Motoring range for a 34' with 3GM35F - SailNet Community

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  #1  
Old 07-13-2011
Mondofromredondo
 
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Motoring range for a 34' with 3GM35F

Hi all,

I'm always reminding myself to take note of the distances I've clocked while motoring and correlate it with fuel burn but I always forget as I'm too excited just to get out on the boat.

Has anyone calculated the range per tank or distance per gallon?

Obviously this would vary from boat / motor combo and conditions.

But I'm looking for a number that would give me a general idea based upon my PSC 34 and 3gm35f in calm conditions at around 2500 RPM. I have a 35 gallon tank with a 3 blade prop as well.

I've noticed that my fuel tank barely drops when I motor 20 miles to Catalina and 20 back. Very fuel miserly.

Thanks to all !!!!
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Old 07-13-2011
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My last boat was 34' and 13,000 lb displacement. We had a 3GM30 and motored at about the same RPM as you do. We used app. 6/10 ths of a gallon per hour and made about 6 knots with an Autoprop. We used .75 gph for planning purposes. Your 35 would burn a bit more I would guess.
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Old 07-13-2011
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I keep fairly detailed records and figure I burn .75 gph in my 34 with a 3HM35F. I can't get exact because of occasional running the engine at anchor for the refrigeration and use of the espar heater, but I think that is pretty close. I cruise at 2500-2700 rpm.
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Old 07-13-2011
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I have a 3YM30 in my 36 footer (12,000 lbs.), and sometimes have to motor to get to Catalina. I think I calculated somewhere just over 0.5 gallons an hour at around 2500.
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Old 07-13-2011
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We have the 3HM35F engine in our 34 and burn .5 gallons an hour on average running between 2200-2500 RPM on a 3 blade 17" Max Prop. Remember the tank shape will not give a good indication of fuel level on the guage due to the V shape. Once it gets to 1/2 tank, it drops pretty fast.

John S
PSC 34 #201
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Old 07-13-2011
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We have a 3H35F in our 34 PSC. We average 0.59 g/h with our e blade Max Prop.

FYI: On a long windless trip across the Gulf of Maine a few years ago I ran the engine 2500 - 2600 and saw fuel consumption go way up. I asked Nigel Calder about this and he suggested that if you want to stretch your tank, drop to a lower RPM. Obviously it will take more time but your fuel consumption will go way down.

Bob S
PSC 34 Alaria
Christmas Cove, Maine
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Old 07-14-2011
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Graph of fuel gauge reading vs. fuel in gallons for PS34

http://pacificseacraftowners.org/boa.../file.php?id=6
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Old 07-14-2011
Mondofromredondo
 
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Thanks to all

Sure is nice being able to ask the crowd a question and get so many good answers. Sounds to me like .6 to .7 gph is a reasonable number to use.

Thanks to Bob for the nice graph showing the tank actual volumes when reading the fuel guage. Good idea to print this off and keep a copy on board.
Bob my PSC is also a 1988

Thanks
Keith
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Old 07-14-2011
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Keith

I don't know if it matters but the graph Bob sent was for a 1992 PSC 34. Morning Call is now Alaria (my boat).

I'm curious if others also find their PSC 34s only hold 28 gallons and not the advertised 32 g.

Bob
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Old 07-15-2011
Lou Ann
 
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Fuel gauge

Hi, I have a 1987 34, #68.

Does anyone have a graph for the standard size fuel tank?

Lou Ann
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