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  #21  
Old 05-10-2013
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Question Re: fuel consumption gas vs diesel

[QUOTE=JohnRPollard;521105]An old thread, but what the heck...

Over the course of 8 seasons, our current 3 cylinder 27hp diesel has consistently burned about 1/3 gph during normal sailboat operations. We push it hard (2700-3000 rpm whenever we're motoring, except when docking and during warm-up/cool down).

Our previous 2 cylinder 18hp diesel burned about 1/4 gph during normal sailboat operations.


Hello, new to your forum...
By "normal sailing operations", did you mean your motor is running to assist your sails, or running alone, under full load???
Is your diesel motor really that efficient?

A dumbfounded gas user.
-Planning to build a fuel efficient trimaran for inter-island travel, Hawaii.
-Mahalos from Maui.

Last edited by bubblerings; 05-10-2013 at 07:45 PM.
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Old 05-10-2013
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Re: fuel consumption gas vs diesel

[quote=bubblerings;1028438]
Quote:
Originally Posted by JohnRPollard View Post
An old thread, but what the heck...

Over the course of 8 seasons, our current 3 cylinder 27hp diesel has consistently burned about 1/3 gph during normal sailboat operations. We push it hard (2700-3000 rpm whenever we're motoring, except when docking and during warm-up/cool down).

Our previous 2 cylinder 18hp diesel burned about 1/4 gph during normal sailboat operations.


Hello, new to your forum...
By "normal sailing operations", did you mean your motor is running to assist your sails, or running alone, under full load???
Is your diesel motor really that efficient?

A dumbfounded gas user.
-Planning to build a fuel efficient trimaran for inter-island travel, Hawaii.
-Mahalos from Maui.
That sounds about normal for gph under power alone. What have you used that was gas powered? Remember sailboats are generally displacement hulls, so you are not talking about speed, likely 7 knots at most depending on length. I don't see inter island travel to be that patient, unless it is for tourists and is a stay aboard. Why spend a whole day when you can get a cheap flight for short money (especially with the kamaaina rates). Now if you are talking typical ferry speeds you will spend a lot more!
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Old 05-11-2013
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Re: fuel consumption gas vs diesel

Quote:
Originally Posted by bubblerings View Post

Hello, new to your forum...
By "normal sailing operations", did you mean your motor is running to assist your sails, or running alone, under full load???
Is your diesel motor really that efficient?

A dumbfounded gas user.
-Planning to build a fuel efficient trimaran for inter-island travel, Hawaii.
-Mahalos from Maui.
Yes, diesels are that efficient. My 3 cylinder 24 h.p. burns about half a gallon per hour running alone under full load:

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Old 05-11-2013
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Re: fuel consumption gas vs diesel

My Perkins 4.108 should burn about 2.5 l/h @2400 revs giving 6.5 knots. When trip planning, I use 3 l/h and a speed of 5 knots, and a max running time of 100 hrs. As I carry 420 litres, my workings should give me a decent safety net.
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Last edited by SimonV; 05-11-2013 at 10:20 AM.
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Re: fuel consumption gas vs diesel

My Yanmar 3GM30F burns 2 liters/hour at 2500RPM, pushing the boat at 5.5 to 6.5 knots, depending on sea state. Does that jibe with other owners of 3GM30F engines?
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Re: fuel consumption gas vs diesel

Thank you, everyone!
I will have to seriously consider a small diesel, now... I had no idea!!!
And, yes I will eventually be sailing, one day.
Up until now, my life revolved around being IN the water... freediving.
I do love ON the ocean, as well... maybe I just won't have a car!
I need a boat more than wheels.
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