat will probably keep you alive.

On most sailboats its simply a matter of going hove to.

Harder to do in a motor boat with huge windage and huge thin windows, and a deck house that is of unknown robustness.

YRMV
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Old 08-27-2012, 08:30 PM   #25
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FWIW, when we bought our boat our friend who until his recent retirement was the head of the engineering department of Alaska Diesel Electric (today's Northern Lights/Lugger) gave me a formula for estimating the fuel consumption based on engine horsepower. He said that the Lehman 120 develops about 60 hp at 1600 rpm. Therefore---

Fuel Consumption Formula
1 gallon per hour per 20 horsepower.
1600 rpm = 60 hp
60 hp = 3 gallons
2 engines @ 3 gph each = 6 gph total @ 1600 rpm
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Old 08-28-2012, 12:09 AM   #26
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My lehman does burn 2.3 at 1800 but backed down to 1500 and burnt 1.7 gph Slowing down helps a ton
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Old 08-28-2012, 05:27 AM   #27
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"1 gallon per hour per 20 horsepower."

Perhaps a bit optomistic with such an old design and light loads , 16-18 may be closer.
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Old 08-28-2012, 07:21 AM   #28
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My lehman does burn 2.3 at 1800 but backed down to 1500 and burnt 1.7 gph Slowing down helps a ton
Actual measurements?

If you don't mind me asking how you did the measurements?

Your numbers seem close to the performance charts I have but about 0.3 gal/hr higher...which model? Age/hrs??

Thank you.
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Old 08-28-2012, 11:58 PM   #29
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Back to the time issue. The 2 year time frame that was suggested is a pretty good estimate for a round trip. I would give myself at least 9 to 12 months to get from Seattle to the Canal. We took a month to leisurely transit from San Francisco to San Diego and then a little over a week getting from San Diego to Cabo with stops in Ensenada (fuel available), Turtle Bay (fuel available), Bahia Santa Maria (no fuel) and then on to Cabo, and then a couple of days getting from Cabo to La Paz.

The Sea of Cortez is a must and I would give it at least a month, preferably two to explore and enjoy. You can easily spend 4 or 5 months cruising down through Mexico and then into Central America. The nice thing is that (especially in Mexico) you can find nice Marinas where you can leave your boat and return home for a while.

Being in Seattle you can easily get on a Dockwise ship in Nanimo and have you boat shipped to La Paz if you want to save time but it's not cheap. We got a quote of just under $25,000 for a 50 Ft. Trawler for the trip from La Paz to Namimo - I believe they also ship to Costa Rica and then proceed on to Ft. Lauderdale but you'd be missing the Sea of Cortez and the west coast of Mexico which in my opinion is the best part of the trip.
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Old 08-29-2012, 12:11 AM   #30
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Im thinking im gonna get the boat to
Texas and jump in the gulf... Seen most the westcoast already so no need to waste time! I want tropical! Belize big blue hole
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Old 08-29-2012, 12:44 AM   #31
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"1 gallon per hour per 20 horsepower."

Perhaps a bit optomistic with such an old design and light loads , 16-18 may be closer.
You'll have to take that up with Dick. He's only been in the marine diesel business for some 45 years so probably doesn't know what he's talking about.
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Old 09-07-2012, 06:05 PM   #32
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Big Duck's week on Lake Powell:
171 water miles,
82 engine gallons,
40 generator gallons,
30 engine hours,
7 days 6 nights on the water,
0 days at marinas.
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Old 09-07-2012, 08:41 PM   #33
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John Deere says my 4045 engine consumes 4.5 gallons to generate 80 horsepower. That equals 17.8 horsepower per gallon.
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Old 09-08-2012, 06:10 AM   #34
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Instead of guessing one method to have a better idea might be a tow rope and a scale to find the drag at a variety of speeds.

Everybody has a pal with a bigger boat.

It is simply amazing how little effort is required to move at SL of 1

Most impressive tow job I have been aboard for was in Key West.

Daddy lobster boat captain (40+ft) shifted into reverse to quickly (no shaft brake) and spun off the prop.

His kid came out ,(identical boat) hooked up and towed us back to port

ON THE PLANE!
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Old 09-08-2012, 02:06 PM   #35
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Marin,
What your Northern Lights friend said may not reflect what he knows or what reality is. He usually deals w very modern stuff and may not have made the effort to adjust his conversation to your old engines. So not to hijack this thread about distance any further I've started a new thread "Gallons per hp hour".
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